Archive of Our Own ^beta

In the ABO universe, Alphas, Betas, and Omegas coexist in a society where biological roles are inescapable. Omegas are the fertile bodies, and to many Alphas, they are considered property. Heat is the apex of Omega biology: an extreme state of arousal where the body begs, pleads, screams for mating. It’s instinctual, and for some — Omegas without a partner — it's unbearable.

Kate Bishop grew up under the weight of that genetics. Diagnosed as an omega from an early age, she spent her entire life denying that side of herself. Medication, blockers, strict diet control. Her life was built around avoiding what she was.

Yelena Belova, on the other hand, never denied her nature. Alpha by birth. She believed in control. In taming the instinct. But she also believed Omegas were made to be protected and used. Not out of cruelty, but out of function. It was the natural order of things. It was biology. It was inevitable.

Kate and Yelena were best friends.

But when Kate’s first heat came, everything changed.

[...]

The scent started as something distant.

Kate noticed it first on her tongue — a metallic, sweet taste, like blood and honey mixed. Then came the heat, rising from her thighs to her stomach. By the time she understood, it was already too late.

Her first heat.

She was paralyzed in the bathroom of the empty apartment, trembling hands gripping the sink. In the mirror, her reflection looked strange — flushed skin, dilated pupils, excess saliva, a pulsing heat between her legs. No. Not now. The blockers were supposed to work. The doctors swore she was “atypical,” that she might never go through it.

But her body betrayed every promise.

Kate tried to rationalize while she still could:

1. Call her mom? — Out of town, useless.

Or

2. Wait it out? — The first heat without a mate lasts for days. Days of agony. And she was alone in the small apartment, the chances of an Alpha catching her scent and breaking in were high.

Then reality hit her like a punch. She didn’t have a mark.

The scent was getting stronger. In hours, any Alpha within blocks would smell it. And they would come. And…

No.

She dressed in a hurry and ran to the only place where she might be safe.

The knock on the door was frantic, desperate. Three rapid, loud bangs.

Yelena approached the door with her body tense, already catching the scent before even opening it. When she did, Kate collapsed against her, thin fingers grabbing the Alpha’s shirt.

“Please…” Kate’s voice came out broken, lips trembling. “It hurts! I can’t take it anymore.”

The scent.

Sweet.

Overwhelming.

Yelena clenched her teeth so tightly she heard the bones in her jaw creak. Her cock was already throbbing against her pants, hard and heavy, pulsing with every breath Kate let out.

“You shouldn’t have come here.” Yelena growled, pushing Kate back with both hands on her shoulders, as if holding back a dangerous animal. “Not like this.”

Kate shook her head, eyes glassy with tears, pleading for help Yelena knew she couldn’t give.

“I have nowhere else to go.” she swallowed hard, her hands moving up to cover her own neck. “You’re the only one I trust. Please, you have to help me, Lena!”

Stupid.

So naive.

“You don’t get it, do you?” she laughed, a dry, humorless sound, digging her nails into her own palms, fighting for control. “I’m not different from them, Kate. I’m an Alpha too.”

The scent was getting worse.

Kate was soaked.

Yelena saw the wetness trailing down her thighs, staining the insides of her pants, and her cock throbbed with a primal desire that almost brought her to her knees.

“Leave.” she ordered, turning her back. “While I can still control myself.”

But Kate didn’t move.

“I’m not leaving.” she whispered, feet sliding forward, invading Yelena’s space. “You wouldn’t do this to me. I know you wouldn’t.”

Yelena turned with a growl that didn’t sound human, her eyes pitch black, pupils blown wide.

Kate finally understood.

She stepped back.

“Y-Yelena?”

Too late.

Yelena moved forward like an animal, her hands grabbing Kate by the hips and throwing her against the wall with a thud that made the brunette tremble. She was so hard it hurt, throbbing against her pants, and she no longer cared to hide it.

"Stubborn Omega." she whispered, her voice hoarse and distorted, while one of her hands moved down, tearing Kate's pants like paper.

Kate screamed when Yelena's fingers found her — dripping, so hot and receptive.

"No!" Screamed, trying to push Yelena away, but her Omega body was already arching, her hips moving on their own against the alpha's hand. The blonde moved her hand away only to open her own pants, ripping off her underwear so fast Kate barely had time to process the actions.

The Alpha's cock was finally freed, swollen and red, the head already glistening with pre-cum.

