Archive of Our Own ^beta

Chapter Text

The rain poured down heavily, drops of water tapping against the windows with a low but cold atmosphere that filled the silences between dialogue on screen.

William stretches his hand slightly on the sofa, hand hovering above the remote as he heard the door opening. There was a sudden shift in the room, he didn't bat an eye at the man coming in, sometimes Mark could be a little tired from his fights or missions. This time Mark was angrier than usual, as well as his scent getting stronger.

Mark had already changed out of his suit and quickly curled into the couch with a blanket slung low and loose over his hips, his eyes half lidded and tired from the afternoon patrol. He wasn't trying too hard with his touches as he buried himself on William's arm, and William could confidentially tell the difference of shift in the air this time. He’d been slouchier than usual, slow in a way that had nothing to do with exhaustion and everything to do with instinct, his heat's coming. 

Will drew his eye to trail down Mark's back as he shifted beside him, not-so-accidentally letting his hand brush against Mark’s thigh as he reached for popcorn. “You always take up half of the blanket,” he murmured.

Mark didn’t move away. If anything, he leaned a little closer, head tilting to rest against William’s shoulder with a soft sigh, his thighs pressing close together and his chest pressed on Will's arm. “I didn’t hear you complain last time,” he said, voice gone a little too soft for his usual self, eyes darting off to the TV screen.

William’s nose slightly scrunched, the faint scent was subtle, but not nothing. Like warm sugar and ozone, layered with something deeper, hormonal and not quite dangerous but definitely a warning for him. Mark’s scent was changing, and his body knew it before his brain wanted to admit it.

He tried to focus on the movie, clinging on to the other and sighed. “…You okay?” he asked finally, voice low.

Mark made a sound like a purr, humming through his nose. “Mhm.” his brows furrowed and dragged the blanket loosely. 

“That doesn’t sound like an 'okay' to me.”

There was a pause, long enough to feel deliberate. Then, slowly, Mark turned his face toward William’s neck, nuzzling without shame, his breath warm and comforting. “You smell nice.”

William’s heart skipped a beat like it was playing a little panic tap dance. “Okay. That’s it... you’re doing that thing again.”

“What thing?” Mark’s voice was all wide-eyed innocence, but he was grinning now, eyes half lidded and his hands toying with his fingers. William swallowed, looking around the room but it was up to no avail. 

Mark’s smile turned sly, watching William went very still. “Mark.” he paused, gripping his shirt. “Don’t worry,” Mark said with a small laugh, sighing dramatically as he flopped back against the couch like he wasn’t vibrating under the surface. “I’m not there yet. Just close, it's a pre-heat.”

“…And you thought movie night was a good idea?” Mark shrugged, his eyes were gleaming as he gets closer. “Wanted you here before it hit. Didn’t wanna be alone.”

Will caught his breath, the smell of intimacy alone made it heavier than anything Mark had said before. He reached out, brushing a hand through Mark’s ink black hair, gently ruffling it. “I’m not going anywhere.”

Mark turned his face into the touch and murmured, “Good.” burying his face into Will's shoulder as he inhaled his scent again. 

The rain softened into a steady hush. Mark had stopped commenting on the movie a while ago, and William hadn’t dared move since. Mark had gone still and asleep in a way that made William’s chest ache, the scent of sweetness was vague but it filled the room, just enough for Will to feel him. 

He looked down. Mark’s head was tucked under his chin now, breath warm and even against William’s collarbone. His hand, still lightly clasping William’s, had gone slack. The blanket had slipped slightly, revealing the soft slope of his hip beneath the waistband of his sweats, and William swallowed hard, eyes darting away like a guilty man.

He didn’t let go, keeping both of them in place as he sniffed Mark's scent glands, Mark smelled like home, he thought as he purred silently. Even under the shifting scent, he could feel the slow rising thrum of the omega's heat starting to creep in around the edges. He gently pressed the soft skin and Mark purred at the touch, he still smelled like something William wanted to hold onto. 

He shifted slightly, careful not to wake him and let his free hand rest lightly on Mark’s back. Through the fabric of his top, William could feel the steady rise and fall of his breath. The gentle press of muscle and warmth welcomed him with the comfort of his heartbeat.

His body didn’t know what to do with it. Every nerve felt strung tightly, every inhale laced with a sweetness that wasn’t just scent, instead it's trust. Mark was dozing with his whole weight leaned into him, defenseless and vulnerable. William let his head tilt back against the couch and closed his eyes, patting his hand on Mark's shoulder. “Don’t you dare start dreaming about this,” he whispered to himself.

William woke up before Mark, the TV screen still on with a news channel about Mark's previous fight in the background, Will smiled at the picture of Invincible in a heroic pose, then looked back at the man sleeping on top of him.

It wasn’t intentional, felt like a blink and the world was gray and quiet, light bleeding in through the curtains, and Mark still asleep with his legs tangled through the blanket like he’d melted there overnight. 

And the scent... was uncalled for, it had bloomed overnight. It was stronger but not too overpowering to trigger a full-blown rut. But it's still heavy nonetheless, warm in a way that made William's body shift on instinct, like he was trying to hide the way his pulse was quickening.

Mark shifted in his sleep, brow furrowing. A little sound escaped him as a half sigh, half expecting something else. He was getting needy. Mark's eyes cracked open, dazed with sleep, lashes fluttering as he blinked up at him. His voice was hoarse when he spoke. “You stayed.”

William nodded. “Yeah. You said you didn’t want to be alone.” he nudged his head, fingers cupping his cheek before it turned flushed pink.

Mark gave a small smile, hazy and pleased. “Still don’t.”

William swallowed, fingers tangled on to one another. “Mark... your scent—”

“I know,” Mark said, barely audible, eyes slipping closed again as he tucked his face against William’s arm, rubbing his thigh together as he let out a whine. “...’S why I asked you to stay. I can feel it now.”

There was no heat in his voice yet, he could still think with a clearer mind and William’s chest tightened. His thumb brushed lightly along Mark’s shoulder with a shudder, unsure if he meant to comfort or tempt. "Is this your first heat?" He asked curiously, Mark nodded soon after. "... It's a bit late, but I think I can handle it."

Will stared at Mark, tilting his head. “You’re not scared?”

Mark hummed. “Not with you.”

Chapter Text

William looked at him for a long moment, the way he said it with a breathy tone, confidently sure about his decision. “Okay,” he murmured, patting his back. “Then I’m not going anywhere.”

Mark didn’t need to open his eyes to know William was still there. Mark could feel him warmth, tense in that way he got when he was trying very hard not to react. Like if he so much as blinked wrong, William might act unlike himself. The tension pulsed off him in waves. 

Mark shifted just a little, stretching like a lazy cat across the couch, not caring that the blanket slipped a bit lower on his waist. He felt William’s hand twitch as he inhaled his faint alpha scent.

He mumbled under his breath, voice still heavy with sleep and incoming heat. He fully opened his eyes, lashes low, gaze sliding toward William like it was the most casual thing in the world. But his fingers weren’t so casual. They slid up, brushing lightly and accidentally slides along William’s thigh teasingly.

William inhaled sharply as Mark watched the way his jaw clenched, the exact second restraint cracked and a hand caught his wrist, still gentle and careful with him. “I told you I’d stay,” William said, voice quiet but low. “Don’t make me regret saying that.” Mark chuckled softly, rubbing his hands in circles on his skin. 

Mark leaned in, close enough to let his breath brush against William’s jaw. “You’re not going to regret anything,” he whispered. “You’re going to watch me fall apart, and you’re going to keep pretending you’re not thinking about it every second I touch you.” Silence filled the room, Mark pulled back just enough to look at him. “Tell me I’m wrong.”

William didn’t say a word, his mouth agape. But his grip on Mark’s wrist had tightened just slightly. His scent had shifted too, no longer clean and cool and “safe.” There was heat in it now. Raw, quiet alpha rut reacting to his scent, the kind that said he was being good. But only because he needed to be, the rut wasn't too far enough to make Will snap yet.

Mark wanted to see how far that could stretch it, he didn’t pull away. Not from the grip on his wrist, not from the look in William’s eyes—dark, intense, locked somewhere between desire and warning. He leaned in closer with a small smirk.

“Tell me you don’t want this,” Mark whispered, voice hushed and silken. “Look me in the eye and say it.”

William’s breath hitched. One, two seconds too many. His hand stayed right where it was, fingers wrapped tight around Mark’s wrist like he was holding a fuse he shouldn’t light.

And then his other hand rose slowly to cradle the back of Mark’s neck firmly, it felt warm and just right. Mark felt his breath hitch, that tipping point he’d been testing since last night. William’s thumb brushed the edge of his jaw. “You think you know what you’re asking for,” he murmured, voice like thunder behind clouds. “But I don’t think you do.”

Mark’s pulse spiked. “Then teach me.” That was almost too much. He felt William’s grip falter. Not in weakness but in his control barely holding on.

Their lips were inches apart, so close Mark could taste the kiss that didn’t land. William didn’t move, his breath shook against Mark’s skin, and then he pulled back just enough to whisper, “Not like this.”

Mark blinked, heat still coiling low in his stomach. “Why not?”

“Because if I kiss you now, I’m not stopping there. And you’re not thinking straight when you're in heat.” He wanted to argue. He wanted to say that this was him. That it wasn’t just heat—it was want, need, him. But William was already standing and putting space between them.

“You hungry?”

It was infuriating. Mark sat back, flushed and aching and annoyed in the best way possible.

“… Yeah,” he muttered. “Starving.”

The kitchen smelled like eggs and toast and William trying very hard not to think about last night.

Mark leaned on the counter, wearing the same top from before but now tugged low enough to flash just a bit more collarbone. His hair was messy and undone, eyes sharper than they should’ve been for someone who’d just woken up.

He licked syrup off his thumb very slowly, finishing it off with a small pop. William didn’t look. “Need help?” Mark asked, voice sweetly innocent.

“No.”

“You sure? I’m great with my hands.” There was a sharp clatter as William dropped his spatula, looking away.

Mark smirked. “Oops.”

William finally turned to glare at him, raising an eyebrow. “Mm.” Mark leaned a little closer over the counter. “What if I don’t want you to pretend?” he traced the lines across Will's back, eyes staring at him with desire as if he wants to be noticed. William paused. Mark’s scent was much more thicker now. He could see William breathe it in—how his whole body twitched just once, hands clenching around the edge of the counter.

“I want you to mean it,” William said lowly. “Not just because your heat’s starting. Not because I’m convenient.”

Mark’s voice dropped to match his. “What if I mean it especially then? What if I want you because you’re the only one I’d let see me like this?”

William paused for a moment, "Really?" He placed his fingers underneath Mark's chin and tipped his face up. "You let Amber saw this side of you." Mark silently whined at that, although Will didn't mean to bring other people's name up on the spot, and retract back to with a small apology.

"Not necessarily. She's a beta, but she already figured it out before I even said anything." He paused, "But you... You're an Alpha, and I've known you since forever." He pressed his chest on Will's back just to feel his heartbeat, burying his face on his shoulder as he sucks in a breath of his scent again. 

William froze, his cheeks were red as he tried to ignore the soft skin pressing against him. He turned off the stove and set the pan aside, coming to stand in front of Mark with a flushed face, William’s jaw tightened. “You’re not even trying to be subtle anymore, are you?”

