The Experiment
by EveryDenialShorts
Copyright© 2026 by EveryDenialShorts
Erotica Sex Story: After being kidnapped, Lena is forced to undergo relentless daily sessions in a hidden research facility. Strapped helplessly to a powerful fucking machine, she endures endless mechanical orgasms while a cheerful assistant and cold doctor monitor her every response. As experimental pleasure drugs heighten her sensitivity and push her body to its limits, Lena finds herself trapped between exhaustion and unwilling ecstasy. How long can she resist before the pleasure consumes her completely?
Caution: This Erotica Sex Story contains strong sexual content, including Fa Drunk/Drugged NonConsensual Reluctant Fiction Lactation Sex Toys Doctor/Nurse Small Breasts .
The lights turned on overhead with their usual steady glow. She opened her eyes slowly and remained still beneath the thin blanket. A deep sigh escaped her lips. It carried the quiet acceptance that came from too many mornings exactly like this one. She did not need to look at the walls or the door to know where she was. The room had become as familiar as her own skin.
She pushed the blanket aside and sat up on the bed. The mattress was decent, firm enough to support her without sagging too much, but it held no special comfort. No extra pillows or soft headboard, just the basic frame and sheets that had been washed countless times. Her bare feet touched the smooth floor. The cool air touched her skin immediately, raising small bumps across her arms and legs. She had grown accustomed to the steady temperature long ago, but the shiver still came each morning, a brief reaction her body could not quite suppress.
She ran a hand through her hair, pushing the dark strands back from her face. Her name was Lena. Eighteen years old. At least that was what she still told herself. Time had started to blur in this place. She stood up and stretched her arms above her head, her small breasts lifting slightly with the motion, the pink tips tightening in the cool air. She ignored the sensation. Her body had become a tool, a means to an end. Nothing more.
The room was small and plain. Four walls, one door, one bed, and a small toilet area behind a low partition. No windows. No decorations. Just the vent near the ceiling that pushed in the same cool air day after day. She had explored every inch of it so many times that she could walk through it with her eyes closed. The walls were smooth and cool to the touch. The floor never changed temperature. Everything was designed to be simple and unbreakable.
A soft scrape sounded from the bottom of the door. The slot opened and a tray slid inside. It stopped a few feet into the room. Lena walked over and crouched down to pick it up. The tray held the usual meal. A small portion of oatmeal, a piece of fruit, a slice of bread, and a cup of water. Nothing fancy. Nothing different. She carried it back to the bed and sat down with it on her lap.
She ate slowly. She had learned to make the food last and to notice every flavor, even if it was mild. The oatmeal was warm today, which was a small change from the usual lukewarm. She took a sip of water and let it sit in her mouth for a moment before swallowing. The apple was crisp and slightly sour. The bread was soft but without much taste. It was fuel, nothing more.
Her mind wandered as she ate. She thought about the life she used to have. Mornings with coffee from her favorite shop. The sound of traffic outside her old apartment. Friends laughing at silly jokes. Those memories felt distant now, like scenes from a movie she once watched. She did not dwell on them too long. Dwelling made the days harder.
She finished the meal and slid it back under the door. The tray was gone in a moment, pulled back into the silence on the other side, the slot closing with a quiet click.
Lena stood and walked over to the small sink. She turned on the tap and washed her face with cool water, then brushed her teeth with the provided toothbrush and paste. She looked up, pretending there was a mirror there. She knew what she looked like. Pale skin, dark eyes, black hair that fell to her shoulders. Her body was slim now, thinner than it had ever been. The small portions and limited food had taken their toll. Her ribs showed faintly beneath her skin when she breathed deeply. Her hips had narrowed. Her stomach was flat and concave in a way it had not been before. She had definitely lost weight.
Yet even with the loss, her body still held its femininity. Her waist curved gently into hips that still held a soft, womanly shape. Her small breasts remained pert, their natural roundness unchanged by the hardship. Her legs, though leaner, kept the long lines that had once drawn glances back home. There was a sexuality in the way her body moved, in the subtle sway of her hips when she walked. It was a trait she could not erase, no matter how much she tried to ignore it.
