Chapter 7: The Peptide Protocol
The medical suite smelled of isopropyl alcohol and cold tile. Dominic stood just inside the door, the sterile air raising goosebumps on his arms. It was a procedure room, all functionality. A stainless steel instrument tray gleamed under the bright LED panels. A treatment bed, covered in crisp white paper, dominated the center.
Dr. Evelyn was not what he’d expected. She was perhaps sixty, with cropped silver hair and eyes the color of flint behind wire-rimmed glasses. She wore a white coat over casual slacks, a stethoscope draped around her neck like a subdued accessory. She looked from Lena to Dominic with the assessing gaze of a mechanic.
“This him?” she asked, her voice dry and precise.
“This is him,” Lena confirmed. She placed a hand on the small of Dominic’s back, guiding him fully into the room. The door hissed shut.
“The subject of the recalibration,” Dr. Evelyn said, lifting a tablet. She scrolled. “Base endocrine panel is robust. TRT protocols are optimal. The existing neural pathways are, as hypothesized, fixated on distal stimulation. The goal is proximal amplification.” She set the tablet down and looked at Dominic. “You understand this is a biochemical intervention. It is not magic. It is targeted neuroplasticity.”
Dominic found his voice, though it felt thin. “You’re going to… make it feel more?”
“I am going to enhance the signal-to-noise ratio of specific nerve clusters,” she corrected, turning to the steel tray. She picked up a sealed vial, its clear liquid catching the light. “BPC-157. For tissue repair and receptor upregulation at the site. PT-141. A melanocortin agonist. It will increase subjective arousal states, bypassing traditional dopamine pathways. It creates a… background hum of want.” She picked up a second, smaller vial, this one with a pale blue solution. “And this is the custom peptide. It binds selectively to sensory nerve endings in the prostate and the posterior pharyngeal wall. It makes them more excitable. More receptive to mechanical stimulation.”
She loaded a syringe, the thunk of the plunger pulling fluid loud in the quiet room. A bubble of air was flicked away with a practiced tap. “Over eight weeks, with daily administrations, these compounds will alter your subjective experience of penetration. The pleasure will not just be mental, or even just physical. It will become neurological. Overwhelming. By the protocol’s end, a cock in your ass won’t just feel good. It will feel like your central nervous system is being struck by lightning.”
Dominic’s mouth was dry. He saw Lena watching him, her arms crossed, a slight, unreadable curve to her lips.
“Kneel on the bed,” Dr. Evelyn instructed. “Expose the upper left glute.”
The paper crinkled under his knees as he obeyed, pushing down the loose sweatpants Lena had given him. The air was cold on his skin. He felt the wipe of an alcohol pad, a shocking cold swipe.
“Deep intramuscular,” the doctor said, not to him. The needle was a brief, sharp pinch, then a slow, burning pressure as the cocktail was depressed. She withdrew, placing a small bandage over the spot. “There will be localized soreness. A feeling of warmth. That’s normal. The PT-141 may cause mild flushing, slight nausea. It will pass.”
She handed Lena a small case. “Thirty pre-loaded syringes for the first month. Instructions are inside. Rotate injection sites. Same time every day. Consistency is critical.”
Lena took the case. “And the effects? The timeline?”
“By week two, he’ll report heightened sensitivity during acts. A deeper, more diffuse warmth. By week four, prostate stimulation should trigger involuntary motor responses—tremors, vocalizations. The pleasure will begin to eclipse any memory of penile-centric orgasm. By week eight?” Dr. Evelyn removed her glasses, cleaning them on her coat. “With dual penetration? The sensory input could be incapacitating. It approaches a seizure threshold of pleasure. The body can only process so much. He may black out.”
Dominic’s heart hammered against his ribs. The idea was terrifying. It was the logical, biochemical end of the path he was on. To be fucked into unconsciousness.
“Thank you, Doctor,” Lena said.
