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Chapter Text

The Doctor wasn't a chemist by all means. But he was good at virtually everything and there was a part of the lab dedicated to chemistry nonetheless, mostly used for when Robotnik occasionally felt the need to play with the molecular structure of another performance-enhancing drug to keep him awake for a few more days.

Sometimes Stone would spend his lunch breaks in this room, eating a sandwitch while he walked past the glass cabinets of carefully labeled powders and liquids. He spend his time there trying to understand the Doctor's seemingly random and often changing organizational system and tried to deduce what the to him unknown substances would do.

Most of the ones he did recognize by name were various amphetamines, though one beaker contained an astonishing amount of liquid LSD. Whatever kept the Doctor sane, he supposed.

When Stone entered the chemistry lab that day, he immediatly knew that Robotnik had been spending the prior evening there. The smell of fresh disinfectant hung in the air and there were a few glass utensils still drying in the wash basin. Stone unwrapped his sandwich and began absentmindly eating it as he let his eyes wander down the rows of chemicals, wondering how much of each it would take to kill a man.

Robotnik had seemed very laser-focused on the strings of code he had been producing this morning, barely acknowledging his assistant when a cup of coffee was placed next to him. If he'd been tinkering with the chemical compounds of some kind of stimulant last night it must have worked rather well.

His gaze was caught on something behind the glass door and he stopped mid-chew. One of the containers was seemingly unlabled. He stepped closer to see if it was simply turned around, but no, there was a new substance in the cabinet, without a label.
It was a small amount of light blue powder in a test tube. Nothing in the cabinet looked even remotely close to it, but what reason did Robotnik have to create his own drugs from scratch? The question piqued Stone's curiousity enough to momentarily forget every safety rule he'd ever learned and place the half eaten sandwich on the lab desk behind him.
He reached out and sure enough, the glass door was left unlocked.
Maybe the Doctor had planned to continue his work on it later today?

Stone was not usually a reckless man, he was able to assess any situation and handle it accordingly in seconds. But he had always been curious.
He reached out and picked up the strange powder. When he brought it close to his face to smell it a voice from his early memories, maybe his mother, scolded 'curiousity killed the cat.'
The substance was odorless. Stone tilted the test tube just enough for a small amount of the powder to fall onto his fingertip. Well.

'But satisfaction brought it back,' he thought to himself as he licked the substance from his finger. He was sure that the Doctor was too absorbed in his coding to notice if Stone ended up being a little high at his desk. And even if he did notice, after four years of working for Robotnik, Stone was sure this wouldn't cost him the job. Maybe he'd get punched, pushed around a little, insulted - but he never did mind any of those things too much.

The first symptoms set in while he was picking up his half eaten sandwich to throw it away. Stone practically felt his pupils dialate as heat began creeping out from under his collar. The clinical lights of the lab were suddenly too bright and hot and his suit was beginning to feel uncomfortable. He decided to ditch his suit jacket for the rest of his lunch break and let himself fall into the chair at the doctor's favoured desk when his knees suddenly seemed unable to hold his full weight anymore. He was slightly dizzy and the heat kept growing, coiling in his gut and sending blood down south.
With some confusion Stone realized that the heat he was feeling was arousal. Not an unusual side effect for some drugs, but it never affected him this strongly. And it seemed to be the only effect so far.

Curious, Stone rubbed a hand over the growing bulge in his pants and gasped. His senses were clearly heightened in some way, if just a simple touch sent sparks flying through his system like that.
He ground against his palm and groaned as his mind began to feel hazy from the oxytocin. He still had fifteen minutes of his break and there was no reason for Robotnik to check the cameras, right?
He unbuttoned his pants and slipped a hand into his boxers. He immediatly groaned at the touch. It felt as if he'd been pent up for years and, in a way, he had been. Thoughts of his boss filled his mind as Stone began to stroke himself slowly. Images of Robotnik choking him, pinning him against a wall, biting him.

He needed the Doctor in a way that he wouldn't be able to hide for much longer, that much was clear. If only he could show him, let out his pent up frustation somehow. His left hand gripped the chair he was sitting on as Stone imagined bending over his boss and showing him how he really felt about him.

Stone's orgasm wrecked through him at the mental image of Robotnik moaning his name. His vision went white as his body tensed up and waves of pleasure washed over him.

Every fiber of his being felt like it was vibrating in pure bliss as the orgasm slowly subsided.
When Stone opened his eyes again he was panting and his vision was slightly blurry. The only thing he could hear was the sound of rushing blood in his ears.