She was thin, but not broken. The feminine softness had not left her completely.
She ran her hands down her sides, feeling the changes. It was a habit now. A way to check that she was still herself. Her skin was smooth and cool to her own touch. Goose bumps rose again under her fingers. She let her hands drop.
Then she did what she always did next. She started to exercise.
The exercise was her routine, the one thing she could control. She had no weights, no equipment, but she had herself and the floor. She began with stretches. She bent forward and touched her toes, feeling the pull in her hamstrings. Then she sat on the floor and spread her legs, reaching for each foot in turn, her fingers brushing the tips. The muscles in her back and legs loosened gradually.
Then she switched to squats. She placed her hands behind her head and lowered herself down, keeping her back straight. Up and down, slow and steady. Her thighs began to burn after the first twenty. She did fifty before moving on. Push-ups came next. She kept her body in a straight line and lowered herself until her chest almost touched the floor. Even with her breast hanging under her, they did not touch the ground. Her arms trembled after thirty. She forced herself to do another ten.
Lunges followed, then crunches, then more stretches. Sweat beaded on her forehead and trickled down her back by the time she was done. Her breathing was heavy. The exertion felt good. It made her feel alive in a place that tried to strip her of that.
She walked over to the toilet area behind the partition and sat down to relieve herself. The splash of her urine hitting the water was loud in the quiet room, echoing slightly off the smooth walls. She tried to relax her muscles, to let the natural process happen without thought, but her body remained tense. The partition was only waist-high, offering minimal privacy, not that it mattered anymore. She had long since abandoned any sense of modesty in this place. The toilet itself was simple and functional, made of the same smooth, unbreakable material as the rest of the room. There was no tank, just a direct plumbing system that flushed with a quiet hiss when she pressed the small button on the wall. The sound of the flushing water filled the silence for a moment, then faded away, leaving the room as quiet as before.
Then she pressed the second button next to the flush. A nozzle emerged from the back of the toilet bowl and a stream of cool water sprayed up between her legs. The sudden pressure against her most sensitive flesh made her breath catch. A faint shiver of arousal ran through her despite the cool temperature. The bidet function was a small mercy she had grown to appreciate, though it had become more intimate than she ever expected. The gentle but steady stream cleaned her thoroughly, the pulsing water teasing her labia in a way that made her bite her lip to suppress any sound. After what felt like too long, she forced herself to press the button again. The nozzle retracted with a soft click, leaving her wet and tingling.
After pacing the room a few times to dry herself and let the sensation pass, she sat on the edge of the bed to wait. The wait was the hardest part. She never knew how long it would be. Sometimes minutes. Sometimes hours. The lack of a clock in the room made it worse. She had tried counting, but the numbers became meaningless after a while. The only thing she knew for sure was that it would happen. Every day. Without fail.
Eventually, the lock on the door clicked, and the door swung open.
A woman stepped into the room. She was in her late twenties, attractive in a professional way. Her white lab coat was crisp and well-fitted, hugging her figure without a single wrinkle. Beneath it, she wore a sheer black lace bra and matching panties, the delicate fabric just visible where the lab coat shifted with her movement. The sexy lingerie contrasted sharply with the crisp white coat, hinting at something far less professional underneath her polished exterior. Her dark hair was pulled back into a neat ponytail that swayed slightly with each step. Thin-rimmed glasses sat perfectly on her nose, giving her an intelligent, composed appearance. In one hand, she held a clipboard, the other hand resting lightly at her side.
She stood just inside the doorway for a moment, her eyes scanning Lena with calm detachment. The contrast between the two women was immediate. The visitor looked clean, confident, and completely in control. Her makeup was subtle but flawless. Her posture was straight. She smelled faintly of soap and something clinical. Everything about her suggested she belonged to the world outside this room.
Lena remained seated on the edge of the bed, naked and still slightly damp from the bidet. She made no move to cover herself. After all this time, it felt pointless. Her thin body, marked by the weight she had lost, was fully exposed under the bright lights. Goose bumps rose again across her skin as the slightly warmer air from the hallway drifted in. She stared at the woman in the lab coat, studying her the way she always did.