“Follow the schedule. Monitor his responses. Note anything anomalous.” Dr. Evelyn gave Dominic one last, flat look. “You’re volunteering to become a sensory experiment. Your body will no longer be your own. It will be a vessel for amplified signal. Ensure your mistress documents the results.”
She left, the door clicking shut behind her with finality.
The warmth began as a dull ache in his ass cheek, then spread, a slow, radiating heat that seeped into his pelvis. It was a physical feeling, but it carried a psychic weight. The injection was inside him now, working. Rewiring.
“On your back,” Lena said. Her voice had changed. It was colder, edged with a scientific curiosity. “Legs up. Let’s establish a baseline.”
He lay back on the crinkling paper, his legs falling open. The position was profoundly vulnerable. The cage was a dull, heavy presence, but the new warmth in his body seemed to flow around it, ignoring it.
Lena didn’t don the strap immediately. She pulled on a pair of thin latex gloves. She lubed two fingers, her eyes on his face. “Report the sensation. Exactly.”
She pressed a finger against his hole, still loose from the previous night’s conditioning. She pushed in, a single digit. The stretch was familiar, but the internal sensation was… brighter. A clear, distinct spark along a nerve he hadn’t known was there.
“It’s… sharper,” he breathed.
“Where?”
“Inside. Deep. A kind of… pinpoint heat.”
She crooked her finger, searching. When she found his prostate, it was no longer just a button of pressure. It was a live wire. A jolt of pure, electric pleasure shot up his spine, completely divorced from his caged cock. His hips jerked off the table.
“Fuck!”
Lena’s eyes widened slightly. She pressed again, more firmly. Another jolt, stronger. He gasped, his back arching. It was too much. It was not enough.
“That’s the peptide,” she murmured, more to herself. She withdrew her finger. “Baseline established. Now, we condition.”
She stepped away, the familiar sound of the harness straps followed. She chose a different dildo tonight, slightly thicker, with a pronounced curve. She slicked it with gel. She moved between his raised legs, the silicone head nudging against him.
“This is the only thing that matters now,” she said. Her voice was low, intent. “This feeling. This hole. You come from this, or you don’t come at all. Your dick is decoration.”
She pushed.
The fullness was immediate, overwhelming. The curve drove directly into the hyper-sensitized bundle of nerves. The sensation wasn’t just in his ass; it flooded his pelvis, his gut, a radiating wave of raw, shocking pleasure. He cried out, a strangled sound.
“Oh god… Lena…”
“Shut up,” she said, beginning to move. Her thrusts were slow, deliberate, each one a calculated stroke along the new, fiery pathway inside him. “Just feel it. This is what you bought. This is what you are.”
He was drowning in it. Every inward stroke lit him up from the inside. His body was no longer his own. It was a collection of screaming nerve endings, all connected to the point of invasion. He babbled, pleas and curses mingling. “Fuck, yes, right there, please, don’t stop, it’s too much, it’s too much…”
She didn’t stop. She settled into a ruthless, pounding rhythm. The paper tore beneath his grasping hands. The metal bed frame rattled. His world condensed to the slide of silicone in his ass, the brutal, glorious pressure on his prostate. The cage was forgotten. His dick, trapped within it, was a distant satellite.
The pleasure built in a new way. It wasn’t a tightening coil in his groin. It was a rising tide, a thermal bloom in his core, spreading outwards until his fingers and toes tingled with it. He was so hard inside the cage it hurt, but the pain was irrelevant data, static against the main signal.
“I… I can’t…” he sobbed, overwhelmed.
“You can,” Lena grunted, her own breathing labored with effort. “You will. This is your orgasm now. Let it happen.”
The tide crested. It broke not with a single explosive peak, but with a series of devastating, rolling waves. His body seized, back bowing violently off the table. A thin, desperate sound was torn from his throat. And from the tip of his caged, untouched cock, a pathetic stream of fluid leaked out, pulsing in weak, shameful spurts onto his stomach. It wasn’t the powerful, muscular release of before. It was a seepage. An overflow valve blowing on a system overwhelmed by input.