“Why should I be?” Mark walked over slowly, “You’re not exactly discouraging me.”

Chapter Text

William retreated back to the sink like it was the only way to cool off, he closed his eyes for a moment, breathing slowly. Mark's scent lingered like summer heat in a room with no windows, almost suffocating him. It wasn’t overwhelming yet, but it clung to him. William was starting to feel it in his chest, his body slowly losing and his rut taking over.

Mark made it worse without even trying, or maybe especially because he was trying to set off his rut. His top had ridden up, exposing a sliver of lower back when he reached for a glass. Just a flash of skin and the dip of his waistline, where the hem of his sweatpants barely clung to sharp hip bones. William looked away, and looked back. Of course he did, they both know that Mark was too pretty for his own good.

He hummed a sweet tune as he poured a drink, swiftly set the table and sat on the couch to let William focus on cooking. Mark looked back at the kitchen, trailing his eyes on William's back as he works on making their breakfast. He smiled at the sight, softly sighing as he pressed on the AC remote, clicking it again up to no avail. He pressed again, then sighing. 

“Is the air conditioner broken?” Mark asked innocently, walking back to the kitchen and opening the fridge, practically bending over for no reason as he let out a soft hum when the cold air hits him. “It’s hot in here.” Mark looked over his shoulder with a small smirk, although yes, it was hot in there, he knew it was an opportunity to shamelessly tease the alpha in the room. Soon after, he shuts the fridge and turned, backlit by the morning light and still halfway leaned against the door. “You look good when you’re flustered by the way.”

He brushed against William just barely as he reached past him into the cabinet. This time it was deliberate, the swipe of skin-on-skin where his hip nudged William’s waist. The muscle flexed on purpose, William was sure of it. “Need a plate?” Mark asked sweetly. William grabbed the counter so he wouldn’t grab him so suddenly. Mark’s grin widened, lifting the plate from the cabinet while on his tiptoes, with a stretch that made his shirt ride up until his stomach, muscles shifting just right, the lower line of his abs on full display.

William made a sound in his throat that definitely wasn’t polite. “Mark.” 

“Hm?” He turned, innocent again. Mark stepped in closer, slow and sultry, he placed down the plate next to the stove and leaned closer until his breath was ghosting against William’s ear. “I haven’t even started yet and you're already this worked up?”

It felt like a blur, William ended up sitting on the sofa again, the coffee table had just drinks Mark had set up to fizz before. He turned on the TV screen and sighed as the heat of the room finally gets to him. 

William had tried to focus on anything but Mark for the past five minutes by looking at his phone, the news, the ceiling fan, the walls, but none of them had the scent or the kind of eyes that made an omega irresistible. 

Mark stepped into the living room, balancing his plate with exaggerated care. He made a show of looking around for somewhere to sit with their dishes in hand, even though the couch had plenty of space. William didn’t even glance up from his phone when he said, “There’s room.”

Mark just smiled at him, placing down the plates. “Oh, I know.” Then, without warning, he dropped himself directly into William’s lap. Settling nicely like he belonged there, with one leg over William’s, arms loosely draped around his neck, back arching just enough to press close.

William's body stiffened, his grip on his phone loosened as he looked up to face him. “You—” His voice cracked.

Mark picked up a piece of toast and took a bite, and chewed like nothing was out of the ordinary. “Problem?” he purred, glancing away to watch the news and whistled at the sight. 

“Mark.” He turned, brushing toast crumbs from William’s chest “You’re so tense,” Mark commented, his fingers rubbed on his scent glands. “You should relax.” 

“I can’t relax when you’re—” William broke off, voice caught between a growl and a whimper. “You’re—on my lap, Mark.” the Omega on top of him rolled his hips teasingly, his scent closer and stronger than before. 

“...I noticed,” Mark said sweetly, and leaned in, breath against his neck now, body shifting until—

Buzz.

William flinched, shuffling to reach his phone. Mark blinked dumbfoundedly as he watches William's phone lit up. The screen read: Debbie Grayson. Mark hissed under his breath. “Oh my God.”

William stared at the phone screen, doubting if he should answer or not. Mark scrambled to slide off his lap, with a piece of leftover toast still in hand. “Don’t answer it.” he looked back at him.

“I have to answer it!” William groaned, swiping to pick up with all the composure of a man just caught with both hands and face red. “H-Hey, Mrs. Grayson!”

Mark mouthed 'I’m gonna die' as he retreated to the hall next to the kitchen, his body leaned on the wall in shame. William tried desperately to sound normal, his hand slightly trembled. “Oh, yeah, yeah, he’s—he’s here. Sleeping still. Big patrol yesterday, so I told him to crash here.”

There was a pause. Mark crept toward the bedroom door with a silent groan. “Uh-huh… No, we didn’t—he didn’t say anything about symptoms, no fever, he just seemed… tired.”

He shot a death glare at Mark, who vanished into the hallway. William ran a hand over his face.

“No, I promise I’d call if anything seemed weird. He’s just resting.” It wasn't entirely false, he was just resting. It just happened to be on his lap, with his shirt halfway up, grinding on his thigh and a look on his face like he's about to lose it.

William barely made it through the call with a breath of relief when he finally convinced her that Mark was in safe hands. When it ended, he stared at the blank screen for a full ten seconds, the living room was wrapped in the low hush of storm-muffled sound, the TV cast flickering gold and blue light across the couch. The rainy season was really starting to come down more often. 

Mark was curled up under one of William’s blankets. More accurately, William’s blanket wrapped around Mark’s body like a cocoon. When he heard the door creaking open, he finally lets go of the blanket, still frustrated about the heat, with one bare leg out and a top that had slid dangerously low on one shoulder.

William was doing his best not to stare. But Mark was so comfortable doing it on William's own bed, he only sighed and gets closer to him. 

Mark had been quiet after the call, which should’ve been a red flag. He hadn’t teased, just… draped himself on the bed and slowly melted into it, like the heat was working through him, humming beneath the surface of his skin, aching and barely keeping it together. "Are you alright?" William asked, voice soft beneath the rain.

Mark didn’t look over, trying to get comfortable. “Mhm.” He nodded, his eyes were closed and his breathing was different, a much lower and slower tone. Measured like he was trying to hide it.

William waited a few minutes. Then Mark shifted again, the blanket slipped a little more to expose his bare thigh, flushed, gleaming slightly with sweat, it slid across the cushion until it nearly brushed William’s. And that scent, sweet and sharp and unmistakable, curling low into William’s chest, hungry. Not the teasing kind from earlier. This was a different scent of need.

William turned toward him. “Mark.” This time, Mark looked up. And his pupils—God. They were blown. His lips parted, his chest rising too fast, a slight, unsteady tremble in his fingertips where he clutched the edge of the blanket.

“I think it’s starting,” he whispered.

William’s voice was caught halfway between panic and something darker. “Your heat?”

Mark nodded once. And without waiting for permission, he slid closer, the blanket pooling around his waist, one hand lightly resting on William’s thigh. 

Breakfast was already forgotten long ago, “Can I stay here tonight?” he asked, breathlessly. “Just… stay close?”

William swallowed hard. “You don’t even have to touch me yet,” Mark continued, voice dropped to a soft, sweeter tone. “I just don’t want to be alone.”

Chapter Text

The lights were low, the rain still dripping and darkening ke sky. The room smelled like ozone, although with warm blankets, something sharper creeping beneath Mark’s skin, there was a sweet, animal-like smell curling out with every breath he took. 

William didn’t answer right away, watching Mark with a soft hum. One of his hands came to rest lightly on Mark’s waist, tugging his clothes gently. The Omega was sitting there with weight and heat, snuggling nicely. 

Mark’s lips parted like he might say something else, but instead, he leaned in slowly until his forehead pressed to William’s shoulder. His breath came in little hitches, like his body couldn’t decide whether to settle or shudder. “You’re burning up,” William murmured, placing a palm on his forehead, Mark made a soft noise. 

“I know.” his eyes softened, “I can’t,” he said with his voice cracked open. “It’s—too much.” William shifted on the bed, letting Mark press closer and guiding him between his thighs so they sat chest to chest. Still clothed and their layered bodies warmed up the room. William’s hands settled at the base of Mark’s spine, warm and steady.

“You said I didn’t have to touch you,” William whispered against his hair. “But you’re clinging to me like you’ll fall apart if I stop.” Mark didn’t deny it, he curled tighter in William’s lap, arms winding around his back and lightly thrusted up.

“Can I...” he hesitated, “Can I just... scent you? Just a little?” his hands trailed up from his back to his scent glands, rubbing the back of his neck slowly as he tightened his grip on his thighs pressing harder. 

William exhaled slowly. “You’re already scenting me.”

Mark nodded into his chest. “... Please.” after a couple of seconds looking into his eyes, William tilted his head, letting Mark’s mouth ghost over his throat. He could feel Mark dragging his lips there like the scent alone could ground him. William felt the tremor that passed through him, a tight, low, and desperate for touch, and he lets him.

For a while, they stayed like that, pressed together under the blanket, Mark scenting him quietly while mentioning how his scent feels like home to him, breathing him in like he was oxygen. William’s hands slid under Mark’s top, his fingertips brushing the small of his back. Mark jolted, hips twitching in reaction to his touch. William smiled. “Still not touching you,” he murmured, just behind Mark’s ear.

Mark whimpered. Actually whimpered. “You’re being mean to me right now.” he licked the back of his neck again, "Not fair." He pouted.

William smiled, biting back a laugh. “I’m being merciful here.” Mark lifted his head, pupils blown wide, lips pink and trembling. “Doesn't look like it.” William leaned in, lips brushing Mark’s. He pulled away again, settling him firmly in his lap, aching contact was all he was going to get for now.

Mark buried his face in William’s neck and made a noise that sounded like a whine. He was trembling now, too warm and needy, pressed full against William in his lap with no shame left. The heat in his body was blooming like a fever, thick in his blood, making him twitch every time William shifted beneath him. Their bodies hadn’t moved much, but the atmosphere definitely had changed.

He was grinding slowly on his lap eithout even noticing it at first. Every press of Mark’s thighs, every brush of his hips was all uncoordinated in a slow, pathetic way only needy Mark could ever do, and William let him do anything with it.

William let one hand drift up Mark’s back, under the tank top, until his thumb rested just under the ridgeline of his ribs. Mark shivered like it was a kiss. “You’re soaked,” William whispered, and Mark barely heard him as his head spiked up.

Mark blinked, dazed. “What…?” 

“Not there,” William clarified with a small laugh. “Your shirt, you’re sweating through it.”

Mark glanced down at himself and gasped, he hadn’t even noticed. The thin fabric clung to him, translucent over his stomach, sticking to the curve of his chest. He shifted—and the top rode up further, flashing more skin, more sweat-slicked muscle.

William whistled low. “You’re gonna melt if I let you keep going like this.”

“Don’t care.” William eased Mark back enough to make him whine at the loss of pressure, grabbing the throw blanket and started fanning him with it.

Mark just blinked. “I told you I was being merciful.” he looked up at him with a soft smile, “You’re lucky I didn’t stick you in the shower.” Mark rolled his eyes at him, he looked ready to mouth off, but another wave of heat made him visibly wilt as the warmth in his stomach heated up. His fingers clutched at William’s collar, “You’re not funny,” he muttered.