It took a second for the agent's brain to start working again, but when it did he finally came to the conclusion that the chemical must be an aphrodisiac.
Blushing, Stone considered why the Doctor would have made this. If it was goverment-assigned he would have known about it, but there was no reason for Robotnik to spend his free time on this.
Stone tried his best to clean up himself and his soiled underwear. He mantally chastised himself for not thinking ahead, now he wohld have to live with sticky boxers, gross.

His watch beeped. Break time's over.
The heat in his absdomen was already growing again, making him consider, just for a second, to be late.
But Robotnik would have his head and in this state Stone wouldn't be able to survive that.
So the agent tried his best to tuck his dick in his waistband in a way that wasn't too obvious, put his jacket back on and readjust his tie.

Stone got lucky. Like he predicted, Robotnik didn't move an inch from his position for the rest of the day, only pausing his flow state typing to take occasional sips of coffee.
If Stone had been master of his full cognitive fuctions, he would have taken note of the exact time that his symptoms started and stopped. But as it was he could only say that they lasted somewhere between one and three hours, after which he was overcome by light nausea and fatigue, making it hard to concentrate on anything at all.

By the time his shift ended the arousal had subsided completely and he was left with a bone deep exhaustion. He decided to catch up on the work he was behind on tomorrow after he'd had a restful sleep.

"Good night, Doctor."
Robotnik's only answer was a vague grunt and a wave of his hand. Sometimes he got like this and if Stone tried to interrupt his focus with concerns about frivolous things like sleep and sustinance, he only earned the Doctor's wrath.
So instead of telling Robotnik to remember to drink water or eat food, Stone simply looked at him for a few seconds.

Robotnik's hunched over form in the chair was sure to earn him backpain in the following morning. His head was cocked slightly to the right in concentration and his brows were furrowed. He was beautiful. It took an even larger amount of effort to finally tear his gaze away than usual.

After a few hours of sleep Stone finally felt like himself again. No lingering nausea or a hangover, the symptoms seemed to have completely subsided. What an interesting chemical he had found there.

Chapter Text

One could try to blame the agent's actions on an unnoticed lingering side effect of the aphrodisiac. But in reality, it was simply that the years of longing finally caused something in him to snap. The violent part of him that wanted to claim the Doctor finally won over.

He waited until the day after their latest project was sent off for production. The circumstances had to be ideal for this to even work and the high that the Doctor was on after a finished project would be very helpful for that. 

When he entered the room with his boss' drink in hand, he could already tell that Robotnik was in a good mood. Music was blaring and the vibrations of the bass were threatening to spill the hot coffee over Stone's hand as he stepped through the door. His boss was dancing through the room with big steps and flailing arm movements. His coat with the red lining was swirling with every sharp turn, almost reminescent of a flamenco dancer's dress. A hypnotising display, as always when the Doctor was dancing. 

After a few more subsequent twirls the music stopped and Robotnik stood in silence, slightly panting. Two more seconds and he spun around, pointing at Stone with a dramatically outstretched arm. 

"Coffee!" he yelled and Stone beamed at him in return. 

"Of course, Doctor. Your latte with steamed austrian goat's milk," Stone heard his own practiced professional voice say as he handed over the cup. 

Robotnik mumbled "i'm parched," before taking two big gulps. He smacked his lips loudly. "Back to work!"

'No discernable taste or change of texture. Interesting,' Stone noted and took his place at the desk on the wall oposite of the Doctor. While Robotnik returned to his previous work of sketching something on a big sheet of paper, Stone watched him over his shoulder. From time to time the Doctor's left hand would reach out towards the coffee while his right continued scribbling. Stone always admired his ability to sustain such complete focus while multitasking. 

After only a few minutes however, the Doctor suddenly stopped. His posture straightened and a few holographic screens appeared infront of him. They displayed Robotnik's vitals, his pulse and body temperature being notably elevated. 

"Stone?" He called. 

"Yes, Doctor?" Stone replied as he got up from his chair and walked over. 

"I'm feeling sick. If i pass out in the next five minutes call an ambulance. But don't allow them to do more than the most necessary tests on me, understood?"

Stone stepped closely behind Robotnik's chair. "Understood, Sir. Anything else I can do for you?"

But before Robotnik could reply with a quip about how Stone had nothing to possibly offer, the assistant boldly placed both hands on the Doctor's shoulders and squeezed lightly. 

"What are you!?- oh." 

"You're so tensed up, Sir. Let me help you with that," Stone said soothingly and watched with a smug smile as the screen displayed his boss' pulse spiking. 

"Yes, maybe that would be...appreciated," Robotnik admitted as he relaxed his shoulders. 