Lena watched it happen, her thrusts slowing. She saw the clear evidence of his anal-only climax, a trickle of surrender. A triumph of biochemistry and will.
She pulled out slowly. Dominic collapsed, boneless, trembling through the aftershocks. The waves of pleasure continued to echo through his rewiring nervous system, long after the physical act had stopped. He felt raw. Reconfigured.
Lena stripped off the harness. She looked down at him, at the mess on his stomach, the leaking cage. She didn’t smile, but her expression was one of deep, cold satisfaction.
“Day one,” she said, her voice quiet in the humming sterile room. She picked up the case of syringes. “Only fifty-five more injections to go.”
She left him there on the medical bed, crumpled and shaking, the new heat in his body already beginning to mingle with a dawning, terrifying understanding. This was just the beginning. The synapses were firing on new pathways. His old pleasure was dead. This new, overwhelming, all-consuming sensation was now his truth. And it was just getting started.
And it was just getting started.
The crinkling paper was the only sound for a long moment. Dominic’s tremors subsided into fine, persistent shivers, the echoes of the neural earthquake still vibrating in his bones. He stared at the acoustic tiles of the ceiling, his mind a white blank of overload.
Lena moved away from the bed. She opened a cabinet, the metal door swinging with a soft sigh. When she turned back, she held a small, high-definition camcorder. Its red recording light was a malevolent pinprick in the sterile glow.
She raised it, framing him in the screen. His sprawled, used body. The shiny trail of his own spent fluid on his abdomen. The cage. The focused intensity on her face was no longer that of a lover or even a strict dominatrix. It was that of a researcher. A chronicler.
“She records it,” Lena said, her voice flat. The statement was not for him. It was an annotation. The whir of the camera’s internal mechanism was barely audible. “Subject exhibits post-stimulus neuromuscular tremors. Fluid emission was achieved via targeted prostate stimulation, absent of direct penile contact. Volume was minimal. Consistency was thin. A classic sissygasm.”
The clinical terms cut through his haze. He turned his head on the paper, the movement slow. He saw his own diminished reflection in the camera’s lens.
“Can you… not?” The words left him weakly.
The camera didn’t waver. “This is data. Madame Seraphina requires it. I require it.” Lena took a step closer, zooming in on his face. “Tell me what you felt. Be precise.”
He swallowed. His throat was raw. “It was… huge. Like it was everywhere. In my stomach. My legs. Not just in my… ass.”
“Describe the peak.”
“It wasn’t a peak. It was a… collapse. My whole body just gave up. The cum just… leaked out. Like it was an accident.” Shame heated his cheeks, a futile counterpoint to the cool air.
Lena lowered the camera slightly. “Good. That’s the point. An accident of pleasure. A byproduct.” She hit a button, stopped recording, and set the camcorder on the instrument tray. Its light went dark. “Now we see how quickly the feedback loop establishes.”
She approached the bed again. Her gloved fingers, still slick, didn’t go for the harness. They went back to his ass. One finger, then two, slid into him with an obscene, wet sound. He was open, loose, hyper-sensitive.
The touch was a spark on tinder.
“Ah! Christ…” His hips twitched. The soreness was there, a dull background throb, but the peptide-amplified signal screamed over it. The two fingers curled, massaging the tender, swollen gland. Pleasure, sharp and bright as a shard of glass, lanced through him.
“You’re still responsive. Very responsive.” Her voice held a note of genuine fascination. She scissored her fingers slightly, stretching him. “The tissue is flushed. Inflamed. Every nerve ending is shouting.”
She withdrew. He heard the snap of the harness buckle. “We need a deeper baseline. Get on your knees. Face the wall.”