William kissed his hair, soothing him gently as he reached for the bedside table, “I’m hilarious. But also, you need to drink up.”

He held out a cold bottle of water from the table, Mark squinted at it like it had personally insulted him. “You’re giving me water during this?”

“You’ll pass out if you don’t stay hydrated,” William said, all gentle practicality. Mark groaned in defeat, takin a sip out of spite. He leaned back against William again, skin flushed, body heated, limp and desperate.

“This isn’t fair,” he said, eyes half-lidded after gulping down the last chug. “You’re supposed to—”

“Not yet,” William murmured. “You’re not ready. You think you are, but you’re not.”

Mark whimpered again, quieter this time. William kissed the edge of his jaw. “When you are… I’ll make sure you know it.”

He should’ve seen it coming.

The way Mark had started to tremble, the unbearable heat curling through him built the pressure, higher and tighter. He was panting now, clinging to William like it was the only thing keeping him from combusting.

William had tried to help, sorta. He tried comforting and teasing just enough to keep Mark from falling too deep into that omega haze. But he found himself failing when he tried to hold back.

He could feel it in the way his hips rolled just so, not by accident anymore, but with clear, biting purpose. He was still clothed, but the friction of his soaked-through shorts and the pressure of William’s thigh under him made it worse, made him squirm harder, his breath come in little gasps between whines.

William’s hand slid up his back again, gently. Mark arched into it with a desperate sound. “Please—”

William’s voice stayed low. “Breathe.”

“I can’t,” Mark gasped. “I... fuck, Will, it’s—too much.”

“I know.” Mark’s whole body was flushed, his skin hot enough to burn, pupils were blown wide, lips pink and trembling. His scent had gone feral, raw and wild, no longer coy or teasing. He was fully in heat, and Will couldn't help but gulp at the sight.

It was barely a second before one sharp gasp, one shake of his body and he ground down against William’s thigh with a broken, shameless moan. His whole body rocked, legs tightening around William’s hips like his heat had finally taken full control.

“Mark,” William said sharply, but his voice was useless under the storm of sensation that crashed into them both. He could feel his rut starting to form, biting back a moan as he could feel the friction against him.

Mark was panting, grinding harder, fingers digging into William’s shoulders. “I c-can’t... I need... I need—”

William gripped his waist, anchoring him but didn’t stop him. “Shh,” he whispered. “You’re okay. I’ve got you.”

Mark keened, low and high all at once, rutting like an animal, it was all too much. Too much for him, even. Watching Mark fall apart because of him, Will shuddered as he gasped a low growl, he could feel himself getting hard at the sight. “Mark—” he gripped him tighter.

Mark surged up and kissed him in a sloppy desperate moan. Their lips met and scent shared, William grunted, catching him while trying not to lose it himself. “You want it that bad?” William rasped against his mouth. 

Mark nodded into the kiss, too overwhelmed to speak now. William exhaled sharply. He wanted to drag it out longer. But Mark’s body was soaked and feral. William gripped his ass and pulled him closer, Mark moaned shamelessly, he wasn't exactly quiet. The moment was something William felt straight down his spine, he kept the pace slow, licking Mark's neck and nipped a bite since Mark deserved that much.

“You’re getting it,” he said low and firm. “But you’re getting it my way.”

Chapter Text

It wasn't long to see their clothes forgotten, some torn off and left somewhere in the room, William didn’t care.

Mark hit the sheets already gasping, burning up with a much more intense heat. William climbed in after him carefully towering over him and caging him with his arms. 

Mark spread for him instantly, legs open, body flushed and slick with sweat. His chest was heaving, pink and tight with need. His cunt was already dripping, flushed and twitching, like it knew who was coming for it.

“Will—William—” Mark was begging before anything even touched him.

“Easy,” he murmured, pressing one hand to Mark’s chest, holding him down gently as he hovered over him. “You’ve waited this long. You can wait a little more.”

Mark’s hips jerked. “I can’t—please—”

“You can.” William slid his other hand between Mark’s thighs, feeling the slick folds and the twitch of heat-sensitive skin until Mark was full-on shaking.

“You’re completely soaked now,” he whispered softly, “Dripping all over the sheets. You know that?” Mark sobbed something incoherent, spreading himself wider as he got lost in the moment. William slid two fingers in slowly and Mark arched his back as he cried out a soft moan.

“Already clenched so tight,” he muttered, watching the way Mark’s body fluttered around him. “You’re so fucking ready. I’m gonna take my time with you, okay?”

Mark shook his head, pleading, grabbing at his arms. “N-no! I’ll die. Please, I’m gonna... you can’t—”

“I can,” William said calmly, because he was losing it too but not yet. “You want it so bad you’d let me fuck you senseless right now and forget your own name.” he paused, taking a sharp breath. "But promise me to not let your heat consume your mind too much."

“Yes! Oh fuck, Will. Please—”

“I’m not letting you forget it.” William leaned down, teeth just barely scraping the edge of Mark’s throat, gently kissing the skin. “You’re gonna remember this moment as your first with me. And I want to cherish it."

Mark whimpered, thighs twitching around William’s hips. Will curled his fingers just right inside, pressing and massaging the right spot inside him that made Mark see stars. His back arched, breath shattering, hips grinding down in frantic, soaked desperation. William held him through it, kissed his jaw, stroked him slow and careful while his body tried to ride out that first burst of relief.

“You’re not done,” William breathed against his ear. “That was nothing.” Mark sobbed again, already climbing back up. William finally lined up and started pushing in slow, Mark’s cry was raw and grateful, so damn loud the storm couldn’t drown it out.

He buried himself halfway and paused to admire the view beneath him, he gripped Mark’s thighs when he tried to buck.

“No,” William rasped. “You don’t get to rush this, you wanted me to help, right?” Mark was shaking again, letting out a loud growl. It was so close.

William wasn’t planning on going to stop guiding him through it.

Mark was so tight around him. Clenching down like he didn’t know if he wanted to pull William in or push him out, his body couldn’t decide between desperation and overstimulation.

William decided for him. “Relax,” he murmured, slick still dripping out of him, hips flush against Mark’s thighs, he looked down to see just the head of his cock inside. Barely anything, yet it was just enough to feel him.

Mark yelped, grabbing at the sheets or William’s shoulders, he didn't care. His omega instincts was screaming for more.

Will watched how flushed his skin was, how his lower lip trembled, his chest heaved like every breath was an effort. The slick mess between his legs was obscene, his cunt fluttering around William’s cockhead, sucking him in with every tremble of his hips.

“Will—please,” Mark gasped. “I’m gonna—fuck, I need—”

“I know,” William said softly. “But we’re gonna take our time.” He eased forward an inch. Just enough to stretch Mark, just enough to feel that sweet little gasp that escaped his throat and stopped. Mark’s hands clawed at him, his thighs quaking. “Please please please—”

He slowly thrusted until he added another inch. Mark whimpered, eyes rolling back, his mouth open and wet. William leaned down and kissed him slowly, all tongue and warmth, nothing like the rut Mark’s body was crying for.

“You’re doing so good,” he whispered into his mouth. “Taking me just like that. Little more now... that’s it.” Another inch as Mark’s legs twitched. His voice cracked, William smiled against his cheek.

He sank in halfway now. Mark was slick enough to drown in, trembling so hard the bed creaked under him, but William kept his pace glacial. The weight of his body pressing Mark down, the storm still dampening their sounds from outside, sweat beading between them.

Mark arched up, tears slipping from the corners of his eyes. He couldn't believe that he was ruined already and William hadn’t even moved yet, the sheer estcasy of it alone was enough. “You’re shaking,” William murmured, brushing a hand up Mark’s trembling stomach. “Want me to stop?”

Mark shook his head violently, gasping. “No—don’t you dare.”

“Then you let me lead.” He pushed in the rest of the way with one slow, deep stroke, Mark finally screamed In pleasure. Finally, finally being filled the way his body had been begging for all night.

William stayed buried to the hilt, letting Mark feel every hot, twitching inch inside him, holding him there, breathing with him. He carefully watched his expressions, noting down the details and letting Mark adjust before moving.

“You okay?” he asked again, lowly. Mark moaned something that might’ve been yes, might’ve been more. Either way, William kissed the side of his mouth and started to rock his hips.

The pacing was long, slow thrusts, but it hits deep to Mark's core, falling apart beneath him. He was beautiful like this.

Sweaty, flushed, absolutely wrecked and not even close to finished. William moved inside him like it was the only thing that mattered, still pacing with the slow, deep strokes, each one wringing a moan out of Mark’s open mouth.

He was so tight, flooded with slick and hot, it felt like he might melt around him. And every time William pulled almost all the way out, waited, then pressed back in deep, Mark sobbed. “I can’t—Will, I’m gonna—”

“You’re not coming yet.” William’s voice was soft, but firm, right against his lips. “Not until I say so.” Mark whined, hips bucking, but William pinned them down easily. One hand firm over his lower stomach, keeping him grounded. Holding him right on the edge. “You feel that?” he murmured. “You’re so full, taking me so well.”

Chapter Text

Mark was crying. It was all too much and yet it's still not enough. Every slow thrust made his cunt clench and his thighs twitch. His body beg for more even as it couldn’t take what was already happening.

William smiled, dropping down to kiss every inch he could reach—Mark’s chest, his throat, his cheeks, licking salt and sweat and soft whimpers off his skin.

“I’m not gonna let you break yet,” he said softly, even as Mark begged. But Mark was getting close. His body was pulsing in time with William’s thrusts now, his slick soaking everything between them, little high-pitched cries escaping with every grind of William’s hips.

“Please,” Mark choked. “I need—I’m gonna—please—” William stilled deep inside, unmoving. Mark screamed in frustration, writhing under him as he tried to grind himself deeper. “Not yet,” William breathed. “Not until you beg me right.”

Mark blinked up at him, dazed and trembling. “I... please, I’ll do anything! I just... I need you to—fuck, please let me—”

“Beg for it like you mean it.”

“I do!” Mark sobbed, legs trembling so hard they were barely holding around William’s waist. “Please, I wanna come, I wanna feel you, please Will, I need it, I need you—need you to make me come—”

William kissed him hard, bit his bottom lip and started moving again in a faster pace, their joints felt controlled still, but deep, powerful, and ruthless. Mark’s body arched, and cried in satisfaction.

It was everything. He came with a shuddering gasp, thighs twitching, cunt clenching around William like it was trying to drag him in forever. His voice cracked, whole body locked up and wrapped around him, William didn’t stop.

He kept going through it, whispering praise into Mark’s mouth. Kissing him like he was precious treasure, even as he fucked him through every last wave of that explosive first orgasm. “Good boy,” William whispered. “So perfect, so good for me.”

Mark went slack beneath him. His breath hitched in these soft, broken little gasps, body twitching with every lingering throb. William didn’t pull out, just stayed deep, warm, keeping him filled. He brushed sweaty strands of hair from Mark’s damp forehead and kissed his cheek, his jaw, his temple.

He murmured, kissing the corner of Mark’s mouth. He made a small, shaky noise, still trembling, collapsing onto him. “I’ve got you,” William whispered. “You did so good for me.”

Mark nodded a little, too loose and dazed to speak. He looked wrecked. Flushed and boneless, like every muscle in him had forgotten how to hold tension, William loved it. Loved seeing him like this, completely undone, still clinging to his shoulders like he was the only thing grounding him.