“Good morning, Lena!” the woman said, her voice bright and full of energy. A big smile spread across her face as she stepped further into the room, her ponytail swinging cheerfully. “How are we feeling today? You look great! Did you manage to finish all your exercises? I’m so proud of you for keeping up with them every single day.”
She practically bounced on her heels, radiating bubbly enthusiasm. Her eyes sparkled behind her thin-rimmed glasses as she looked Lena up and down with open approval. She clutched the clipboard to her chest for a second, then flipped a page with quick, happy movements.
Lena sat calmly on the edge of the bed, hands resting loosely on her thighs.
“Morning,” she replied quietly.
The woman in the lab coat didn’t seem to mind the lack of energy in return. She let out a soft, delighted laugh and took another step closer.
“You’re always so chill, I love it! It makes my job so much easier. Okay, let’s see...” She tapped her pen against the clipboard. “As of yesterday, your weight is holding steady even with the smaller portions. That’s fantastic! Your skin looks healthy too. And those goose bumps are just adorable! The temperature must feel nice and fresh this morning, right?”
She tilted her head, ponytail swaying again, clearly in a great mood. Her sheer black lace lingerie peeked out a little more as she shifted her weight, but that was part of her uniform, so natural to her she barely noticed.
“It’s the same as always,” she said in a calm tone.
The woman smiled even wider, as if Lena had just told her something wonderful.
“Exactly! Consistency is so important. You’re doing amazing, Lena. Really.” She made a few quick notes on her clipboard, humming a little tune under her breath while she wrote. “Well, come on. Let’s get you to the showers. Fresh and clean for the day ahead! Up we go!”
She waved her hand toward the door and Lena stood up without a word and walked past her into the hallway. The air out there was always a little warmer, the lights a bit softer. The woman followed closely, her heels clicking on the polished floor as she chatted away, her cheerful voice echoing slightly in the corridor.
“Have I told you how much I love your posture? So straight! It really suits you. And you’re so obedient, not like some of the others. They can be such a handful, but you? You make everything feel like a breeze. It’s honestly refreshing.”
They reached the door at the end of the hallway. The woman pressed a button on the wall and the door slid open with a soft whoosh. Inside was a small shower area, tiled in white and gray. A single shower head hung from the ceiling, no curtain or enclosure. Just an open space with a drain in the middle.
Lena stepped inside. The woman leaned against the doorway, still smiling, watching with cheerful interest.
“Go ahead and get started,” she said, making a little shooing motion with her hand. “I’ll be right here to make sure everything’s perfect. You know how we do!”
Lena turned on the water. It came out warm, just the way she liked it. The spray hit her skin, and she closed her eyes, letting the heat soak into her body. The woman stayed where she was, humming quietly to herself and tapping her pen against the clipboard.
“You know, Lena,” she said after a moment, her voice still bright, “I think you’re one of my favorites. Not that I’m supposed to have favorites, but it’s hard not to when someone is so easy to work with. You’re just so calm and agreeable. It makes everything flow so smoothly, don’t you think?”
Lena didn’t respond. She ran her fingers through her hair, working the shampoo into a lather. The scent of it was light and clean, nothing like the fruity stuff she used to use at home.
“I used to hate coming here, you know?” the woman went on, her tone as cheerful as ever. “I thought it would be so boring. But then I met you and the others, and honestly, it’s kind of fun! Especially on days like today. You’re in such a good mood, I can tell.”
Lena rinsed her hair and reached for the soap. She scrubbed her arms and chest, the suds sliding down her flat stomach and between her legs. The woman watched, still smiling, making little notes now and then on her clipboard.
“Your skin is looking so smooth,” she commented. “I bet that feels nice. You’ve really got a natural glow going on. It’s lovely. Oh, don’t forget to give your vagina a good cleaning too! It’s important to keep everything fresh down there.”
She laughed lightly, as if she had just made the funniest joke. Lena said nothing. She ran her soapy hands between her legs, washing herself thoroughly as instructed. The warm water and soap felt soothing, but she kept her expression neutral.
“Perfect! See? You always know exactly what to do.” The woman clapped her hands together once, delighted.
Lena stood under the spray, staring at the woman through the water.