He moved clumsily, his limbs coordination shot. The paper tore further as he rolled over and pushed himself up. The steel bed frame was cold against his forearms. He presented himself, his head hung low. The position was one of absolute offering, of animal submission.
Lena didn’t hesitate. She positioned herself behind him. The broad, curved silicone head nudged against him, a blunt promise. She didn’t ease it in. She used the gel-slick weight of her body to sink it into him with one relentless, continuous push.
He screamed. The fullness was catastrophic. It wasn’t just filling him; it was illuminating him from the inside, mapping every millimeter of his colon with fire. The curve hit its target with unerring accuracy, a constant, devastating pressure on his prostate.
“Fuck! Lena, stop, it’s too much, I can’t—” The plea was ragged, torn from a place of primal overload.
She gripped his hip with one hand, the other braced against the wall for leverage. “You can. You will. Your body doesn’t get to say ‘no’ anymore. It only gets to feel.” She pulled back and slammed home.
The impact rocked him forward. His vision sparked. She set a brutal, piston-like rhythm, each thrust a calculated demolition of his old sensory limits. The slap-slap-slap of her body against his ass was a metronome of his unraveling.
“Your hole is so greedy for it,” she grunted, her own breath coming faster. “Look at you. Taking it all. You’re made for this. This is your function.”
He was beyond words. Sound spilled from him: choked sobs, guttural moans, high whines that broke in his throat. The pleasure was a tsunami now, eroding every mental barrier. He was just a conduit for sensation, a wet, tight sheath being used to generate data. His caged dick ached, a trapped, throbbing irrelevance.
The buildup this time was different. It didn’t creep. It detonated.
One particularly deep, grinding thrust did it. His body locked, seized in a rigid arc. A silent scream stretched his mouth wide. Inside the cage, his clamped dick pulsed violently, and another, thicker stream of cum jetted out, splattering against the crumpled paper beneath him. It was stronger than the first, a reflexive expulsion of pure, neuromuscular signal.
He crumpled, boneless, as she kept fucking him through it. The sensations continued to riot in his nerve endings, even as his conscious mind flickered. She gave him five more strokes, each one milking a weak, aftershock twitch from his spent body.
Finally, she stopped. Buried deep. She held there, letting him feel the full, impossible stretch. Then she pulled out with a slow, wet scrape.
Dominic collapsed onto the bed, a puddle of trembling flesh and cooling fluids. He was hollowed out. Rewired.
Lena unstrapped the harness. She picked up the camcorder again. The red light winked back on. She panned slowly over the wreckage of him: his shuddering back, the fresh pool of cum, the glistening, used hole that still fluttered weakly open.
“Recording continued,” she said, her voice cool and clear. “Second anal-induced emission achieved within fifteen minutes of the first. Volume increased. Subject’s resistance threshold appears to be lowering. Pleasure responses are escalating in intensity and somatic reach.” She zoomed in on his face, his eyes closed, tears cutting tracks through the sweat on his temples. “Psychological surrender is total. The protocol is effective.”
She stopped recording. The silence that followed was absolute, broken only by the hum of the air filter and his ragged, struggling breath.
“Get up,” she said, not unkindly, but with utter finality. “Clean yourself. We go home. Your injection is at nine tomorrow morning.”
The words were a sentence. A promise. Fifty-five more injections. A body learning a new, devastating language of touch. He somehow pushed himself up, his movements those of a very old man. As he shuffled to the sink, the empty, hyper-sensitive ache in his core felt less like an ending and more like a hungry, gaping mouth. Waiting.
The waiting was a physical space inside him now, hollow and resonant. Lena drove in silence, the case of syringes on the backseat like a patient bomb. Dominic stared at the passing streetlights, their streaks of orange smearing the window. His body felt alien, the injection site a warm, tight knot of potential, his ass a tender, well-used channel still humming with ghost vibrations.
At her apartment, she pointed to the bathroom. “Shower. Cold. Don’t touch the cage.” Her tone brooked no discussion.