William’s cock was still inside, still hard. And Mark’s cunt was still fluttering around him, silently begging for friction. He rocked his hips a little, just enough to feel Mark’s entire body seize again, legs twitching, breath catching hard in his throat.

“Still sensitive?” William murmured with a small, amused smile. Mark nodded weakly, a little desperate sound escaping. “Too bad.” He rolled his hips again, slow and deep.

Mark shuddered, a breathless oh catching on his tongue. “I said I wasn’t done,” William whispered. “You can give me another one, can’t you?”

Mark blinked up at him, pupils blown wide, lips trembling. “C’mon, baby,” William coaxed, one hand sliding down between them. “You’re still soaked. Your body’s still begging.” And it was.

Mark’s hips jerked when William touched him, fingers brushing over the swollen, overstimmed heat of his slick little clit. He moaned, high and helpless, trying to pull away and grind closer at the same time.

“You wanna come again?” William murmured. “I know you do. I can feel it.” Mark tried to speak, but it came out as a whine. So William pressed into him again. Just like before. Slow, relentless thrusts. Every movement dragging across overstimmed nerves, coaxing tears back into his eyes.

His voice cracked. “Will—please, I can’t—”

“Yes, you can.” He kissed his shoulder, trailing up a line of kisses on his neck to his lips. “You’re gonna fall apart for me again. And again. Until I say stop.” Mark whimpered, twisting his fingers into William’s light brown hair. Mark's legs were trembling again, his entire body was starting to pulse, already building again, fast, a little too fast.

William didn’t stop, he kept on praising him, fucking him slow and steady while his hand circled Mark’s clit in tight, perfect motions. The rain outside was deafening now, thunder shaking the windows but all William could hear was Mark’s breathless, wrecked voice. “I—I’m close again—please—”

“That’s it,” William whispered. “Be good and give me one more.” Mark screamed when he came again, louder this time. Like he couldn’t believe his body could even do this again, so soon.

William kissed him through the whole thing, held him together while his body broke all over again.

Chapter Text

He didn’t know how he was still conscious. His body felt like liquid, melted into the bed and barely even separate from William anymore. He’d already come twice, full-body, gut-wrenching orgasms that left his thighs shaking and his voice hoarse and William still hadn’t pulled out.

Not that Mark want him to anyways, he whimpered when William slowly shifted them, arms firm around his waist, drawing him onto his side without ever slipping free. The stretch made his toes curl. William’s cock was still so thick, so deep inside, and now…

He was pressed flush to Mark’s back, chest to spine, arms wrapped around him tight. He felt held, claimed. Felt so... “Still with me?” William’s voice brushed his ear, low and gentle, his breath brushed over Mark's skin. Mark nodded, but it was weak. He made a little sound, trying to press his back against him, but his legs were useless. He couldn’t even think clearly, only feel the overwhelming heat inside him. 

“Good,” William murmured, nuzzling into his neck. “You’re so perfect, I could stay inside you forever.” That sentence alone made Mark throb. He gasped out in a soft, helpless tone when William rolled his hips again. Barely a thrust, a slow thick drag of cock inside his still-clenching heat. It was too all much to handle, yet not enough to satisfy him. 

He ached, not in a bad way. Until Will stopped half-way, panting hard as he tipped Mark's head upwards. "Look at me." He pressed a gentle kiss on his skin. "Do you still want me to knot you up and claim you as mine?"

Mark's whole body pulsed around him. Every motion made slick squish between their thighs, and the pressure, the way William’s cock felt bigger now, heavier—was impossible to ignore. He stuttered in his voice "Y-yes! Please, Will— I-I need it." His gasp was breathless, clinging to him tighter. 

Mark knew what was coming, looking over his shoulder with a sly smirk as he tried to roll his hips again. “Will…” he whispered, voice fragile. “You’re…”

“I know.” William kissed his shoulder. “Not yet, just let me hold you like this a little longer.” he paused, dragging his finger to tuck his hair behind his ears. "Just making sure it's not just the heat talking, and you won't regret this after."

His arms tightened around Mark’s chest, his other hand stroking slow across his thigh. Mark’s whole body burned, his nerves more sensitive to his touch as he inhaled the alpha's scent. His cunt was still fluttering around his length, like it didn’t want to let William ever go.

That pressure… it was building again. Mark held his arms tightly, trying to keep up with his breath. "I promise, Will. I... I need you." His breath hitched, "I'll never regret this, so please—" he yelped as he felt another wave of heat burning up. 

His instincts were telling him that this slow, spreading awareness, William’s knot was forming, and soon, he wouldn’t be able to leave at all. Will wasn’t thrusting, staying deep and rocking slowly, letting his cock swell inch by inch inside Mark’s overstimmed, soaked heat. “You feel that?” he whispered.

Mark gasped. “Yes…”

“I’m gonna fill you up,” William said softly, gently kissing his forehead. “Gonna knot you and keep you full all night. We both know you're dying for it.”

Mark’s body tensed. His mouth fell open—but no sound came. He didn’t know if he could take more. But he didn’t want to stop. Not now. Not when William was still so gentle with him. Not when he was shaking in his arms, trembling on the edge of something huge.

“I want—” Mark swallowed, voice breaking. “I want it.”

William kissed his cheek, slow and firm as he pressed his palm tighter. “Then I’ll give it to you.”

Mark didn’t remember the last time he breathed right.

His skin burned, thighs wouldn’t stop twitching. William’s knot was swelling thicker inside him even when he just came inside, pressing so deep it made Mark want to cry, and still, he needed more. 

He whimpered into the pillow, slick dripping down his thighs, hips instinctively grinding backward as if that’d earn him something. More friction, more depth, more. “Please…” he whispered. “Please, Will, I need—”

“What do you need?” William’s voice was pure silk, stroking over his raw nerves teasingly. He was behind him, grinding in slow, deep rolls that made Mark’s toes curl every time the knot pressed against his rim.

“I need you to fuck me again,” Mark gasped. “Harder. I—I want it rough, please—” William blinked, rubbing circles on Mark's love handles. 

“Oh? Thought you were too sensitive.” William’s voice had lowered with a faint growl. “You sure you can take more?”

Mark didn’t hesitate to answer. “I need it. I need your knot, I want—I want you to mark me—”

Without a second thought, William pulled out in one swift motion, making Mark cry out at the empty stretch and manhandled him onto his stomach, hips dragged up and back until Mark was face-down and ass-up, cheek pressed to the pillow, back arched for him perfectly.

“God, look at you,” William groaned, guiding his cock back to Mark’s soaked entrance. “Fucking dripping for me. You want to be mine that bad?”

Mark nodded frantically, biting down on the sheets. “Yes—please, please—”

William didn’t wait. He shoved back in deep, one slow, brutal thrust that had Mark keening, body snapping tight around him before he finally moved.

He thrust hard, fast, rutting deep into Mark’s fluttering cunt, the sound of skin slapping and slick squelching echoing beneath the rain. Mark screamed, hips bucking, body going rigid under the onslaught of raw, mindless pleasure.

“I’m gonna mark you,” William growled, leaning down over him, hot breath at his neck. “Gonna bite you, right here—” His teeth scraped against the crook between shoulder and neck. “—while I fuck this last orgasm out of you.”

“Yes—yes please—!” Mark barely got the words out before his body gave out. His third orgasm tore through him like a wildfire, body locked up, heat clenching impossibly tight, voice gone hoarse as he cried out, shaking under William’s weight.

And just as he came, William bit him. Sinking his teeth into that tender space and held, deep and claiming, while his knot finally, finally pushed in and locked tight inside Mark’s spasming heat.

The stretch was brutal and the pressure was even more unbearable. Mark sobbed into the pillow, whole body trembling as the aftershocks rolled through him, his throat raw and his cunt full—oh so full, plugged and pulsing, stretched impossibly wide around William’s thick knot.

He could feel the mark already blooming on his neck. Felt the bite throb in time with his heartbeat. And William stayed with him, panting, murmuring against his skin. “Good boy… my perfect little Omega… You’re all mine now."

Chapter Text

With one hand splayed gently over his belly and the other hand under his chest, William curled around him, still nestled deep and tied, feeling Mark’s slow little spasms every time he twitched or breathed too hard.

It was… bliss. All that sweaty and overwhelming experiences. Mark was trembling in his arms, flushed all over, his skin glowing hot even through the afterglow haze. William murmured against his ear, nuzzling into hims softly.

Mark gave a weak hum, barely containing his whining. His fingers found William’s and squeezed, even though his legs were still shaking. “Too much?” Will asked, pressing their heads together. 

“No…” Mark breathed. “Just… full. So full.” William’s cock throbbed at the way he said that, trying to gulp down the feeling to not take him there again.

He pressed a kiss to the curve of Mark’s neck, right above the bite he’d left, it was already bruising. The claimed bite on Mark's body shuddered at the touch, he could feel his knot still swollen and locked tight inside, holding in everything he’d given him, his warmth, release, ownership. “Good,” he whispered. “You took it so well.”

Mark giggled softly, a hint of tiredness in his voice. “And to think that was my first time in heat...” he murmured, voice all smoke and honey. 

William paused for a moment. “… God, imagine how bad the next one will be.” he shook his head and sighed, Will recalled back to his biology class when his teacher mentioned that a heat could be around 2-3 days for omegas, he gasped lightly. Mark lazily blinked up at him, smile slanted and too smug for someone so utterly wrecked.

“It’s a heat, Will. It’s not over after one night.” His voice dropped to a playful whisper. “Not even close.” William stared at him as Mark grinned. 

“I’m gonna need you. Like, a lot." He paused, "My dad said that usually it's around 2-3 days for humans, while in Viltrum, there are no Alphas or Omegas."

He curled up against William, softly gasping as he slowly rocked his body. "... But since the Viltrumite blood makes me stronger, so does my heat. I'm pretty sure I'll need you for the next couple weeks, maybe even months... I'm not sure.”

Weeks, Months? William swallowed hard, pulse stuttering as Mark’s hips subtly flexed back into him. Even tied, even the post-orgasm, his body still fluttered around William’s knot—clenching like it was already hungry again. He couldn't even handle his last boyfriend who was an omega, and even he was a human. Now this? “…Okay,” William breathed. “I'll try.”

Mark laughed softly and breathless. “Yeah,” he whispered. “You will be.”

And outside, the rain poured harder against the windows. While on the inside, they didn’t move, they didn’t need to. They just breathed together, tangled, tied up and close, as Mark’s heat pulsed slow beneath his skin heating up again. Mark purred lightly, his head turning to the side.

"Oh, and I'll need to tell my mom about this." Mark slowly rises up, careful to not hurt either of them. He touched his marked neck curiously, then hissing at the touch, suddenly feeling a bit of uncertainty as he gasped softly. "Shit." He paused. 

"What? Did you not like it?" Will slowly pushed his fingers to tip up Mark's head and exhaled softly. "... Did you regret what we did because of your heat?" Will could feel the panic in his own voice started to crack, his heartbeat rising and the thought of his post nut clarity hits him all at once. 

"N-no! It's just that... You've marked me," he sighed, curling himself on the bed. "Even though I've already introduced you as my boyfriend, I haven't introduced you as my mate yet." He pouted, 

"Ah, so that's why." Will sighed in relief, though the clouding mind in him worries about him accidentally knocking up Mark or worse, talking to his parents about it. He leaned down and shamelessly brushed over his scent glands, tracing it, "I heard that the mark could fade overtime, by then your heat would start again. It's not exactly permanent." 