“Ah, I see you know it’s time for this.” She pulled a razor from her pocket, making another happy little sound. “Shall we get the pubic hair taken care of? You’ve been doing so well at keeping it all neat and tidy. I just love how smooth you look afterward. Come get it.” She held it out with both hands, as if presenting a gift.
Lena stepped forward, still dripping wet, and stood before the woman. Her small, firm breasts glistened under the lights. Her nipples were hard from the cool air outside the spray. Water dripped from her thin body onto the floor.
“I’m sure I don’t need to remind you what happens if you do any funny business with that razor,” the woman said, wiggling it a little between her fingers.
Lena grabbed the razor from her and sighed.
“I’m already smooth, why do I have to shave again?,” she muttered.
“You know the rules, Lena!” the woman said, her tone still bright and full of energy. “We have to make sure you’re as smooth as possible. I would really hate to have to discipline you again. It makes me so sad when that happens. But I will if I have to!”
Lena did not answer. She stepped back into the shower spray and sat down on the floor with her legs spread. The warm water continued to rain down on her as she ran the razor over her already smooth vagina. The woman watched with intense interest, her eyes flicking between the razor and Lena’s face.
“That’s it,” she said. “Nice and slow. You don’t want to miss any spots.”
Lena took her time, moving the razor carefully, pressing just hard enough to remove even the finest hairs without leaving any redness. The task was tedious, but she had done it so many times that it felt almost automatic. When she finished, she rinsed the razor and stood up, her skin perfectly smooth under the water.
“Beautiful,” the woman said, clapping her hands again. “Just beautiful! You did such a good job. Just throw the razor in the bin by the door, thank you.” She pointed to a small, silver bin next to the doorway, then made a little note on her clipboard.
Lena walked over and tossed the razor into the bin. The sound of it clattering inside was dull. She stepped back under the shower and let the water wash away the soap. The woman watched with the same cheerful smile, as if she were admiring a work of art.
When Lena finally turned off the water, the room went quiet except for the drips falling from her body. She stood still for a moment, letting the air dry her skin.
“Alrighty,” the woman said brightly. “Time to dry off and get you off to testing! You’re going to do great today, I can feel it. Here, let’s get you a towel.”
She reached outside the door and pulled a soft white towel from a hook. She unfolded it and held it out to Lena with both hands, smiling like a mother helping her child.
“Thank you,” Lena said quietly, taking the towel and drying herself off. The fabric felt warm against her skin.
“Don’t mention it! Now, let’s get moving. The sooner we get to testing, the sooner it’s done!”
The woman stepped aside and motioned for Lena to walk ahead of her. Lena wrapped the towel around herself and left the shower room, walking down the hallway with the woman close behind. The sound of their footsteps filled the space, her bare feet quiet against the polished floor, the woman’s heels clicking with each step.
They reached a door at the far end of the hall. The woman pressed a button and the door slid open.
The room beyond was larger and brighter than Lena’s cell. In the center stood a surgical bed that was padded with white vinyl. The top half was flat like a normal bed, but raised up at the halfway point. The bottom half, however, split into two separate sections that could be adjusted and spread apart. leather straps waited at the ends of each leg rest, ready to hold ankles in place and keep the legs wide open. Bright overhead lights hung above the bed, currently turned off but clearly designed to illuminate every detail.
“Ta-da!” the woman exclaimed happily, spreading her arms wide as she stepped inside. “Welcome to the exam room! Doesn’t it look nice and clean today? I made sure everything was perfect for you. Come on in, Lena. You can drop the towel.”
Lena walked in calmly, her expression unchanged. She unwrapped the towel from her body and dropped it, once again fully naked. Goose bumps rose across her thin frame as the cooler air of the exam room touched her skin. She glanced at the split surgical bed and the open split without comment, then looked back at the woman.
The woman in the lab coat clapped her hands together again, her ponytail bouncing with excitement.
“You’re going to love how smooth this goes today. Hop right up! No need to be nervous. You’re a pro at this. I know you know the drill by now.” She smiled brightly, adjusting her glasses as she held her clipboard. “This is my favorite part. You always look so pretty on the bed. Just climb up and get comfortable, and I’ll make sure you’re snug and safe. We’ve got a fun day ahead.”