Stone worked the Doctor's muscles slowly, careful to not cause too much discomfort. Based on the small sounds that escaped him with each breath it seemed to be working. Stone grabbed the office chair and spun Robotnik around so that he was facing him now. He wordlessly climbed into the chair, straddling his Doctor's lab as he once again began to massage his shoulders and neck. Robotnik's pupils were dialated enough to practically swallow up the brown iris and they were fixed on Stone's face with that intense stare that gave Stone goosebumps every time. His pale skin was flushed a healthy shade of pink and Stone couldn't help thinking that he looked incomprehensibly beautiful like this. 

"Close your eyes and relax, Sir," Stone commanded, making sure his voice was gentle. 

"Don't tell me what to do," his boss mumbled, but obeyed nonetheless. Stone got up from the chair again, massaging the Doctor's biceps as he went. He only broke the contact for a second, but Robotnik's face immediatly scrunched up as if he was about to complain. He was shut up however, by his assistant placing both his hands on his thighs as he went down to kneel between his legs. Stone gently pryed his boss' knees apart and earned a chuckle from above. He looked up to see that Robotnik was watching him with dark half-lidded eyes. 

"What exactly do you think you're doing, Agent?" 

His voice sounded amused rather than uncomfortable and Stone gained another confidence boost. 

"Just let me help you relax, Doctor," Stone replied, reaching for the Doctor's zipper. From above came a sharp inhale and he stopped in the movement. 

"Well get on with it, Stone. I have work to get back to." That was as clear of an invitation as he could expect and Stone quickly opened Robotnik's pants. 

As expected from Stone's own little trial run with the aphrodisiac, the Doctor's dick was already hard and leaking precum and Stone strangely felt himself blush as he freed it from it's confinements. He had been wanting and imagining this situation for so long, actually seeing his boss' dick in front of him made his mouth water.

Robotnik ripped Stone out of his admiration by grabbing his hair. "I said get on with it," he commanded with gritted teeth and Stone dutifully obeyed. He let himself be pushed down onto Robotnik's cock without resisting until he felt his gag reflex being triggered and stopped to take a breath through his nose. When he began to slowly move his head up and down, he savoured the slight salty taste of fresh sweat, no doubt caused by the increased body heat. The Doctor's sigh of relief turned into a breathy moan as Stone sucked, hollowing out his cheeks. 

He allowed himself to be guided by Ivo's hand, which was gently urging him to increase his tempo steadily as he bobbed his head up and down. 

"Fuck, how are you doing that?" Robotnik huffed and the words went straight to Stone's dick, despite knowing that the aphrodisiac was responsible for most of the pleasure.

"You better not fucking pull away," the Doctor grumbled as he began moving his hips, fucking into his assistant's mouth. Stone's eyes rolled back and he did his best to let his jaw go slack, allowing for easier access. The movement became jerky quick and Robotnik's hand pushed him down harder before he stopped, buried to the hilt in Stone's mouth. A deep groan escaped him and Stone felt his dick spasming and coating his tounge with semen. He did his best to swallow as his boss came, but when Robotnik pulled away, a small dribble of cum collected on the floor. 

Stone looked up, panting. Robotnik's eyes were closed and his face was flushed. Stone wanted to devour him. 

He gently tucked Robotnik's dick back into his red boxers and climbed back upon the chair. His boss was too busy recovering from orgasm to protest, so Stone used the opportunity to gently cup his face, admiring it from up close. He began placing kisses on Robotnik's cheek, then on his jawline. When he began nibbling on the skin behind his ear, the Doctor's hands shot up and grabbed him by the hips, not pushing him away, just...holding him. Stone moved on to kiss along Robotnik's pale neck, sucking at a particularly sensitive spot. Robotnik's hips buckled up against him and Stone could tell that he was already hard again. 

"Seems like you need to relax a bit more ," Stone whispered and recieved a sharp squeeze of his waist. 

"If you don't shut up and do something about it, I will blow up this entire lab with both of us in it," Robotnik threatened. Stone smiled into the crook of his neck. 

He got up suddenly, pulling Robotnik by the lapels up with him. Standing so close, a shared hot breath between them, Stone couldn't help himself. 

He pressed their lips together, rough and needy. Their kiss was uncoordinated and wild, but neither of them cared. Stone pushed Robotnik up against the work desk, clumsily shoving the coat from the doctor's shoulders. The heavy fabric revealed a black sleeveless turtleneck that showed Robotnik's freckled shoulders. 

"Fuck," was all that Stone could say at the sight when they broke apart. 

Robotnik leaned in again, but Stone pushed him away. 

"Take of your pants."

Again Robotnik complained about being ordered around, but when Stone was done retrieving the lube from his own desk, he stood there leaning against the table, naked from the waist down. Stone grinned. 

"Good boy," he praised and Robotnik's face became beet red. 

"As you superior I forbid you from ever calling me that again, you absolute imbicel!"

Stone simply waved it off and kissed him again. This time Robotnik shoved him away. 