The water was a shock, sharp needles on his overheated skin. He soaped himself mechanically, watching the evidence of his training—the lube, the faint streaks of his own spend—swirl down the drain. The cage looked obscene under the stream, a chrome and leather chastity device enclosing flesh that now felt like a vestigial organ, a remnant of a simpler, less truthful biology. He leaned his forehead against the cool tile, the water pounding his shoulders. This was the quiet after the earthquake. The rubble of his old sexual self lay scattered inside him. The clarity was brutal. This wasn’t play. This was becoming.
A towel appeared over the shower rod. He dried off, avoiding his own eyes in the mirror. In the bedroom, Lena had laid out his kennel—the cushioned mat, the light blanket. She was sitting at her small desk, the camcorder plugged into her laptop, the glow of the screen illuminating her focused face.
“She’s reviewing the first clips,” Lena said, not looking away from the monitor. Dominic could see his own contorted face frozen on the screen, mouth agape in a silent scream. “She wants a verbal report on the subjective effects. The warmth. The exact location of the sensations.”
He knelt on the mat, the habit ingrained. “It’s… a deep heat. In the pelvis. Like a hot stone lodged there. The feeling in my… prostate… it’s not just pressure anymore. It’s a current. Like licking a battery.”
Lena typed as he spoke. “And the emissions?”
“They felt… incidental. Like a sneeze. My body just… evacuated.” The shame was still there, but it was morphing into a stark, clinical fact.
Lena sent the message. A reply chimed almost instantly. She read it, her lips tightening slightly. “She says the second emission showed more volume because you were more thoroughly opened. The biological plumbing was simply clearer. She says…” Lena paused, then read verbatim. “The pleasure is the point. The fluid is just proof of complete neurological capture. Remember the axis.”
The axis. Her authority. The organizing principle of every atom of his desire. The phrase, delivered through Lena, settled the last of his trembling. This was all under her knowing gaze. Every spike of pain, every jolt of rewired pleasure, every humiliating leak—it was all data sanctified by her attention. His congruence was her design.
“Tomorrow,” Lena said, closing the laptop. “The injection is at nine. Then we work on your throat.”
Morning came with a deep, unfamiliar ache in his glute and a restless thrum in his bloodstream. Lena administered the second syringe with the same dispassionate efficiency as the doctor. The pinch, the burn. “Rotate sites,” she murmured. “Left glute today, right tomorrow. Keeps the receptors fresh.”
By afternoon, the effects were more pronounced. A low-grade, buzzing arousal hummed in the background of everything, the PT-141 crafting a perpetual state of want from his own chemistry. When Lena ordered him to kneel in the living room, just to kneel, his heart hammered. The anticipation was sharper than any touch.
“Open,” she said, standing before him. She wasn’t wearing the harness. She held a dark, realistic dildo in her hand, one he hadn’t seen before. It was uncannily detailed, veined and heavy-looking. “We’re conditioning the other pathway. Your throat’s turn.”
She slicked it with a tasteless gel. The first touch of the silicone head against his lips made him flinch. The peptide sensitivity wasn’t confined to his ass; a weird, sharp awareness lit up the back of his mouth.
“Take it. All of it. Don’t gag.”
He opened his jaw. She pushed the head in. It was thick, wider than the strap she usually used. It stretched his lips, bumped over his tongue. He focused on breathing through his nose, on the feel of the material, the submissive act itself. But his body, under the influence, was translating the mechanical pressure into signals of startling clarity. The sensation as the head pressed into his pharynx was a bright, singular spark.
“Deeper,” Lena commanded, her hand firm on the back of his head. She pushed forward steadily. The head breached his throat sphincter. His eyes watered instantly, reflexively, but beneath the panic of obstruction was a shocking, electric sizzle along the nerves of his gullet. A garbled choke escaped him.