Mark only hummed, pulling the covers as he gets himself comfortable even while still knotted. William traced his hands along his body, feeling his soft skin and previous scars as he talks to him. "You know, I didn't know you were an omega until it's too late." He paused, pressing a kiss on his neck. "Maybe because you haven't had your heat or scent developed yet, I've always thought you were a beta then."

Mark gently laughed, "... And I've always thought you were a little bit too small for an Alpha." The two exchanged glances and laughs, William looked down at him with a half-offeneded look on his face and scoffed playfully. 

They both had agreed to rest up for a while, but Mark couldn’t sleep. Not because he wasn’t tired, he really tried to. He was, it was just that his whole body felt heavy and raw and full. Stuffed so deep he could still feel William’s knot twitching when he shifted.

But that was the problem, every tiny movement kept sparking something in his spine, whether it was a throb or a flutter of heat, it was just enough to make him wiggle again. William groaned softly behind him every time. “You’re doing that on purpose,” Will mumbled into his hair, trying to rest himself.

Mark bit his lip, looking around lazily. “Maybe.”

“You’re gonna start another round like that,” Will warned, voice rough and thick with sleep, yawning as he tried to pull out yet he let out a groan instead. “We’re supposed to be resting.”

“Mhm.” Mark rolled his hips anyway. “Resting while plugged full of cock.” William buried his face in the back of Mark’s neck and groaned again, and Mark grinned. They both let the silence stretch a moment longer before dropping the next line, soft and smug.

“…We should probably cancel everything this week too.”

William blinked, his eyes fluttering. “What?”

Mark murmured, voice slow and syrupy. “It’s just starting. I’m gonna need you again. And again. And again.”

A pause, then William moved again. “... so you weren’t joking earlier.” Mark just smiled at him softly.

“We should turn off your phone, too,” he added innocently. “No interruptions. Just you. Me. Lube. And a lot of laundry for future problems.”

William groaned again, louder this time but he was hardening inside Mark already, still knotted, still locked. “You’re going to ruin me.” Mark laughed softly as he kissed him.

William woke up to heat, and it was literal heat.

Mark was curled around him like a furnace, leg thrown over his hip, grinding slowly. Deliberately. Slick already soaking them both again. William groaned into the pillow, not even opening his eyes. “Mark…”

“Mm?” Mark’s voice was all sugar and smoke.

“What time is it?” Mark kissed under his jaw, purring.

“Don’t know. Don’t care. You’re hard again.”

“I never stopped being hard. You haven’t let me sleep.” Mark rolled his hips again, and William hissed. The knot was softer now, but not by much and Mark was already grinding back onto it like he missed the pressure.

“You promised you’d take care of me,” he whispered against William’s ear. “Gonna back out already?”

William opened his eyes, half-lidded and dazed, staring into the mess of tangled sheets and bite marks and slick-coated thighs. “I need coffee.”

“No, you just need to fuck me again.” Mark’s smile was positively vicious. “C’mon,” he whispered. “Morning’s the best time to knot me. Let’s see if we can get you to stay inside this time.”

William rolled over with a groan, hands already grabbing Mark’s hips. “Fine. But after this, I’m calling in sick, we're gonna be actually resting.”

Mark laughed. “We’re not even halfway through, yet.”

Chapter Text

It was easier to convince Mark to let go than he thought. 

Will caressed the Omega's slick covered thighs, parting it gently as he looked up. "Okay Mark, listen to me for a bit, we should really tidy up," he paused, Mark already gripped his shoulders tightly, Will chuckled at the reaction. "... You're not gonna like it when it dries out, let's drink some water and clean up first, yeah?" Mark whined, still lazily grinding himself on his knot, making the other man groan at how sensitive it felt.

William pressed a kiss on his neck, trailing up to whisper in his ear. "We can loosen up, get some rest... " He ruffled the Omega's hair. "... Then maybe sneak in another round while we're at it." He smirked, inhaling the strong scent of his mate. 

Mark was already sat straight by the time he finished the sentence, he growled at the sudden shift in the position as his cock twitched inside the Omega. Mark carefully placed down a kiss on his lips, licking around the opening with a hum. Their lips collided, Will would be lying if he said he didn't enjoy it, opening his eyes and lightly tugging on Mark's head as he broke the kiss. "I'll take that as a 'yes'." Will panted heavily, catching up with his own breaths.

The apartment was thick with steam by the time they managed to get themselves both into the bathroom, William's arms still wrapped tight around Mark’s slick, warm body. Every step was a slow, deliberate battle against the knot still holding them locked together. With the help of Mark's abilities, it didn't take them too long to get to the bathroom.

William's cock swelling inside him, stretched but perfect. He set Mark gently on the edge of the tub, careful not to pull too hard, his fingers tracing slow lines along his damp skin as he traced his hand on his chest.

Mark’s eyes were heavy-lidded and mischievous already, “Careful,” he teased. 

Will grinned, stepping under the hot spray, letting water wash over them both. He reached out, pulling Mark close again, hips pressing firmly together, breath mingling with his as the water slid over their shared bodies. The knot was still swollen, and every movement made Mark gasp, a mix of pleasure and that sharp, needy ache of heat.

Will kissed along his jaw, trailing down his neck, feeling his skin shiver beneath his touch. “Think you’re ready for another round?” Will said lazily as he gave Mark a few experimental thrusts. Mark smiled, his fingers digging into the other's shoulders. “Oh, I’m ready.”

The water was warm and slippery, dripping down and mixing with the slick heat still pulsing inside. Mark was wrapped around William, still tied and knotted, the feeling so intense it made his head spin. He moved slow, careful not to hurt him, but every touch was fire—soft lips trailing over his skin, hands exploring the places only he could reach.

Mark bit his lip when he pressed harder, William's cock still swollen inside, stretching him in the best possible way. “God,” he whispered, voice thick. “I don’t think I’ll ever get enough.”

William laughed low and deep as Mark tangled his fingers in his hair, trying to pull him closer, needing the contact, that heat. The water kept pouring, steam wrapping the small room, but all he could feel was William—solid, warm, all his.

The water slid over them, hot and relentless, but Will's hands were trembling beneath Mark’s skin. The knot still stretched tight inside him, every movement sending sparks racing through his nerves. After a few moments with the water pouring over them, the knot finally died down, even if it was a little bit. It was enough for him to move further and he was still hard, finally getting past to go half-way and thrust back into his cervix. 

Mark let out a loud mewl, his fingers digging into Will's back as he tightened his grip. He was breathless against the Alpha, whispering William's name like a prayer, fingers clutching my shoulders harder. “William… please.”

The word hit him, and be could feel the storm building in his own chest. William swallowed hard, fingers tightening where they dug into Mark's waist, hips pressing deeper, trying to sink further inside and to give him what he needed. His body shuddered against him, slick and trembling, cock pulsing and stayed cozy inside. “Mark,” he gasped, “I can’t hold—”

He shook his head, eyes fierce and wet. “Don’t stop. Please.” he let go, thrusting slow but urgent, William's cock swelling hot and full inside him, knot locking in a perfect, desperate hold. His gasps filled the shower, mixing with the rain pounding against the windows.

He felt him clench, muscles tightening as the heat spilled over, dragging them both toward the edge.

“Now,” Mark begged, voice raw. As Will pushed harder, deeper, knot pulsing and locking tighter, and Mark cried out, riding the wave—another release blending with the storm.

The heat was even more unbearable than the last, wrapping him tighter, consuming every nerve as it all scream for release. William’s hands were everywhere, holding him steady, filling Mark completely, knot and all. He was drowning in sensation, breath hitching, body arching into him.

“Please,” He begged, voice broken and desperate. Will didn’t hesitate. His hips rolled harder, deeper, and the knot locked tight inside Mark, stretching and filling every part as he clung to him, screaming into the water as the pleasure crashed over him—deep, raw, endless.

When it finally slowed, all he could do was gasp for air, tangled and spent in his arms. “God,” he whispered, voice shaking. “I need you.” William kissed him, wet and fierce.

The water ran warm over the two bodies as they clung to each other, breathing hard. Mark’s slick skin pressed against him, knot still holding locked in a tight, delicious bind. His breath was ragged, lips parted, eyes shining with that raw, needy glow he loved so much.

Will traced gentle circles along his spine, careful not to pull too hard, feeling the slow pulse of satisfaction beneath his touch. “God, you’re something else,” he murmured, voice low and rough. Mark smiled, head resting against his chest as his fingers playing lazily with the hair at his nape. He whispered some sweet words, voice soft but teasing as he watched Will's face darken with blush. 

The storm outside faded to a steady drizzle, but inside the bathroom, it was just the two. Warm, tangled, and perfectly endless. Mark's body was still humming from the release, the knot inside him slowly loosening but still a delicious reminder of William’s hold. He nestled closer, savoring the feel of him—strong and steady beneath him.

He teased, voice sleepy. William’s hand stroked his hair, his smile soft. Mark grinned, feeling that slow, familiar heat starting to build again—right beneath the surface.

“Think you can handle that?” He kissed Mark's temple, warm and sure. “I’m yours. Always.” The rain softened outside, they could hear the world quieting down. 

The shower had cooled slightly, steam curling around them felt like a warm, private fog. Mark’s body pressed close, knot still nestled inside him, a perfect tether between the two. His breath was slow now, but every so often a soft shudder ran through him beneath William's touch.

He cupped his face, tracing the line of his jaw with his thumb, savoring the quiet between storms. “We’ll have to pace ourselves,” Will murmured, voice low and warm as he continue. “Weeks of this heat… we can’t burn out too fast.”

Mark’s grin was lazy, eyes half-lidded. “Pacing’s for losers,” he teased. “I’m planning to keep you busy.” Will laughed lightly, pulling him closer, lips brushing his temple. “We’ll see about that.” A slow smile spread across Mark’s face as his fingers slid down his chest, tracing teasing paths back to the knot still swelling inside him. The quiet tension thickened, electric and urgent again.

Warmth still pooled between the two, but Mark's body was already stirring again, the knot was a delicious reminder of what Will made him feel and what was coming. William’s touch was gentle, but Mark could feel that hunger building beneath his calm.

He caught Mark's hand, pulling him flush against him, voice low and teasing. William grinned, breath hitching as his hips shifted, knot stretching Mark once more.

The rain outside had slowed to a murmur, but inside, the heat was rising fast—ready to crash again.

Mark’s fingers were light but relentless, tracing over William's chest, slipping lower with every breath. The knot inside him still stretched him wide, reminding how they were bound and needy. Mark let out a low groan as his nails raked softly, teasing skin that had barely cooled from before.

“God, you’re driving me crazy,” William muttered, voice rough and hungry. His grin was wicked, eyes sparkling with mischief. “Good. That means I’m doing my job.” Will caught his wrist, pulling his hand to his lips as he suck a fingertip slow and deliberate. “Maybe I should make you beg.” Mark’s breath hitched, hips pressing harder. “Try me.”

William’s lips on his skin were firm, the knot was still there, swollen and aching, and every move pushed me closer to the edge again. “Beg?” Mark teased in a playful voice, low and dangerous. William smiled, dark and hungry. “Yes. Beg.”