Lena said nothing. She moved to the bed without hesitation, climbed onto the padded surface, and slowly placed herself into position.
The position forced her legs apart, exposing her smooth, freshly shaved pussy completely under the bright lights. She leaned back against the inclined upper section, arms resting at her sides, and let out a quiet breath. Her small breasts rose and fell steadily with each calm inhale.
“There we go! Look at you, so cooperative and perfect. I’m so proud of how far you’ve come.” She stepped closer, her heels clicking on the tile floor, and reached for the leather straps at Lena’s ankles. “Now let’s get you all nice and secure. We don’t want any wiggle room, do we?”
Lena watched silently as the woman tightened the first strap around her right ankle, pulling it just firm enough to keep her leg in place without causing discomfort. She moved to the left ankle next, securing it in the same way. The woman paused and smiled up at Lena, her expression cheerful.
“Comfortable? Good! I knew you’d be. Now, let’s strap down the rest of you.” She leaned over Lena and buckled a strap across her waist, then another across her chest, just above her small breasts. Lena’s breathing remained steady, her face calm as she watched her ability to move be reduced to almost nothing.
“You’re doing amazing, sweetie,” the woman said as she finished adjusting the last strap. She stepped back and admired her work, her ponytail swaying as she nodded in approval. “You look fantastic. Absolutely perfect. Ready to start?”
Lena said nothing. She simply waited.
“Perfect, I’ll go get the doctor. He’ll be so excited to see you. Don’t move, okay? Not that you can.” She giggled lightly and left the room, her heels clicking down the hallway until the door slid shut behind her.
For a few minutes, Lena lay alone on the bed, the bright lights above casting a cool glow over her naked body. The air was still and quiet, broken only by her soft breathing. Her legs remained spread wide, held firmly by the straps. Her hands twitched slightly against the restraints, but she made no attempt to struggle. She knew better.
The door slid open again and two people stepped inside. One was the same cheerful woman in the lab coat, still holding her clipboard and smiling. The other was a tall, thin man dressed in a similar white coat. His face was sharp, with a neatly trimmed beard and intelligent eyes behind wire-rimmed glasses.
He was wheeling in a large metal contraption. The heavy device rolled smoothly on sturdy wheels, its frame made of polished steel with mechanical arms and a long piston mechanism. Mounted at the end was a thick, phallic-shaped attachment made of shiny black silicone. It was clearly a fucking machine, already coated with a generous layer of clear lubricant.
The woman’s face lit up with even more excitement.
“Ooh, here comes the main event!”
The doctor positioned the contraption carefully between Lena’s spread legs. He adjusted the height and angle until the thick shaft was lined up directly with her smooth, exposed entrance. Once satisfied, he slid it forward until the tip of the silicone phallus was touching her entrance, applying just enough pressure to spread her lips around its girth but not enter her. Lena’s body tensed slightly as the cold lubricant made contact with her bare skin, but she remained silent.
He knelt down and began bolting the heavy base securely to the floor using thick metal anchors, locking it firmly in place so it could not shift even an inch. As he worked, the wheels of the machine were lifted off the floor by the bolts tightening into place, leaving the device completely immobile. He double-checked each bolt, tugging on them to ensure they were snug and solid.
Meanwhile, the woman started adjusting the controls. Dials on the side of the machine allowed for precise changes to speed, angle, and rhythm. She clicked a few switches and the machine let out a soft hum as it powered on.
“Everything looks perfect,” the doctor said, his voice smooth and professional. He rose from his crouched position, giving the machine one last check to confirm it was locked tightly into place. “Good morning, Lena. No pain or discomfort?”
“No,” Lena said quietly, her eyes fixed on the ceiling.
The doctor nodded once, pulling a small tablet from the pocket of his lab coat. He tapped the screen a few times before looking down at her restrained form.
“Excellent. Any unusual soreness in your joints or muscles from yesterday’s session?” he asked in a calm, clinical tone.
“None,” Lena answered flatly.
“How would you describe your level of natural lubrication right now? On a scale of one to ten.”