"Who do you think you are, talking to me like that? I could incinerate you in seconds, i could-"

Stone grabbed him by the hips. 

"Shut up." 

It was easy for Stone to turn the Doctor around. The older man was surprisingly strong, but he was lean and his body weight was nothing for Stone, who spend much of his freetime working out. 

Evidently, Robotnik liked being manhandled by Stone. He made a small surprised sound and went quiet as Stone's hands exlored under his shirt. The skin there was soft and he could feel a few scars that he badly wanted to ask about. 

Eventually Stone covered his fingers in lube and began prepping Robotnik with one hand, undoing his own pants with the other. What Robotnik lacked in experience he made up for with eagerness. The Doctor fucked himself back onto Stone's fingers like he had something to prove to the younger man.

"Stone, if you don't fuck me right now, you're fired. I mean it!" Robotnik yelled from where he had buried his face in his elbow on the desk. Stone felt a sense of posessiveness well up in him. No matter what the future held, today the Doctor was all his. 

Stone roughly grabbed Robotnik by the hips. 

"Ready?" 

"I'll kill you, you ungratefull bas-" 

The rest of the insult was cut off as his assistant pushed into him without warning. 

"Gnh- bast-uarg-bastard!" Robotnik pressed out as Stone began setting a ruthless pace right away. 

"Fuck, Stone, that's what I'm- hah! Talking about!" his boss praised between thrusts and Stone grabbed his hips harder. The Doctor was always talkative and he wouldn't have it any other way. 

"Stone, please!" 

The plea made the agent's rythm falter for a second. Getting the Doctor to beg was something he hadn't even considered possible. 

"Ghh- touch me already!" 

"Of course, Doctor," Stone replied in his most professional tone. 

He adjusted his angle so that he could reach around comfortably before continuing to move. One hand now on his boss' still slightly spit-slick cock, the other on the desk for stability, he began thrusting again. 

"Holy fuck!" the man beneath him exclaimed, "just like that, Stone!"

Hearing Robotnik whimper and moan beneath him like this gave Stone a strength he didn't think possible. He hammered into his boss with all his might while moving his hand in a slightly slower rythm. 

Robotnik groaned loudly and Stone felt his boss' entire body shudder beneath him. His muscles contracted around his dick and Stone bit his lower lip in the effort that it took to not join in with his own orgasm. He had different plans.

While Robotnik shuddered and whimpered, Stone slowly pulled out and took a minute to catch his breath. 

Robotnik pushed himself up and turned to him on wobbly legs. His hair was a mess, his face red and his pupils still dark and threatening to pull Stone in. But before he could say anything, the agent maneuvered him to lie with his back on the table. Robotnik sighed and closed his eyes. It was evident that he was exhausted already, his skin glistening and the sleeveless turtleneck damp. Stone ran a hand along the older man's stomach, admiring the way his breath hitched. 

Stone's cock was aching. Seeing Robotnik like this seemed to set loose a primal part of him that he could barely control. 

He hooked his arms under both of Robotnik's legs and hoisted them over his elbows. Robotnik's eyes shot open again. 

"Stone, what are you-?" 

Stone pushed back into him. 

"I'm sorry, Sir. I just can't- can't hold back. You're so beautiful."

Robotnik grinned up at him. There was a bit of drool on his bottom lip. 

Stone took his time. Admiring how Robotnik's body moved with his every thrust. How his hands were clasping at the edge of the table for support. How his spent cock quickly became hard again, thanks to the aphrodisiac. 

"Look at you, Doctor," Stone heard himself say almost without thinking. "Who would have thought you would enjoy it so much to give up control?"

No response, Robotnik's rythmic groaning was the only sound from his boss. 

"Fuck, you know-" Stone picked up his pace, "you could have had this much sooner, if you had just given me a fucking signal!" Stone reached out to Robotnik's face, giving him a light slap to make sure he was listening. "But no, Doctor Robotnik is above things like emotions and urges. The aphrodisiac he created in his lab is of purely scientific interest, of course." 

Stone grinned down manically at Robotnik, who seemed to barely comprehend that he was being spoken to. "Sometimes i wonder if you're even aware that you're just as painfully human as the rest of us." 

Stone incresed his speed even further and began to stroke Robotnik's cock again. This finally got a reaction, as his boss writhed beneath him, incomprehensibly pleading and begging.

"Lucky for you, I know what you are, Sir. I know what you need. You should thank me." 

Stone could feel his own orgasm building as he feverously jerked Robotnik off. 

Between muffled moans and whimpers he could make out a clear "thank you" and that finally pushed him over the edge.