Mark bit his lip, body trembling with need as he consider trying to keep up the act or fully submit to him. “Please… William… I want you—need you…” His hands tightened on his hips, gasps between breaths, cock pulsing deep inside, and he shuddered. “That’s better.” The heat was rising fast again, slow burn turning into a wildfire.

Mark’s eyes held dark and daring, as his fingers teased just beneath Will's shirt, barely grazing, leaving trails of fire in their wake. The knot inside him stretched him tight, a constant reminder that this was only the beginning. Mark breathed slow, savoring the way his touch made hus skin crawl, the way his voice lowered to a whisper that sent shivers down his spine. “You like pushing me, don’t you?” William murmured, voice thick with wanting.

His grin was wicked, slow and deliberate. “Only when it gets you this worked up.” Will pressed my forehead to his, hips barely shifting, knot still buried deep, and the tension between them coiled tighter than ever. He chuckled, warm breath against his lips.

William’s breath was heavy, voice low and rough, and every inch inside was screaming for release, but he wasn’t ready to give him that victory yet. His hands drifted over Mark's chest, teasing, taunting, never quite settling. “You’re on edge,” he whispered, voice thick with promise. “So am I.” His eyes darkened, burning with want that matched the Omega's.

“Then what are we waiting for?” He smiled, slow and knowing. “The best part.” The knot pulsed deep, heat building like a coil ready to snap, but they held it, the delicious ache stretching on, unbearable and intoxicating all at once.

The ache inside him was sharp, twisting tighter with every breath. Mark’s touch was everywhere, light and teasing, but beneath it all was that knot—swollen, stretched, impossible to ignore. It pulled at him like a live wire, sparking every nerve.

He tried to hold back, he really did. When his fingers trailed low, brushing over his ribs, Will gasped and lost control as he grabbed him, pulled him flush against his body. His hips thrusting deep, the knot locking together so perfectly he felt like he might shatter. His breath hitched, and he felt Mark clench down on him with a loud moan, tight and wild, matching the desperation.

“Please,” he whispered, voice trembling. That was all Will needed before he gave in, pushing harder, faster, the heat roaring through him, the knot pulsing again, binding them in a fiery, frantic rhythm. The world narrowed to just right, the rain pounding outside, gasps mingling in the steam, skin slick and burning.

William had lost control, lost himself in his Omega, in the need that refused to be denied. And when they finally broke, it was a wild, deeper and desperate release, raw and perfect. They collapsed, William's head rested on Mark's shoulder as he pressed his body against the bathroom wall, tangled and trembling, the storm outside finally matching the calm inside.

Chapter Text

Mark didn’t wait long. Still knotted and trembling, William barely had time to catch his breath before Mark began to move again. His hips rocked faintly, his softening dick already threatening to stiffen from the friction. Will sucked in a breath, it wasn’t rough, not yet. Just the kind of restless hunger that meant Mark’s omega body was already winding up for another round, uncaring of how raw or swollen either of them might be.

William groaned, low and exhausted, planting his palms on either side of his hips. “Jesus, Mark. Again?”

Mark’s lips brushed his ear, his back arching with a quiet inhale. “One more.”

It was never just one, and they both knew it. William sighed and tightened his grip. “... You promised we’d clean up.” His tone was teasing as he reached up to cup Mark’s cheek. With water sliding down their bodies, Will gently pulled out, guiding Mark into a soft rub along his spine, lathering his back with soap, then working shampoo through his black hair. “How’s that?” Will purred, massaging Mark’s bigger frame.

“...Smells just like you,” Mark murmured, resting a hand on William’s shoulder before mirroring the gesture, running soap over his alpha’s chest, his face reddening as he tried to ignore the warmth rising in him again.

After a quick rinse, William gave Mark a sly smile and leaned in, pushing until Mark’s chest pressed against his. “Let’s take care of this one next, yeah?” His hand trailed down Mark’s back, stopping under the curve of his plump ass. He slid a hand between his thighs, exposing the used, tender slit where William’s cum was slowly dripping onto the tiles. Mark gasped softly, biting his lip and burying his face against Will’s shoulder, trying to think of something to say before—

Ping.

The sound neither of them wanted. Mark’s communicator lit up. Cecil’s voice crackled through. They both froze, Mark met Will’s eyes with a glare full of resentment, then shifted, guiding William’s hand deeper into him with a soft moan. “It’s been a long week. He couldn’t even let me rest.”

Then another ping was dispatched, a second alert, with a much more urgent matter that leaves Mark grunting. Followed by a clipped voice of Cecil crackling through the speaker: “Invincible, status report. We’ve got a breach. We need you airborne in the next two minutes.”

Mark rolled his eyes. The fog on the glass hadn’t faded, and the heat in his chest surged again. He stared at the communicator, then down at his thighs, slick still slowly oozing out around the base of it. “Two minutes,” William mocked. “They’re dreaming.”

Mark whimpered and rocked his hips indecisively. “I can’t go like this—”

“You definitely can,” William said, voice hoarse and hand trembling slightly. “Probably stronger than ever.”

Mark groaned and pressed his face into Will’s neck. “You’re not helping.”

“You want to finish, or go to some interdimensional brawl dripping my cum and reeking of sex?”

“That’s the problem!” Mark snapped, fists clenching.

Another buzz. This time: “Thirty seconds.” Mark swore, heat blazing under his skin again as he pushed himself out of Will’s grasp, letting William slip free and leaving a slick trail down the inside of his thighs, Will quietly whistled at the sight.

“Fuck it,” Mark hissed, voice thick. “You better make it worth it when I get back.”

And with that, he dragged on his uniform. He didn’t even put on underwear, doubt that he found one that wasn’t dirty but at least his suit covers most of it up, not even bothering to clean up fully and water was still wet on his skin. The stains would be visible, the scent would be impossible to hide. But his eyes were glowing, his skin shimmered like it had been supercharged.

William propped himself up on one elbow, watching the mess between Mark’s legs as he adjusted his gear. “You’re gonna come back needing ten more rounds, huh?”

Mark turned at the door, cheeks flushed, but smirking. “I’m already leaking your second load. You really think I’m gonna stop at ten?” And then he vanished into the clearing rain, leaving the apartment heavy with the scent of heat and need. ‘He wasn’t serious, was he?’ Will silently whispers to himself as he watches the rainy skies slowly clearing, cloud dispersing.

Suddenly, everything was quiet. Mark’s scent faded, and for a moment, Will’s mind cleared. Without the fog of pheromones, reality hit him like a truck. His body trembled, he stepped out of the shower on shaking legs. “...What the hell did I just do?”

Later, standing in the kitchen with a towel slung low around his hips, a half-spilled cup of coffee on the counter, William stared around the wrecked apartment. The bed was a mess, towels were still soaked on the floor, he hadn’t even cleaned up. The thought that he lost control just from Mark’s scent… That he might’ve knocked him up on his first heat made him swallow hard.

And worst of all? He was already half-hard again just thinking about it. The image of Mark mid-fight, dripping, slick, glowing with heat… it short-circuited his brain. “Christ,” he muttered, palming himself absently.

After a few minutes of spiraling, he shook his head and forced himself to focus. “...I need to clear my head.” He got dressed, scribbled a short list, and left for the store.

The cashier eyed him the whole time as she scanned the items: electrolyte drinks, lube, protein bars, towels, ice packs, a big box of condoms, and contraceptive pills… just in case.

William blinked at her, offered a dumb smile, then glanced at his phone to break eye contact. There he saw a half-blurred image on the news feed popped up, it was none other than Mark, mid-flight. His face flushed and body slick with rain and blood and something else.

The reporter’s voice trembled: “Invincible appears… significantly stronger than usual. Hostile forces are reportedly retreating—” Will shut off his phone and paid without another word, heading straight back home.

Mark tore through the sky like a comet, sweat clinging beneath his too-tight suit. He could still feel William on him, inside him. Every twitch of his hips sent aftershocks down his spine. The rush of air didn’t cool him, it only made the fire worse.

He landed like a missile, fists crackling with kinetic force. His body hummed with unnatural power. The breach was already a disaster from the start, interdimensional creatures spilling out like it was never ending, explosions rocked a random planet, someone shouted his name in the distance. He didn’t care. Whatever this was, he was ready. He barreled forward with feral force, teeth bared, instincts sharper than ever. Every punch hit like a bomb. His scent was thick, raw, claimed, and unmistakable.

He could see it in their eyes: confusion, awe, maybe even arousal. ‘Let them wonder,’ he thought. His thighs were soaked. His abs flexed with every breath. A few more drops slid down his legs as he dodged another blast. Shame mixed with power made his mind reel. He bit his lip until it bled.

Time blurred. Earth didn’t even feel normal anymore. His senses were overclocked. His body ached as sensitive to every shift, every breath. His scent clung to the rubble, to the bodies. It saturated the air.  His senses were hyper-sharp, hypersensitive, skin ached for touch, for friction. His core clenched every time he shifted his weight, and his scent—god, his scent was everywhere. It clung to the monsters he tore apart, soaked into the rubble, and hit every bystander and teammate like a wall.

The air reeked of alpha. No, not just any alpha. An alpha’s scent on a claimed omega. And Mark felt the eyes on him. Half the heroes on the scene were subtly avoiding him now, some red in the face, others confused. He was snarling without realizing it, protective and furious and starving. His thighs were soaked again, but he kept closing his thighs, trying to stay focused, but—

He ducked an energy blast, then punched straight through the creature’s chest, breathing hard. His communicator crackled. Atom Eve, voice tight and cautious through the radio: “Invincible. Do you need backup?”

“No,” Mark said, a little bit too fast.

“You’re... not hurt, are you?”

“I said I’ve got it.”

He landed beside her, dust curling off his skin. His suit tore at the hips and thighs almost teasingly. Drenched in his scent rolled off him like a heat wave. Eve turned red and looked away. “Right. Uh… I guess your heat really does make you stronger.” Mark gave a low sound—part growl, part whimper. He forgot Eve was an alpha too. Not any better than William, but close enough to trigger a defensive instinct.

“Stronger. But distracted,” Eve added carefully. Mark didn’t answer, didn’t wait for a minute before he took off the moment the cleanup crew arrived, fists clenched, blood crusted on his skin, slick still leaking down his thighs.

He barely passed the city limits before his hips jerked again, breath catching. His scent rolled thick around him, parting the clouds. He cursed, voice low, body burning. Home was the only word that mattered now.

Chapter Text

William sat on the couch in nothing but his boxers, legs splayed, hair damp from a recent shower that had done nothing to cool him off. His cock twitched lazily against his thigh, half-hard and stubborn, already threatening to wake again at the thought of Mark landing any second now.

The news stream still ran on silent in the background: footage of Invincible streaking across the skyline, eyes glowing, face flushed, he looked wild. Dangerous, and undeniably fucked was the best William could describe him. The last image before the feed cut was Mark mid-punch, his suit clinging to slick thighs, part of it torn wide over his hip, and the curve of his ass.

William groaned into his hand, turning off the TV then shifted his head to the rest of the room, he’d already stripped the bed and neatly remade it, getting up from the couch and went to the kitchen to quickly freshen up. He already knew that in his case, it didn’t matter, Mark was going to ignore all of that and throw him against the nearest surface, but it was a noble gesture. 

William didn’t mind it. He still felt it, still pulsed open at the thought of it happening again. His skin felt too thin, he hadn’t been this keyed up since the first days of college.