Lena paused for half a second, then replied in the same chill voice.
“Maybe a four.”
He made a note on his tablet.
“Understood. Any lingering sensitivity from the last test?”
“No.”
“Have you experienced any unexpected orgasms since yesterday’s session?”
“No.”
“Good. What about your bladder? Any discomfort there?”
“None.” She shook her head.
“Perfect.” He tapped his tablet once more, then looked at the woman beside him. “Leave us for a moment, please.”
The woman nodded eagerly and skipped out of the room, her heels clicking on the floor until the door slid shut behind her.
The doctor turned his attention back to Lena and pressed a button that lowered the top of the bed. She was now lying completely flat with her legs held wide by the straps. His eyes scanned over her with cool detachment before he spoke again.
“You understand what today’s goal is, correct?” he asked.
“I do.”
His eyes moved over her restrained body with cold precision, noting every detail. He stepped forward and adjusted the machine one last time, ensuring the silicone shaft was still pressing lightly against her.
“You’re doing very well, Lena,” he said in a detached tone. “I want you to try and enjoy this as much as possible. Remember to relax. Your body knows what to do. And should you feel the automatically applied lubricate is insufficient, please let us know immediately so we can rectify it.”
He reached up and flipped a switch on the machine. It started slowly, pushing the thick shaft forward just enough to spread her entrance further, lubrication squelching softly. Lena’s breath caught for a moment as the silicone cock entered her, stretching her slightly as it slid deeper into her vagina. Her hands clenched into fists against the restraints. Eventually, it pressed against her cervix, coming to a stop as the machine registered the resistance.
“5’2, same as always.” he muttered to himself, making a mental note as he watched the machine pull back until only the tip remained inside her. “Your vaginal passage has been calibrated for optimal performance.” With that, the machine began to move in a slow, steady rhythm, thrusting smoothly in and out of her. The thick silicone shaft slid easily thanks to the lubricant, but its girth filled Lena completely with each stroke.
The sensation was intense, but Lena kept her face calm, her breathing controlled. The doctor watched her closely, making notes on his tablet as the machine worked her body.
“Good luck, Lena. Call out if anything changes,” he said, turning to leave the room.
The door closed behind him, leaving Lena alone again with the steady, mechanical motion of the machine. It continued fucking her with a steady rhythm, filling her deeply before pulling out and repeating the process. The squelching sounds of lubrication and silicone filled the room, accompanied by the quiet hum of the machine.
Lena stared at the ceiling, her mind drifting as the thrusts continued. She tried to focus on anything other than the fullness inside her. After a few minutes, her body began to respond despite herself. Heat started to build in her lower abdomen, spreading outwards with each deep thrust. Her breathing quickened just slightly.
She didn’t resist the pleasure. She knew better. The machine was designed to bring her to orgasm, and fighting it only made it take longer. Instead, she let herself feel it. The steady thrusts hit her in just the right way, the thick silicone sliding against her walls and pressing against her sensitive spots.
Her thighs tensed against the straps as the pleasure built. The squelching noises grew louder as her arousal increased, more of her own wetness mixing with the lubricant. Her chest rose and fell more rapidly now, her small breasts jiggling with each thrust from the machine.
The orgasm built slowly, like a wave rising in the distance. When it finally crashed over her, it was intense. Her back arched as much as the restraints allowed, a quiet moan escaping her lips. The machine did not stop or slow down. It kept thrusting steadily through her climax, prolonging the sensation until her body went limp on the bed.
A monitor lit up above the bed, its screen glowing with multiple live data streams. It displayed a detailed graph of her vaginal contractions, tracking the intensity, frequency, and duration of each wave with precise numerical values. Timestamps marked every peak and trough, while a separate line showed real-time changes in her internal pressure and muscle tension around the silicone shaft. Another window logged her heart rate, spiking clearly during the orgasm, along with respiratory rate, skin temperature fluctuations across her chest and thighs, and the exact volume of lubrication and natural arousal fluids being produced. A small sidebar even calculated the strength and length of her pelvic floor contractions, comparing them against her previous sessions. The system recorded everything with cold, clinical accuracy.
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