"Fuck. You're. Welcome." he groaned as the orgasm rolled through him and he buried his dick inside Robotnik as far as he could. His boss shook and let out a pathetic sob. Stone watched in delight as the Doctor came in his hand and over his own stomach and turtleneck. 

Stone slumped over, bracing his forearms against the table. For a few minutes there was just their labored breathing and occasional quiet sobs from Robotnik. When those faded and Stone regained his strength, he saw that the Doctor had passed out.

He carefully let go of his legs and pulled out. Stone considered leaving him like this, covered in his own cum and Stone's dripping out of him onto the floor. 

But he loved the man, even if it was in a twisted sort of way. So instead, Stone helped the exhausted Robotnik out of his soiled turtleneck and cleaned him the best he could with a wet rag. Luckily there was a room in the lab that held a bed. 

He carried his boss there bridal style, admiring his naked form as he went. The Doctor looked so fragile like this, no wonder he always felt the need to protect himself with multiple layers of clothing. Before leaving, Stone placed a large glass of water on the bedside table and kissed Robotnik gently on the forehead. It was probably the last chance he'd get. 

Chapter Text

The fact that no one appeared at his front door to arrest or kill him that night made Stone anxious. He didn't even get a text message from the Doctor, nothing of the consequences Stone had been dreading. 

So, since he didn't know what else to do, the next day Stone returned to the lab. 

He half expected to be shot as soon as he stepped through the door, but the Badniks greeted him with their usual beeping. Stone found the Doctor at his desk, buried in his work as always. 

"Doctor?"

Robotnik turned around, he seemed to be in perfect shape, not a hair out of place, except for the dark circles under his eyes. 

"Stone. Where is my coffee? Or has your brain finally stopped being able to comprehend the most menial of orders? Let me remind you. Latte with steamed austrian goat's milk every day at 7am. Think you can handle that?" 

Stone was left speechless. So instead of a verbal reply he just nodded and turned, leaving to the small kitchen with his mind racing. 

There was no way the doctor didn't remember what happened yesterday. But maybe he didn't remember that it was him? He did pass out from exhaustion. Maybe he was just waiting for Stone to bring it up? Should he try apologizing?

No, he couldn't risk that. If there was a chance that Robotnik didn't remember that it was Stone, he had to be careful. He loved this job.

Robotnik didn't bring it up the whole day, nor the one after that. After two weeks of normalcy, Stone finally began to relax. If the Doctor was going to punish him, he surely would have done so already. 

So Stone let his guard down. Allowed his life alongside the Doctor to return to the comfortable routine from before. He didn't mind keeping a little dirty secret. 

******

Stone woke up blindfolded and tied to what felt like a chair, stripped down to his underwear with his legs and arms bound tightly. He had no recollection of how he got there or who could have abducted him. 

Only seconds after he woke up the sound of footsteps echoed through the room. Stone struggled against the ropes, but they were thick and well bound. His mind raced, trying to figure out who would have reason to kidnap him. Too many people did. But if they wanted him to spill information on the Doctor they were out of luck. 

The footsteps stopped shortly infront of him and Stone held his breath, trying to listen for anything that would give away who was standing infront of him. 

There was the whirr of air and then a sharp pain on his jaw. Someone had hit him, cutting his cheek on his teeth. Stone spit out blood, aiming for his assailant. The chuckle that followed was eerily familiar. 

"Doctor?" he hesitantly asked. 

A familiarly textured gloved hand grabbed his jaw. "You got blood on my coat," the Doctor stated cooly, clearly displeased. Despite the circumstances Stone found himself apologizing. 

"I'm sorry, I didn't- what is going on?"

Silence. Then another punch and the ringing of his ears. This time Stone allowed the blood from his split bottom lip to drip down his chin instead. 

"Do you know why I allowed you to stay by my side for four years, agent?" Robotnik asked, circling around the chair. "You were loyal and obedient. Never snapped no matter how much I pushed you. The perfect pet." The steps stopped behind Stone and he tensed, anticipating another punch. "Or so I thought." 

Robotnik's voice dripped with disdain. The cold metal of what Stone immediatly recognized as a knife grazed his neck and he sucked in a sharp breath. "Sir?"

Robotnik was infront of him again and Stone wished he could see the Doctor's expression to be able to assess the situation better. 

"You turned out quite capable of betrayal." The tip of the knife was pressed into the sensitive skin over his collarbone and Robotnik laughed softly at the way he surpressed a yelp.

"Using my own inventions against me like that." The knife trailed down his pectoral muscle. "You pervert."

Robotnik pointedly pressed the knife's tip into Stone's nipple and a strained groan escaped his throat. He knew that his chances of persuading his captor were slim, Robotnik didn't show mercy. But he tried anyway. 