But Mark’s scent still lingered everywhere.

The only reason he wasn’t curled up in Mark’s room, face buried in the sheets, was because he was trying to respect boundaries. Post-rut cooldown time, he was only human. And he also wanted Mark to come home to something soft and safe after a rough battle. Not a needy Alpha with a hard-on who’d tackle him the second the door opened, or vice versa.

He’d made coffee, set out fresh water, folded the laundry, and even put on a dumb shirt Mark liked, the one with the Seance Dog image plastered on it. The rain had finally stopped, the apartment was quiet… and eerily so, compared to the whirlwind it had been earlier. 

William sat curled on the couch, promptly wrapped in a soft hoodie with a similar graphic of Mark’s favorite character, and a half-eaten protein bar resting on the coffee table beside him. The scent was faint now, just a trace of his omega’s pheromones. It clung to the couch cushions, his hoodie, probably the entire apartment, if he was being honest. But it wasn’t active, not like before. Without Mark here, without his body flush against William’s and writhing with need, the scent was just… residual. 

And without it flaring full-force into his system like a drug, William could think clearly for the first time in hours. “Jesus,” he muttered, head tipping back on the couch as he ran a hand through his hair. “So this is what sobriety feels like.”

It didn’t mean he was unaffected. He still felt the heat of earlier, the memory of Mark’s hips rocking against him and the wet, clenching heat that had nearly broken his restraint. But now, the room was cooler. Calmer. Empty.

A small, guilty smile tugged at his lips as the memories flash through his mind, his face reddened. “Alright. So maybe I lost control a little,” he whispered to himself, voice quiet but warm. “But you did try to say no to a needy omega who literally begs for just one more. That’s progress.”

He shook his head, flushing slightly at the memory and then paused as he caught another drift of scent from the hoodie he was wearing. Reflexively, he turned his head away, face scrunched. “Nope. Nope, I am not falling for that again. I’m a composed, respectable alpha.” He grabbed the throw pillow and pressed it to his face, trying not to smell it, to not smell anything just for good measure. Then, with a sigh, he leaned back again and muttered, softer this time, “…Come home soon, though, yeah?”

And even though the fog was gone, and the heat had simmered down, William’s pulse still kicked a little harder when he thought about Mark returning. Still glowing, flushed, probably dripping and furious and pretending he wasn’t still halfway to another round, a part of him still missed how he left him hanging mid-sex. William groaned, dragging the pillow back over his face again.

…But the second he heard keys at the door, every inch of him sat up and alert, his breath hitched. He sighed, trying to act normal, calm, affectionate. It was barely a sound, but William heard it instantly. The unmistakeable sound of Mark coming back home, the slide of boots, all quiet, uneven breath just past the frame.

Then came the scent filled the room again, making William forcibly hold back his breath and turned his head away. It hit him like a warm wave, richer than before. Tired, flushed, a little burnt around the edges, it was damp with sweat, leftover rain and adrenaline. But it was still his Mark. William sat up on the couch, heart already pounding, his hoodie stretched loose around his shoulders. He kept his breathing shallow. ‘Don’t inhale. Don’t do it.’ he chanted in his mind. His body remembered everything too vividly.

Mark stepped inside, dripping wet, his suit peeled halfway down his torso, threathening to expose his chest. His eyes glowed faintly, lips parted, cheeks flushed, steam practically rising off his skin, he looked wrecked. “Hey,” he breathed, voice raw and a little hoarse, leaning his body on a wall. “I’m back.”

William smiled softly, even as his throat tightened. “Yeah. I can tell.”

Mark crossed the room and collapsed into William’s arms the second they opened for him without hesitation, pressing his body of heat, exhausted onto William. He clung to William’s hoodie with one fist, buried his face in the crook of his neck, and sighed as if it was the first breath he could actually relax into, William smelled like home.

Will held him back, his arms strong and steady. His lips kissed Mark’s temple, “Easy,” Will murmured. 

Mark mumbled against his collar, voice sleep-heavy, though a little smile tugged at the edge of it. “Did you miss me?” William huffed a soft laugh, brushing his fingers through Mark’s damp hair. 

“What kind of question is that?” Mark shifted, face pressing closer. And for a moment, his hips gave the smallest roll, subtle but hungry scent creeping in. “Don’t,” Will said suddenly, almost in a panic, placing a gentle but firm grip on Mark’s wrist.

Mark blinked, pausing mid-motion, caught off guard. “…Don’t?”

Will’s jaw clenched. He kissed Mark’s hair again, arms still wrapped around him. “Just… not right now, okay? I can’t—I want to. You know I do. But if I breathe you in too deep right now, I’m gonna ruin that whole gentleman thing I was trying to do while you were gone.”

Mark was quiet for a moment, and then he surprised William by laughing. Soft, warm, breathy against his skin. “You were trying to?”

“I was trying to be a good boyfriend,” Will groaned, pulling back just enough to meet Mark’s eyes. His face was flushed. “You’re just… you.”

Mark's eyes glinted, mischief and affection. His fingers slid up to cup William’s face. “Aren’t you cute.” he purred, placing a kiss on his cheek.

Will didn’t answer. He leaned forward and kissed Mark again, but this time slower in a calmer manner. Their lips brushing gently, hands steady against Mark’s back, holding him steady. Mark sighed, pressing their foreheads together afterward. His teasing eased into something else. “...I can calm down. If you want.”

Will raised an eyebrow. “Yeah?”

Mark nodded, voice quieter now. “I’m tired. Still full of energy, the heat’s killing me, but… I don’t need to push it right now.”

Will closed his eyes, exhaling a shaky breath, finally letting himself inhale just a little of Mark’s scent. “Okay. Then let’s just stay like this for a bit.”

Mark curled up against him on the couch, legs folded to the side, arms still around Will’s chest. They sat together in silence, only the hum of the TV and the occasional brush of William’s fingers through Mark’s hair breaking the stillness.

For the first time that day, William wasn’t fighting his instincts. He was just holding his omega, and Mark wasn’t asking for anything more, not yet. 

A couple of moments passed by, William excused himself to make another cup of coffee along with planning their dinner. 

Mark sat on the couch wrapped in a blanket and nothing else, sipping on what might have been coffee if Will hadn’t watered it down with a small spoonful of electrolyte mix, it didn’t taste as bad as he’d thought. Mark was still sore, also still blushing from earlier, the warmth of his boyfriend had calmed him down. He leaned closer to the table and grabbed his phone, searching through his contact list.

Click.

“Mark?” Debbie’s voice, calm and sharp all at once on the other side of the line. “Sweetheart, are you okay?”

“Kinda,” Mark muttered. “I—uh. Just checking in. Everything good?”

Debbie gave a small hum, and there was a pause. “I’ve seen the news, honey.”

“... Oh.”

“Don’t worry, I know you’re going through some tough times lately, I’m here to help if you need me.” 

“...Thanks mom,” he paused, 

“Tell you what, let’s talk over this over coffee… and invite your boyfriend over too, so we can talk this out together if you both need advice.”

“How’d you know— ah.” Mark chuckled, and Debbie hummed again.

“I figured you need something to take your mind off,” Another beat passed, then: “But while we’re here—have you and your Alpha talked about contraception yet?”

Mark almost dropped the phone. “MOM—”

“I’m serious. Your father and I were young once. And just because you have superpowers doesn’t mean you’re exempt from biology.”

“I… I can’t have this conversation right now—”

Debbie was mercifully silent. “... I know you’re experiencing your first heat, it must be so overwhelming for you.”

“huh?”

Debbie smiled, “Eve stopped by and told me about it, and William informed me about your symptoms, he’s trying his best.”

silence filled the room, a part of him wanted to confront Will about it first.

“You’re in heat, Mark. It’s exactly the time to have this conversation. If you’re not ready for a baby, say so. Tell your boyfriend and figure out what you’re doing about that before it’s too late.”

“...”

“Tell William I said hello. And remember to buy plan B. You never know what your powers might decide to do.”

“About that…”

“... You weren’t using any contraceptives, were you?” Debbie sighed.

Mark groaned into the phone, looking up to see William coming out of the kitchen with a set of meals and drinks. “I have to go,” Mark whispered on the phone, taking a small breath, “I’ll call you back later.”

Debbie sighed again, “I love you.”

Mark smiled, answering back in a playful tone. “Yeah, yeah, I love you too.” 

William coughed awkwardly, breaking the room’s silence for the two before he hung up. He had already placed down the plate of mixed leftovers and pasta with his own recipe, now burying his head on Mark’s shoulder and sighed softly, breathing the calming scent. “Who’s on the phone just now?” Will gripped Mark’s blanket, a hand lazily tracing under it and rested on his waist.

“It was my mom, she said hello.”

Chapter Text

The room was cold and sterile. The metal humming with screens that blinked and updated with data feeds, seismic readouts, and global heat signatures. At the very center of the room stood Cecil Stedman with his arms folded, jaw clenched tight as he inspected the paused recording on the main screen. 

“Play it again,” he ordered.

With a click, the screen replayed the footage from just hours ago. Mark was blazing across the skyline just on the tail end of a skirmish above ground placing a punch to the unclassified alien space ship that was just breaching the ozone layer, he tore through the hard metal, took a direct hit to the chest when they attacked him, and didn’t even flinch. With a low, almost pleasured hum in his chest, he wiped blood off his lips and dusted off the debris off his chest. 

Another screen to the left showed his biological readouts in real time, temperature off the charts, scent radius expanding fast, hormone levels flagged in red. “Sir,” the medic chimed in nervously. “We’re… we’re seeing something unprecedented. His body’s responding to the hormonal cycle like a secondary catalyst. He’s producing exponential energy under stress, especially when agitated or stimulated. We’ve never seen anything like it.”

“... Because no other omega ever had Viltrumite DNA,” Cecil muttered under his breath.

The sensors showed a spike in kinetic energy far beyond his usual baseline. His vitals had been… erratic. Unlike expecting the unstable element, Cecil raised his brow when the results came in as supercharged. Mark was already signaling his strength passed beyond limit, a small ping alerted the other workers.

“Where’s that spike coming from?” Cecil asked, but he already knew the answer. Still, protocol demanded the illusion of doubt.

One tech cleared her throat. “It’s… hormonal, sir. At first, we thought it was stress-related. But there’s a marked increase in scent markers consistent with a recent heat. And he’s not suppressing it at all, it seems to be affecting the nature of the aliens attacking, taking it to his advantage."

Cecil raised an eyebrow. “And this is the result?”

Cecil stood with his hands clasped behind his back, staring at the footage in silence as Mark tore through another wave of extradimensional threats with ease. There was no hesitation in his body, no faltering in his blows. But his heat signature was... erratic, spiking in pulses and lingering in places it shouldn’t be.

One of the younger analysts cleared his throat. “Sir, uh... you’re seeing the same thing I am, right?”

“I’m seeing it,” Cecil said, his voice flat.

A pause was shared before one analyst coughed. “The scent field,” the analyst continued hesitantly. “It’s—expanding, both biologically and… tactically. He’s using it, whether he means to or not. Some of the creatures were visibly affected by it. Their movements were deemed slower, and confused while avoiding direct contact with Invincible.”

Another feed loaded shortly after, battlefield visuals. Mark’s punches left shockwaves and creatures collapsed before they made contact. Anyone within ten feet of him visibly flinched or flushed, including half of the GDA cleanup crew after his absence.