“Good,” she said, her voice cool. “Feel that? That’s the new wiring. Your throat is learning to be a cunt, too.” She began to fuck his face with slow, deep, punishing strokes. Each inward thrust stretched his throat open, a raw, full feeling that triggered the enhanced nerve endings. It wasn’t pleasure as he’d ever known it. It was a profound, submissive receiving, a physical truth that vibrated in harmony with the deepest chord of his identity. He drooled copiously, spit and gel running down his chin, dripping onto his chest.
She watched his face, his streaming eyes. “You love this,” she stated, not asking. “This is what you spent forty years looking for. This right here. Being used as a hole. Knowing she knows exactly how it feels.”
He couldn’t speak. He could only moan around the invading length, the sound vibrating up the silicone into her hand. His caged cock strained, a futile, aching prisoner. The arousal from the face-fucking mingled with the latent heat from the injection, creating a feedback loop of desperate need. She was right. This was the core, stripped of all costume, all fantasy. Receptivity. Authority. The two pure elements.
After what felt like an age, she pulled the dildo out with a wet, sucking pop. He gasped, air burning his raw throat. She held the shiny, spit-covered thing in front of his face. “Look at your work. You polished it with your insides.” She then did something unexpected. She pressed the slick, cool head against his furled asshole, which clenched instinctively. “Both ends. Both pathways. Your body is one continuous fuckhole now, Randi. It’s all just a matter of which one she wants to use.”
Days blurred into a routine of chemical and carnal conditioning. The injections became a daily sacrament, the bite of the needle a precursor to the flood of warmth, the buzzing want. Lena’s methods were varied, scientific. Some days were dedicated to endurance: her strapping him down and fucking his ass with a steady, metronomic pace for an hour, documenting the precise minute his body would spasm and leak. Other days focused on depth training, her working a longer, thinner toy into him until he felt stuffed into his very colon, the pleasure so deep it felt like a internal organ was having a seizure.
His throat training progressed to the point where she could skull-fuck him with the realistic dildo until his vision spotted, the glorghing, wet sounds filling the room, his enhanced nerves translating the rough penetration into a dizzying cascade of signal.
Through it all, the recordings continued. Lena was a meticulous archivist. Close-ups of his leaking cage. The gaping, glistening state of his hole after a session. The dumb, blissed-out emptiness in his eyes after a particularly violent throat-fucking. She sent clips nightly. The replies from Madame Seraphina were terse, directive. “Increase amplitude.” “Test resistance with thicker diameter.” “The emissions are still too conscious. They should surprise him.”
Three weeks in, the change was not just in his body, but in his mind. The desperate, goal-oriented ache for a traditional orgasm had faded, replaced by a profound, placid hunger to be used. The cage was not a prison; it was a badge, a guarantee that his pleasure would come only from service, only from the places that truly defined him. He was, for the first time in his life, not wrestling with his nature. He was living inside it, perfectly.
It was a Tuesday evening. Lena had just finished a long, slow session with his throat. He was kneeling, recovering, drawing ragged breaths. She checked her phone, her eyebrows lifting slightly.
“She’s coming,” Lena said, putting the phone down. “Tomorrow night. She wants to see the progress firsthand. She wants to conduct a field test.”
Dominic’s blood went still, then roared in his ears. A field test. Her presence. The source of the axis, in the room.
“She’s bringing a friend,” Lena added, a cryptic, sharp smile touching her lips. “A physical stressor. To see if the wiring holds under… varied input.”
The waiting returned, but it was different now. It was full. It was pregnant with purpose. Every amplified nerve in his body seemed to align, pointing toward the next evening like iron filings to a magnet. This was the scarcity, the anticipation, the wanting that was the very engine of his arousal. Her authority was about to become tangible, a force in the room with him. He lowered his forehead to the floor, a silent, trembling prayer of readiness. The congruence was complete. He was a perfect, tuned instrument. Waiting for the only hand that could play him.