"I'm sorry, Doctor, please-" 

"Shush!" The knife drew blood and Stone bit his lip to supress a grunt of pain. 

"What were you thinking, agent? Or was your mind too clouded by your baser instincts to even form a coherrent thought at all?"

The knife trailed back up, under his chin, lifting his head as if Robotnik was trying to inspect his brain for any thoughts. 

"The substance wasn't even finished yet. The side effects lasted for days, you moron!"

Stone swallowed hard and felt the press of the metal in the soft skin under his jaw. Robotnik sighed and the knife disappeared from Stone's throat. "Whatever shall I do with you, agent?"

Stone could feel his pulse racing from a mix of fear and something else. 

"It will never happen again, Sir. Please let me prove my loyalty again," he said in the steadiest voice he could muster. Robotnik leaned in close enough that Stone could feel his breath on his face, before he loudly imitated an incorrect buzzer. 

"BZZZ! Try again." 

"You...don't have to kill me. If you let me go i'll resign and you don't have to ever see me again?"

Another loud incorrect buzzer sound close to his face. 

"You could...punish me. Sir."

Stone hoped that the way he said that didn't sound too suggestive. 

"Now here's an idea! You get a bronze star for getting it on your third try!" 

The blindfold was ripped from his face and Stone blinked a couple of times to adjust to the light. They were in the chem lab and bright overhead lights framed the Doctor's form from behind as he loomed over Stone. 

Robotnik cocked his head to the side with a devilish grin. "I think I even have some ideas for that already."

The Doctor untied his ankles from the chair first. Then he circled behind him and leaned close to his ear. "If you try to fight or run I will have a badnik kill you. Understood?"

A shiver ran down Stone's spine. 

"Understood, Sir."

"First things first!" The doctor exclaimed and before Stone could ask what he meant, he felt a prick on his upper arm. Then slight pressure, like getting a vaccine. Only then his arms hands were untied as well and he caught a glimse of an empty syringe that Robotnik was disposing off.

For a second he considered running, but he knew that his boss was serious about the threat. So he allowed his hands to be tied together behind his back without protest. He knew he was at the Doctor's mercy one way or another. 

Robotnik grabbed him roughly by the back of his neck, the metal parts of his glove digging into Stone's skin. He pushed him against a table, forcing the agent to akwardly fold over the edge. 

"You better not move an inch," the Doctor growled. 

Bent over the desk, his chest pressed to the cold surface and his hands bound behind his back, Stone realized what he'd been injected. 

The symptoms were different this time around. Instead of nausea, his abdomen was only filled with pleasant heat, that made it's way to his dick almost instantly. He was still feeling warm, but not as uncomfortably hot as last time. Every sensation became stronger. He could feel exactly where his skin touched the cold surface, where the Doctor's knife had left small, weeping cuts and especially how his now painfully hard cock ached against the fabric of his underwear. 

Stone craned his neck, but Robotnik was rummaging with something out of sight. 

"Do you recognize this position?" 

The hiss of a bunsen burner sent a tingle of fear down Stone's spine. 

"Probably not," Robotnik leaned over him, pressing up to Stone from behind and bracing himself with his arms to the left and right of his assistant, "you weren't the one pressed to the table last time." 

Robotnik's voice was full of disdain and anger, but Stone could only focus on how close they were, how the Doctor's mustache tickled his ear as he spoke.

His hips involuntarily twitched backwards against Robotnik and as if to punish him for it, the Doctor stepped away.

"I think i have come up with a quite fitting punishment for your disloyalty. Just a little reminder that you are mine. Not the other way around." 

Stone still couldn't see what was happening, but he wasn't sure if he'd have cared anyways. Whatever it was, he just hoped that the Doctor would touch him for it. 

His hopes were answered when Robotnik stepped back behind him and placed a gloved hand on Stone's tied up wrists, holding them in place against his back. 

"Try not to move. It will only hurt more if you do."

A small whimper escaped Stone at the sudden touch. His head was swimming with an overload of sensations and the craving for more. "Don't worry, agent. Tramp stamps are coming back in style," Robotnik laughed.

Stone didn't have time to be confused about that statement. His lower back errupted in burning hot pain and his head snapped back in a cry of pain. His fight or flight responses kicked him, trying to force him to struggle free, but Robotnik had him firmly pinned between his lower body and the hand on his back.

Robotnik said nothing while Stone's cry faded into a strained whimper as he felt his skin burn and blister. Eventually the heat stopped and Stone heard Robotnik put down something metallic behind him. The pain in his lower back spread out over his skin like venom through his veins. When Robotnik grabbed his hips, he yelped. 

"Very obedient, agent. It turned out just how I wanted." 

It was almost praise and that was enough for Stone to arch his back slightly, pressing up against Robotnik behind him. 