Cecil didn’t blink. “Pull surveillance from before deployment. The apartment cams. Audio, too.”

There was a tense pause, some staff were looking away politely. “Sir, we—uh. There’s… a lot of interference. The scent-masking is fog-like, with heat distortion, thermal bloom are off the charts. I don’t think we were supposed to see anything from that close range.” 

“Oh, we weren’t,” Cecil muttered. “But we are now.”

The screen flickered as low-quality visuals appeared on screen at first, then clearer audio followed with a small gasp, then a moan, the unmistakable rhythm of bodies in sync. It was clear of what was happening, someone swore under their breath, while another analyst averted their gaze.

“Turn the sound off,” Cecil said calmly. “We’re not here to jerk off. I want timestamps, from first spike to peak output. I want to know what lit that match and how long it burns.” Cecil tapped the desk, leaning in closer as his eyes trailed the data.

“Sir…” a younger operative hesitated, cheeks slightly pink. “He didn’t even cool down before launching. He was still—uh, producing omega slick. There were traces all over his uniform, one of the street drones picked up a visible trail and the clean up crew confirmed it.”

Cecil said nothing. His eyes lingered on a still frame: Mark’s face, flushed, focused yet powerful enough to knock an entire rift back into its own dimension with blood and come still on his thighs.

“... Interesting.” He paused, hangs clenching and unclenching behind him. “We need more than observation,” Cecil said darkly, stepping away. “Prep a secondary team. I want hormone profiles, residual scent samples, pheromone ratios logged from every point of contact on that field.”

“Sir, wouldn’t that violate—”

“Don’t care,” Cecil snapped. “If that heat cycle altered Invincible’s strength, we have to know how… and what triggers it. Whether it’s a permanent shift, or… tied to something else that could be dangerous.”

His eyes flicked briefly toward the monitor again, watching the outline of Mark’s body curl tighter around the alpha beside him. Although the image was slightly blurred by the fog, it left little to the imagination. The moment was peaceful, still, it's vulnerable. “Keep eyes on him. Especially after contact with his mate, I want data the second he spikes again, once the heat becomes more erratic than normal.”

“Understood.”

Cecil exhaled and rubbed the bridge of his nose. “If what we saw today was a preview… we’re not looking at just a stronger hero.”

He looked back at the screen. Mark’s soft silhouette resting against William’s. “We could be looking at a biological weapon that doesn’t even know what it’s capable of yet.”

The screen pulsed, Mark entering the atmosphere left a heat trail twice the length of standard orbital entry. The AI beeped softly as it highlighted areas on the scan: abdominal region, glands near the neck, nerve clusters lit up. A surge with a pattern of release and feedback, similar to an adrenaline spike, but… hormonal and in his biological nature.

“Run comparison: last recorded spar with Omni-Man,” Cecil added, gaze stayed firm on his statement. “Match for aggression markers, power limiters, and reaction time.”

The screen split into two: Mark during a supervised fight since the Chicago incident. His moves were predictable. Sharp, but steady. Then compared to today: he was faster, and not just moving faster without thinking, he was also processing fights faster. There was no wasted motion, strategizing his instinct and impact.

“Sir,” a technician finally said, quietly, “his baseline has shifted.”

“No shit,” Cecil muttered. He pinched the bridge of his nose. “Pull DNA scans from the last debrief. Cross-check with hormonal data. I want to know exactly what triggered this spike, and how long we’ve got before it either burns him out or becomes permanent.”

Donald finally entered the room with a small stack of files in his hand, hesitating at the data displayed. “Do you think he’s… stable?”

Cecil didn’t answer right away. The next screen showed a still from the battle, Mark’s body mid-strike, steam rising from his skin, uniform tight and drenched with something the sensors flagged as non-combat fluid, definitely not blood.

“…I think we’re past stable, for now,” he said finally. “We’re seeing something evolutionary in real time.”

He tapped the side of the monitor. “Keep surveillance active. Don’t engage yet. If this is only heat-related, we’re not interfering unless he loses control or starts affecting civvies. But keep your eyes on him.” He paused, glancing at William's files, “... And that boy too. If the alpha’s the stabilizer—”

“You want him tagged?” Donald interrupted.

“Not yet. But we need leverage, let's do it quietly.” The lights in the control room dimmed again as the footage looped. Onscreen, Mark turned mid-flight, hips twitching, breath fogging the air. The power wasn’t just in his muscles, it was in the scent. In the way every living thing around him reacted, forcing into either submission, curiosity, lust, or fear.

Cecil watched silently, eyes narrowing. “…God help us if he ever learns to weaponize that.”

A silence hung thick in the air. Then Cecil straightened his posture, looking back at other analysts then back to Donald. “Compile everything we know. Invincible’s bloodwork, pheromone saturation, and kinetic readings. Then we'll cross-reference it with historical heat events, and not just Viltrumite; everything we’ve ever archived, even obscure shit. I want to know if this is a one-time fluke or the beginning of something bigger.”

“What should we do about the source?” one operative asked. 

Cecil’s expression didn’t change. “Not yet. We let him think he’s still beneath our notice. But keep eyes on him constantly. If this… symbiosis strengthens Mark, we let it ride. But if it turns volatile—”

A long pause. Donald adjusted his glasses while Cecil pinched the bridge of his enose. “...we’ll have to neutralize the trigger.”

The room chilled as it fell into silence, no one dared to speak again. The only sound was the soft hum of monitors, and data compiling Invincible’s scent trails, hormone spikes, the smear of heat between duty and desire.

Chapter Text

Mark was tucked under William’s arm on the couch, dressed in nothing but Will’s old shirt and a fresh pair of sweats. His damp curls had finally dried into soft waves, and he smelled like home , a faint trace of ozone that hadn’t burned off from the fight.

They were halfway through a re-run of some dumb reality show neither of them cared about, maybe William did, just a little bit. Though it was just background noise for the way Mark’s fingers gently traced along Will’s ribs while Will lazily fed him pieces of dinner off a shared plate.

“Open up,” Will said softly, holding a bite of pasta toward him. Mark blinked slowly, lips parting with a pleased hum as he leaned in. “Mmm,” he murmured around the bite. “You should feed me more often.”

“Don’t push your luck,” Will said, but his voice was all warmth. His hand ran over Mark’s thigh in lazy strokes, grounding them both. The scent of heat still lingered, it was faint but manageable. Will had opened a window earlier, enough to keep himself grounded, it helped for a while. Mark wasn’t actively triggering him anymore, just there , soft and curled around him like the world didn’t expect him to be anything else.

They ate in silence for a while, Mark reaching over to steal something from Will’s side of the plate, then pretending he didn’t. Will side-eyed him. “You want your own plate?”

“No,” Mark said immediately, cheeks puffed a little with another bite. “Yours tastes better.”

Will rolled his eyes and pressed a kiss to Mark’s temple. “That’s because I cooked it.”

“Mmm. Hot.” Will chuckled at Mark’s response. Eventually, the plate was empty and Mark was full, arms winding around Will’s waist again like gravity itself had decided Will was the center of the universe. He nuzzled close, tucking his nose into Will’s neck with a pleased sigh. Still warm and humming with leftover energy, yet it was also calm.

“I like this,” Mark murmured. “Same,” Will said. Mark gave him a look, then a soft, crooked smile. They both laughed, the kind of breathless laughter that left Will’s chest full and Mark’s lashes fluttering, and neither of them moved for a while.

Just two love drunk idiots on a couch. Mark’s hand settled over Will’s chest, thumb rubbing absent circles. “Thanks for taking care of me. Even when I’m… kinda impossible.”

Will immediately turned to kiss him, soft and deep, like he meant it. “You’re not impossible.”

Mark’s smile bloomed, Will only laughed harder and tugged him closer, blanket draped over both of them. Tonight, Mark smelled like warmth, and Will didn’t have to hold his breath anymore. The plate was empty, the show was forgotten, and for a few glorious minutes, everything felt… normal.

Mark lay draped over William’s chest, his fingers trailing little idle circles down Will’s stomach. But the moment his palm dipped under the hem of Will’s shirt, his scent spiked, sharp, sweet, and dangerous . Will flinched like he’d been hit with a memory. The kind that came with slick thighs, breathy moans, and Mark crying his name against the tile.

“…Mark,” he warned.

“Hmm?” Mark blinked up at him innocently, lips parted, cheeks warm. Too warm for comfort. Will felt the shift instantly, the way Mark’s body was curling just a little tighter against him. His skin had started to sweat again, that telltale shimmer along his cheekbones was back along with the feverish blush. And the scent was creeping in again. “I think another wave’s coming,” Mark whispered, voice soft but low with implication. “I can feel it.”

Will swallowed thickly, murmuring softly "... you think?", adjusting the blanket like it might help. It didn’t. “Then you need to keep still.”

Mark grinned, slow and dangerous. “You’re the one letting me lie on top of you. I can feel your heartbeat… and other things.”

Will glared, face flushed. “Mark.”

“I’m just saying…” Mark sat up slightly, straddling Will’s hips now, pressing down with just enough weight to make Will twitch. “We could go again.”

Will covered his face with a groan. “We’re not going again.”

Mark leaned closer, their noses almost touching. “You sure? Because I did talk to my mom earlier.”

Will blinked, “She asked if I was being safe. Said I should probably look into birth control until I’m ready to settle down. You know. Adult things.”

Will stared at him, deadpan. “Mark. We’ve been raw-dogging since day one."

Mark’s smile widened.

“It’s a little late for ‘being safe.’”

“Hey,” Mark teased, shifting his hips just a little—enough to make Will twitch again. “You could’ve stopped me.”

Will’s hand shot out and grabbed Mark’s waist firmly, halting the movement. “Don’t even try it.”

Mark melted into the grip with a pleased little sound, but Will kept his face neutral.

“…That’s why I bought some stuff, actually,” Will added dryly. “Went to the store this morning. Got drinks, towels, a bunch of junk for recovery. Condoms. Pills.”

Mark snorted. “How romantic.”

“It’s preventative, I’d like to take the credit . ” Will’s tone was flat. “Because you’re insane and I need to not knock you up.”

Mark was trying so hard not to laugh. “So responsible,” he purred, leaning down to nip at Will’s neck, just light enough to leave a little heat behind. “Bet you were blushing the whole time checking out.”

“I was .” That got a small wheeze out of Mark. “Okay. Okay. That’s fair.”

Will sighed and sat up, easing Mark into his lap instead and tucking the blanket more securely around them. “You’re burning up again.”

“I’m trying not to be,” Mark whispered. “But it’s hard when you smell like that and talk like that and take care of me like that— ”

Will kissed him, soft and slow. It was a warning and a promise all at once. “We’re watching the rest of the show,” he said afterward, calmly, as if Mark hadn’t just made him half-hard under the blanket.

Mark looked at him with pleading eyes and groaned. “You’re no fun.” Mark pouted. “Well, you better save your strength if that’s your choice.”

“Why’s that?”

“Because if we don’t do it now, the next wave’s gonna be worse,” Mark said, curling back into him with a smug little sigh. “And I plan to be very difficult tomorrow.” Will didn’t answer at first. He just stared at the screen, jaw clenched with one arm wrapped around his radiating, writhing, heat-slicked boyfriend. He really needed to make a very difficult choice at that moment.