Yelena grabbed Kate's arm with enough force to leave marks, dragging her toward the bedroom. The Omega screamed, her feet stumbling on the floor, trying to resist, but the sweet scent emanating from her core only fed the Alpha's fury.

The room was immersed in Yelena's scent — Feminine, the strong smell of an Alpha marking her territory. Kate choked when she was thrown onto the bed, her head spinning from the sensory overdose. Her body betrayed her immediately, her legs spreading in a primal reflex, wetness dripping between her thighs.

Yelena didn't wait.

She fell upon Kate like a hungry animal, her teeth finding the Omega's neck while her hands tore away the remaining clothes that still covered them. The Alpha's penis rubbed against the brunette's thigh, prominent veins pulsing.

Kate screamed when Yelena penetrated her all at once, without preparation, without care. The pain was sharp and cutting, she was a virgin, and the Alpha's penis was too big — Defying the blonde's size. — Her nails scratched down Yelena's back, eyes wide, mouth open in a silent scream. Yelena growled, her pelvis slamming against the Omega's with force, each thrust pulling a new sound from Kate. But then — something changed.

The heat burning in Kate's insides began to transform, the pain mixing with something deeper. Her pussy contracted around Yelena's cock, her inner muscles adjusting, accepting the intrusion.

Yelena felt the change. Her movements became more fluid, deeper, the growl in her throat turning into a sound almost like satisfaction. Kate wasn't screaming anymore, now her moans were rough, broken, her hips moving to meet the other woman's with each thrust. Her cunny swallowed the Alpha, sucking deeper, squeezing, driving Yelena increasingly wild.

Yelena's first cumshot came like a hurricane. She buried herself to the hilt, her teeth sinking into Kate's shoulder while her member pulsed, dumping hot jets of semen into the Omega's womb. Kate sobbed, her body arching, her fingers digging into strong backs, not in pain, but in pure ecstasy. Yelena continued.

As soon as the last wave of pleasure passed, she was already moving again, her cock still hard inside Kate, still demanding more. This time, she turned the Omega onto her side, lifting one of the brunette's legs slightly in the air before sinking into her again. Kate moaned, half her face hidden in the pillow, limp and submissive. Heat now completely ruled her senses — there was no more fear, no more resistance. Only need.

Yelena used her as she wanted.

Each position a new assertion of dominance. Kate's belly swelled gradually, the Alpha's semen overflowing each time Yelena filled her anew.

Kate was oblivious, eyes unfocused, mouth slightly open, drooling. Her body trembled occasionally, inner muscles still contracting tightly around the blonde. Yelena licked a long stripe up the Omega's neck, savoring the taste of blood from her continuous bites.

Kate's body no longer responded properly after eight consecutive sessions.

Limp.

Now lying on her back again, legs splayed weakly to the sides. Mouth agape, saliva dripping down her chin, mixing with the never-ending tears. Glassy eyes fixed on some point on the ceiling.

Yelena didn't stop. Couldn't stop. Was unable to stop.

Her cock throbbed, covered in a grotesque mixture — her own cum dripping out, Kate's fluids, blood. She didn't clean it. Didn't need to. The wetness, the blood, only made it easier, the sound of flesh slapping against soaked flesh echoing through the room.

Kate didn't scream this time, just let out a hoarse gasp, fingers digging into her own thighs, nails leaving crescent marks on pale skin. Yelena snarled, teeth clamping on the Omega's shoulder as she buried herself in that heat, feeling the head of her cock hit the younger girl's cervix.

Her hips slammed against the brunette's with force, each thrust accompanied by a guttural, animalistic grunt. She had the blind need to fill that Omega until she overflowed. Kate whimpered, lips trembling, body shaking with each thrust.

"N-not f-fit-"

Yelena didn't let her finish. Growling louder, one hand on the Omega's throat, squeezing just enough to silence.

She decided when Kate spoke.

And now wasn't the time.

Her hips sped up, losing rhythm, becoming frantic, desperate. The heat built, pressure growing between the Omega's velvety walls. And then she felt it. The knot. The base of her cock suddenly swelled, expanding, locking inside the Omega with a wet sound. Kate cried when she felt that knot inflate inside her, stretching her already oversensitive walls, binding them together.

Yelena sighed, trembling, body curved over Kate. The load overflowed even with the knot — there was no more room. It spilled out the sides, mixing with existing fluids, creating a hot, sticky puddle beneath Kate.