When the Doctor grabbed the elastics of Stone's boxers another wave of heat spilled through his body and he couldn't supress the whimper that left his lips. The burnt spot on his back pulsed in time with his heartbeat. 

"Eager," Robotnik simply commented as he pulled down his assistant's underwear and left him utterly naked. 

If he hadn't been painfully turned out by all of this, Stone might have been embarassed and humiliated. But right now he simply spread his legs and craned his neck to look at the doctor behind him. Just in time to watch him pull off both his control gloves. 

The sight of Robotnik's bare hands was enough to cause Stone to buck his hips forward, painfully grinding his erection against the edge of the desk. 

"Please," he pleaded breathlessly. Robotnik laughed as he pushed his head back down flat against the table. 

"I'm not going to go easy on you, Stone. This is a punishment after all." 

Stone yelped at the sensation as a finger covered in cool lube pushed inside of him without warning. Robotnik didn't give him much time to adjust, pushing his finger in up to the second knuckle and moving it almost immediatly. When he added more lube and a second finger, Stone groaned with a clenched jaw. 

The painful stretch was mixing with the pain from his burned lower back and his aching cock, forming a deliciously confusing cocktail of sensations. 

He could hear Robotnik mumble to himself and occasionally chuckle, but couldn't make anything out over his own strained breaths and fuzzy mind. The only thing he could make out clearly was the words "but you probably like the pain anyways, you freak," as Robotnik was pulling out his slick fingers. 

Stone wouldn't have disagreed under normal circumstances and he certainly wasn't going to now. 

The Doctor wiped his fingers on Stone's skin. It only made sense, Robotnik shouldn't have to dirty himself with these things. With another generous amount of unwarmed lube Robotnik finally pushed his tip inside. Stone shuddered and braced himself, tensing up in anticipation. But instead of pushing further in, Robotnik stilled. When Stone tried to push back, he followed the movement backwards. 

"Ah-ah-ah. Beg."

Stone grit his teeth. It wasn't that he had any sense of pride left that was being destroyed, he was simply frustrated and impatient.

"Please, Doctor. Please just fuck me already, I can't take it any longer. Sir, I need you," he begged shamelessly while continuing to try to wriggle out of Robotnik's hold. The Robotocist was deceptively strong and in this position Stone found he was extra powerless. 

Robotnik gave an affirming hum. And finally pushed inside. 

Of course he had been right, Stone enjoyed the pain of it just as much as he did the pleasure. The Doctor was never wrong, after all. His vision began to swim as Robotnik traced the burn on his back with a finger while continuing to slowly push into his assistant. When the Doctor grazed his prostate, Stone bit his lip so hard he started to taste blood again. 

Robotnik leaned his whole weight onto Stone's bound wrist and began fucking him slowly against the table, the effect of the aphrodisiac already having Stone see fireworks go off behind his eyelids. 

The Doctor seemed to heavily enjoy the whimpers that he coaxed out of Stone so easily. He shifted his weight on one arm again to lean foward and finally grab Stone's neglected cock. Pain shot out from his lower back as the Doctor put pressure on the fresh burn and he helplessly twitched and writhed under Robotnik, who slowly stroked him with a steady, ungloved hand. 

The skin to skin contact was enough to push Stone over the edge almost instantly. With a shout he came, shuddering as the Doctor stroked him through it. Stone saw stars. Robotnik must have substantially improved the formula, effortlessly providing Stone with what felt like the best orgasm of his life. 

"I didn't know you were capable of such whorish sounds, Agent," Robotnik commented smugly as he again wiped his hand on Stone, who could only let out a pathetic whimper. But the Doctor seemed to only be getting started. 

He roughly grabbed Stone's hips and increased his speed until each thrust was accompanied by the sound of skin slapping against skin and air being pressed out of Stone's lungs in gasps and moans. It was overstimulating in the best way. The Doctor's fingertips dug deeper into Stone's sides, pulling him back with every thrust. 

Something about the angle changed slightly and Stone suddenly realized he was already hard again. "Doctor, please-ah!" 

Sparks flooded his lower half as Robotnik grazed against his prostate, again and again, with each snap of his hips. 

"Use your words, big boy," the Doctor teased, somehow barely even sounding out of breath. 

"Touch- me- again-" Stone pleaded between thrusts, trying to crane his neck around to look at Robotnik, to no avail. 

"Haven't I done you enough favors? No," Stone could hear the grin spreading across his Doctor's beautiful face as he spoke, "you're going to cum just like this. And you're going to time it just right."

The thought of reaching climax together with Robotnik sent a new wave arousal right to his twitching dick and he attempted to nod. 