In agony, Kate tried to crawl away.

Trembling fingers dug into the soaked sheets, nails tearing the fabric as her weak body twisted, trying to escape. Each movement was a stab of pain — Yelena's swollen knot inside her, trapped, hurting her more.

The Alpha was startled by her own reaction.

In years of experience, Yelena Belova had never knotted. Never felt this primitive need to lock, to claim, to possess. It was control she'd always maintained — until now.

"No-" Kate's voice scratched at her thoughts. Kate fought to pull away. But her body wouldn't obey.

Heat still burned inside her, fluids dripping down her thighs, mixing with the alpha's seed leaking around the knot, unable to contain everything Yelena had pumped into her. Yelena groaned, arms wrapping around Kate with brute strength, yanking her back against her sweaty body. The motion made the knot tug at the Omega's inner walls, and Yelena whimpered.

"Stop," she ordered, voice hoarse, teeth clenched.

But Kate didn't listen. Couldn't listen.

She tried again, her weak muscles contracting, struggling. Yelena howled when the knot was pulled once more, the tearing pain consuming her. The woman's hips moved instinctively, pushing the knot even deeper, making Kate scream as her already sensitive walls were stretched again. Yelena panted, drunk on the scent of her Omega mixed with her own.

"Full." Yelena snarled, one hand moving down to squeeze Kate's swollen belly. "My Omega full."

Kate sighed, her body finally giving way, surrendering to exhaustion and pain blending into something indistinguishable. Yelena licked a long stripe from her neck to her ear, savoring salt and fear. The knot still pulsed inside Kate, trapping her, ensuring every drop stayed where it belonged. Yelena exhaled, satisfied, sinking her fingers into the Kate's skin. They stayed like that for minutes until the knot finally relented.

The knot throbbed one last time, a hot, deep spasm, before finally releasing. Yelena felt the exact moment the tension snapped. A thick gush of white spilled into the Omega, so hot it made the poor girl shudder. Kate felt so full now. Her hips moved on their own, pushing slowly, feeling every contraction of Kate around her, her stilI-hard length dripping with Omega slick, mixing with their fluids, creating a wet, obscene noise with every motion.

"Mine" Yelena slurred, her hand sliding down to press against the lower curve of Kate's belly. The brunette didn't respond — just moaned.

The blonde didn't need words to know. She felt it. The Omega's body still clenched around her, still pulled, still begged for more, even as she overflowed. She pushed in again, deeper, groaning softly.

"Good Omega," she purred, starting to move in a slow rhythm. "Squeezing so damn good."

Kate whined, the Alpha's praise clearly affecting her, as even more wetness dripped. Yelena dragged the brunette even closer, feeling the omega's hot, tight warmth molding perfectly around her length.

"I'Il fll you again," Yelena promised. "Until there's no more room." She wouldn't stop until she was certain her omega was completely full.

Until there was no space left.

Yelena flipped Kate onto her stomach with a rough motion, her hands gripping the omega's hips and lifting her ass into the air. Kate's belly was visibly swollen, a soft, tense curve under sweaty skin.

Her aching length hovered for a second before Yelena aligned it again with Kate's soaked entrance.

Kate grunted when Yelena shoved into her in one thrust, the Omega lurching forward from the impact. She was so ready there was no resistance. The Alpha's length burned, Oversensitive from so many releases, but still demanding more. She needed to satisfy her Omega, who, even in protest, still begged to be filled.

Kate tried to crawl forward, a flicker of awareness returning, but Yelena of awareness returning, but Yelena yanked her back, burying herself nearly to the hilt.

The blonde hammered into the younger woman, each slam forcing more air from the Omega's lungs. The scent of heat and sex thickened the air.

Kate cried, her face buried in the mattress, her fists clenched in the sheets. Her body responded even against her will, weakly spasming around the Alpha's length. Yelena felt the pressure building again at the base of her spine. This time, there was no knot to lock them, just the raw, hot flood inside Kate. Again. She grunted from the effort, feeling the Omega's cunny milking her dry.

When she finally stopped, panting, her length slowly slipped out, coated in stickiness and cum. Strings of seed stickiness and cum. Strings of seed followed, leaving Kate's entrance gaping and twitching, a steady stream of fluid leaking out.

Yelena collapsed beside the omega, one possessive hand still gripping her hip. Kate didn't move.

Yelena huffed but pulled Kate against her sweaty body, her arms locking the Omega in an iron embrace. Kate weakly protested-a hoarse, broken whimper — but Yelena was already lining up behind her again, her half-hard length finding the omega's red, swollen entrance once more.

"Y-Yelena." Kate whimpered, her voice a thread of sound, but her body was already adjusting to the intrusion, her inner walls — still sensitive — molding to the Alpha's familiar shape.

Yelena didn't answer. She just sheathed herself to the hilt in one fluid motion, a whine escaping her throat as that wet heat enveloped her completely. There was no urgency now. Just the need to stay inside, to keep the connection, to feel her Omega pulsing around her.

Kate cried softly, her weak fingers clutching at Yelena's arm where it wrapped around her. Trapped fluids shifted inside her as Yelena gave shallow thrusts, just enough to stay buried.

The Alpha pressed her lips to the nape of Kate's neck, licking the salt from the bite marks she'd left. She moved inside the Omega not with desperation, but with deep satisfaction. She couldn't even remember how they'd ended up like this.

Kate finally relaxed, exhausted, dominated, and filled. Her tears dried against Yelena's skin. The Alpha sighed, content, feeling the Omega's final contractions around her, accepting her completely.

{...}

On the second day, Yelena fucked her again.

It was hot that afternoon, the atmosphere heavy with the smell of sex and sweat. Kate gasped under Yelena's body, her fingers buried in the Alpha's back, — which was now all scarred up, — as she was fucked against the mattress.

But something had changed.

The Omega's instinct, a blind, primitive desire.

Kate pushed against her hips with surprising force, her inner muscles clenching the alpha's cock like a fist, trying to milk the seed she so desperately needed.

“Ah, no, malen'kaya.” Yelena sighed, her eyes narrowing.

But Kate didn't hear. Or couldn't hear.

She rolled over, surprising the alpha, and mounted her with an awkward but determined movement. Yelena's cock went all the way in, and Kate moaned loudly, her head going back, her breasts bouncing.

For a moment, Yelena was paralyzed, admiring the brunette's neediness.

Kate began to ride her, moving up and down in a wild, desperate way, as if she was trying to force the Alpha's cum into her.

Yelena saw stars.

But then — the Alpha instinct woke up.

With a growl that echoed off the walls, Yelena suddenly sat up, grabbed Kate by the hair and pulled her head to one side, exposing her neck. Sharp teeth dug into the soft flesh, deep enough for blood to flow.

Kate screamed, leaning closer and closer to the blonde.

“You're not in charge here,” the Alpha murmured against her skin, her hips jerking upwards, regaining control. "Omega obeys."

And then she laid Kate down with a sudden movement, penetrating her hard again, punishing her audacity with brutal thrusts that made the bed slam against the wall. Kate cried out, contracting around the Alpha's cock, begging for more.

Yelena laughed, a husky, satisfied sound. And then he emptied himself inside her again, filling the rebellious Omega to overflowing.

{...}

On the third day, the room was plunged into darkness, lit only by the faint moonlight coming through the ajar window. The smell of Kate's heat permeated the air — sweet. Yelena woke up with an aching member, the Alpha instinct in her veins before her mind was even fully awake.

Kate was on all fours on the mattress, her ass sticking up in the air, her hips moving on their own in desperate little circles. Moisture trickled down her thighs, glistening in the dim light, and Yelena didn't think — she just acted.

The Alpha knelt behind her, hands gripping that narrow waist tightly, her fingers sinking into the soft flesh. Her cock was already hard, the red, swollen head slipping between Kate's thighs, looking for the right entrance, but in the darkness and the heat of the moment, Yelena missed.

The tip pressed against the Omega's tight asshole, and Kate moaned, a hoarse, confused sound.

“N-no, not there.” she stammered, her voice weak, her fingers clutching at the sheets.

But Yelena was already pushing.

The resistance was minimal — Kate was so wet, so open from the heat, that her body gave in more easily than it should have. The head of the Alpha's cock sank into her tight asshole, and Yelena let out a guttural growl.

“Yebat...” she took a deep breath, feeling that insane tightness around her.

Kate screamed, her muscles contracting involuntarily, trying to expel the intrusion, but Yelena didn't back down. On the contrary — she pulled Kate's hips back, going deeper, feeling every inch of that narrow channel opening up for her.