Robotnik picked up the pace again, ruthelessly pounding into Stone and grabbing him strong enough to surely leave fingertip-shaped bruises. "Yeah, you're finally gonna be good for me, right? Accept that I have full control over you."

Stone could only whimper. The Doctor's voice was low and gravelly and the implications of his words sent shivers down his spine. 

"Fuck, Stone. Come for me."

Stone couldn't have said what did it. The command, or the feeling of Robotnik's cock twitching inside of him, painting his insides with his cum. But he convulsed as the heat that had been building inside of him again came to a cruscendo and he came for the second time, moaning the Doctor's title over and over again. 

Robotnik stilled and for a minute there was only the sound of their labored breathing, each trying to regain a sense of reality. Then Robotnik pulled out, stepped away and let himself fall into a chair. The sudden loss of contact sent a strong pang of need through Stone and he shuffled off the table to look at the Doctor. 

Unfortunatly he had underestimated how weak his legs were and as soon as he turned around and put his weight on them, he collapsed to his knees. Robotnik chuckled, looking down at him from the swivel chair, head propped up on his hand. 

Stone didn't mind. 

He shuffled over on his knees and carefully placed his chin on the Doctor's leg. Normally he wouldn't dare initiate touch like this, but he couldn't stand being seperated from Robotnik right now. 

The doctor was beautiful as ever. His boxers were already pulled back up, but his pants were sitting low and open, his hair had fallen out of place and his hands were bare. 

"Good boy," Robotnik praised, reaching out and patting Stone's head. The gesture felt strangely intimate, more so than anything they had done. 

Stone closed his eyes and leaned into the touch. His back was still painfully burned and his dick was beginning to come back to life thanks to the aphrodisiac, but he managed to ignore it in favor of head pats. At least until Robotnik shoved a foot between Stone's legs, applying light pressure. Stone yelped and shot upwards onto his knees, but inadvertently ended up grinding against the Doctor's shin slighly, causing him to whimper. Robotnik laughed cruelly. 

"Still haven't had enough? I should castrate you, maybe then you'd be more obedient."

Stone knew an empty threat when he heard one and this one was particularly obvious in the way that Robotnik was moving his leg against Stone, providing more friction. 

The fabric of the pantleg didn't exactly feel comfortable against his sensitive skin, but the need for friction overrode any and all pain responses in Stone's body. 

"Go on then, mutt. Take what you need," Robotnik ordered with a smirk. 

Immediatly Stone began moving his hips, rutting against the Doctor's leg with short, frantic movements. He bit his lip in concentration and felt the wound there reopen. Stone's dick was beginning to feel sore, but he had a feeling he would rut himself bloody if he had to, the aphrodisiac wouldn't let him stop. 

When Robotnik reached out to touch his face, Stone's wide eyes followed the movement. The Doctor swiftly wiped his assistant's bottom lip with his thumb, gathering bright red blood on the fingertip. 

He pulled back and put the thumb to his own mouth. While keeping intense eyecontact with Stone, he licked his finger clean. 

Stone couldn't take it anymore. Pain and pleasure were one to him and Robotnik provided both. He began humping his Doctor's leg faster, doing his best to keep up the eyecontact. Robotnik placed his hand back on Stone's head, gently stroking it, providing a delicious wholesome contrast to Stone's animalistic rutting. Tears began to well up in his eyes. 

When Stone came for the third time, tears fell down his face and without knowing why, he sobbed. He buried his face in the Doctor's thigh as the orgasm wrecked through his body violently, trying to focus on the calming hand in his hair instead. 

"Learned your lesson, Stone?" the Doctor asked after a few minutes of silence between them. Stone nodded, looking up at him with big watery eyes. 

"Yes, Doctor. Thank you," he replied, his voice sounding strained and hoarse . 

The gentle moment was over. Robotnik pushed himself away from Stone on his swivel chair and put on his belt. His gaze fell on his shin. 

"Tz. You stained my pants." He got up and stood over Stone. "I was going to untie your arms, but it looks like you'll have to figure that out yourself now, you slob."

Before Stone could say anything, Robotnik grabbed a fistfull of his hair and shoved him into the floor. Without his arms to brace the impact, Stone hit the tiles face first, once again reopening his split lip. He watched as a few drops of his blood gathered on the tile floor, mixing with the small puddle of cum there.

"Gross," was the last thing Robotnik said before he left him there. 

That evening Stone stood infront of his mirror, looking at himself over the shoulder. There, right above his tailbone was a fresh burn in the shape of Robotnik's logo. He was the Doctor's property now, branded for life. Stone marveled at Robotnik's ingenuity when his smartwatch pinged. 

The Doctor's message simply read "Make sure to use Aloe Vera lotion and bandage the burn loosely." 

"I love you too, Doctor," Stone whispered with a smile.