“It hurts.” Kate whimpered, but her inner muscles contracting in weak spasms, as if trying to pull the Alpha in further. Yelena didn't mind the protests. She was lost in the sensation, that hot, tight little hole, pulsing around her like a velvet glove. She began to move, short, brutal thrusts, each one deeper than the last.

Kate moaned, her mouth open, saliva dripping down her chin, her eyes unfocused. She tried to crawl forward, but Yelena pulled her back hard, irritated by the Omega's constant attempts to escape, her fingers leaving purple marks on her hips.

“Freeze.”

And then she sped up, her hips slamming against Kate's buttocks with a wet, obscene sound. The Omega's asshole was adapting, becoming softer, more malleable, but still absurdly tight — as if each thrust was the first. Yelena felt the heat rise, the pressure at the base of her spine, and then the orgasm came. The thick liquid flooding Kate's asshole in seconds.

The Omega screamed, gushing onto the bed, her body trembling, her muscles contracting in violent spasms, as if trying to suck every drop out. Yelena didn't stop moving — she kept pumping inside her, even after she had emptied herself, prolonging the orgasm for both of them, until Kate collapsed on the mattress, trembling.

Yelena fell on top of her, panting, her teeth finding the Omega's neck with another possessive bite. Kate didn't protest.

She was beyond that now.

Just a hot, used hole, full of cum, waiting for the next round.

And Yelena didn't intend to let her wait long.

{...}

On the fourth day, the heat was finally over.

The awakening was slow and painful.

Kate slowly opened her eyes, every muscle in her body protesting with weak moans. The midday light streamed in through the curtains, revealing the state of the room, sheets turned over, stained with dried fluids, the heavy smell of coitus still permeating the air.

She tried to sit up, but a sharp burning between her legs made her fall back onto the mattress. Her pussy was swollen, throbbing, red from so much use. Every little movement made her inner muscles throb, reminding her of how many times Yelena had filled her, how many times she had been forced to overflow.

Her trembling fingers found the mark on her neck — the Alpha's teeth had left a deep purple scar on her skin. Kate pressed lightly and felt a mixture of pain and something more complicated.

The bedroom door opened.

Yelena entered carrying a tray — sandwiches, fruits, juice, and a small blue porcelain teapot from which steam rose. Her eyes, previously black with pure instinct, now appeared greener, more human. But they still carried a possessive gleam.

"Eat." Yelena requested, placing the tray beside Kate on the bed.

Kate looked at the food, then at Yelena. Anger and betrayal burned in her throat, but her stomach growled loudly, betraying her. Three days of heat, three days without proper food, three days of being used — her body was at its limit.

She threw herself at the food like a starving beast, her hands trembling as she devoured everything she could reach. The bread, the meat, the fruits — all disappeared into her mouth with desperate urgency.

When Kate finally slowed down, the Alpha took the teapot and poured the tea into a small cup.

"Drink." she said, extending the cup to Kate.

The liquid had a horrible aroma that made Kate wrinkle her nose.

"What is this?" Asked, her voice still hoarse from screaming.

Yelena sat on the edge of the bed, her eyes fixed on Kate's.

"Prevents pregnancy." she explained, her voice surprisingly soft.

Kate looked at the liquid, her fingers trembling around the cup. With shaky hands, Kate brought the cup to her lips and drank. The tea was bitter, tasting like death, but she swallowed every last drop.

Yelena studied her for a few seconds before sighing "I warned you."

Kate raised her gaze.

"I thought you'd be different."

Yelena looked at her for a long moment before responding.

"I'm not."

The silence that followed was heavy. Kate lowered her eyes, handing the cup back to the Alpha. Yelena moved closer, sitting on the edge of the bed. Her hand — the same one that had restrained her — now moved with strange hesitation, almost as if holding back.

"But now you're marked," she said, her voice quieter. "My bite. My scent. Our souls are tied."

Kate looked at her, her eyes brimming with tears. Yelena didn't apologize. Alphas didn't apologize for taking what they wanted. But when her hand finally touched Kate's face, wiping away a tear she hadn't even noticed falling, the gesture was strangely gentle.

"Rest," Yelena ordered, but her voice lacked its former firmness. "When you wake up, I'll take you home."

Kate wanted to protest. Wanted to scream. Wanted to say she never wanted to see her again.

But her exhausted body wouldn't let her.

And when Yelena pulled the blanket over her, Kate fell asleep almost instantly, the alpha's scent still enveloping her like an invisible blanket.