Cover of The Experimental Endeavor (F)

The Experimental Endeavor (F)

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A woman and her girlfriend have a stale sex life and the girlfriend clearly isn't satisfied with toys for penetration; the woman decides to get a new experimental injection to grow a penis. Not only does it work, it also has other unintended side effects like breast growth. The girlfriend loves it, but wants even more.

Chapter 22: Relentless

The world condensed to a single, screaming nerve ending buried deep within her. Evie’s body felt alien, a vessel overwhelmed by sensation, its fuel a toxic cocktail of lust, shame, and a terrifying, boundless potency. Sophie’s weight pinned her to the couch, a sweet, suffocating prison. The air reeked of sex, sweat, and the sharp, chemical tang of her own unnatural release.

Her cock twitched inside Sophie, a live wire. Sophie giggled, a high, breathless sound that cracked into a moan. “Jesus. Are you… are you kidding me?” She shifted her hips, a tiny, exploratory rock. Inside her, Evie’s shaft, which had only just begun its reluctant retreat, swelled violently. It wasn’t a gradual return. It was a dam breaking, a hydraulic surge that forced a punched-out gasp from Evie’s lungs. Veins, thick as cords, stood out against the flushed skin. It was harder than before, a brutal, uncompromising rigidity.

Sophie’s eyes widened. Her fingers, still loosely wrapped around the base where it disappeared into her, felt the transformation. “Oh my god.” The words were a reverent whisper. Then her expression shifted, dissolving into a mask of pure, avaricious glee. She threw her head back and laughed, the sound wild and unhinged. “You’re a fucking machine!”

Evie couldn’t speak. Her mind was a white noise of panic. This isn’t right.It should be over. I should be soft. But her body was writing its own rules, a rebellion of flesh against biology. The sensitivity was gone, replaced by a deep, insatiable ache. The thought of pulling out was unthinkable. The thought of staying buried like this forever was a dark, seductive promise.

Sophie didn’t wait for an invitation. She planted her hands on Evie’s shoulders, her small frame suddenly projecting a feral strength. She lifted herself up, the withdrawal a slow, deliberate torment. Evie watched, hypnotized, as her own glistening length emerged, slick and shiny with their mixed fluids, the head flushed an angry purple. It looked predatory. It looked hurt.

Then Sophie slammed back down.

It was a different kind of fuck now. The initial frantic hunger had been sated, replaced by a terrifying, efficient endurance. Sophie rode her with a ferocious stamina, her body moving with a slick, practiced rhythm. Each impact was a wet slap of skin, a jolt that traveled up Evie’s spine. The couch groaned in protest, its wooden frame scraping against the floorboards.

“Look at me,” Sophie demanded, her voice a ragged command.

Evie’s eyes, which had been squeezed shut, flickered open. Sophie’s face was a portrait of debauched ecstasy. Her makeup was smeared, her red hair plastered to her temples with sweat. Her lips were parted, her breath coming in short, sharp pants.

“Look at what you’re doing to me,” she hissed. She reached between her own legs, her fingers sliding through the wet, tangled hair to find her clit. “I can feel every fucking inch. I’m so full.” She punctuated her words with vicious downward grinds, her inner muscles clenching in a rapid, milking pulse.

Evie’s hands found Sophie’s hips, her fingers digging into the soft flesh. She wasn’t guiding anymore. She was hanging on, a passenger on a runaway train. Her own hips began to meet Sophie’s descents, a jerky, reflexive thrusting. The pleasure was a blunt force trauma, a pile-driver of sensation that left no room for thought, only a deep, animal need for more.

“Yeah, like that,” Sophie moaned, her head lolling back. “Fuck, you’re so deep. You feel that? You’re hitting something… something new.” Her eyes snapped open, locking onto Evie’s with an electric intensity. “Cum in me again. I want to feel you blow. I want you to fucking paint my insides.”

The demand was a trigger. The pressure, which had never fully abated, coiled tighter and tighter in Evie’s gut. Her balls drew up, a tight, aching sack against her perineum. Her thrusts became erratic, desperate. A low growl started in her chest, vibrating up through her clenched teeth.

“I’m—Sophie, I can’t—”

“You can!” Sophie shrieked, her rhythm breaking into a frantic, bouncing frenzy. “Give it to me! DO IT!”

The coil snapped.

Evie’s orgasm wasn’t a release. It was an invasion. It was a seismic event that tore through her, wracking her body with violent convulsions. Her cock seemed to swell even further for a terrifying second before it pulsed, a thick, ropes of come blasting deep into Sophie’s womb. It wasn’t the dwindling spurts of before. It was a flood, a seemingly endless geyser of hot, viscous fluid.

Sophie screamed, a raw sound that was pure triumph. Her body locked, back arching into a rigid bow. Her cunt clamped down on Evie with a paralyzing strength, milking her, pulling every last drop from her shuddering body.

For long seconds, there was only the sound of ragged breathing and the wet, obscene drip of fluids onto the couch cushions below them.

Slowly, Sophie crumpled forward, collapsing onto Evie’s chest. She was a dead weight, boneless and spent. Evie could feel the rapid, frantic flutter of her heartbeat against her own.

And still, buried inside that warm, spent sheath, Evie felt no softening. The organ remained a rigid, throbbing pipe, still half-hard, still insistent. It was a monstrosity.A miracle. A curse.

Sophie nuzzled into the crook of Evie’s neck. “Holy fuck,” she breathed, her voice hoarse. “That was… my god, Evie.” She shifted slightly, and a fresh trickle of fluid, warm and thick, leaked out around the juncture of their bodies. Evie flinched.

“You’re still hard,” Sophie murmured, a note of awe in her exhaustion. She lifted her head, her eyes gleaming with a speculative light. “You’re a fucking phenomenon.”

The word hit Evie like a physical blow.Phenomenon. Not a person. A thing.An event. She stared at the ceiling, the cracks in the plaster seeming to weave and pulse. Clare’s face flashed in her mind—the frustration, the tears, the failure. Clare couldn’t take this. Clare had run from it. Sophie… Sophie had demanded more.Had taken everything. Was asking for more.

“I need water,” Evie croaked. Her throat was sandpaper.

“Mm,” Sophie agreed, but made no move to get up. Instead, she slid off Evie with a wet, sucking pop, finally separating them. Evie gasped at the sudden, cold emptiness. She looked down at herself. Her cock lay against her stomach, glistening and wet, still impressively full, defying all laws of nature and decency. Come and arousal dripped from the tip onto her sweatpants, which were bundled around her thighs.

Sophie stood on shaky legs, wincing slightly. She padded naked to the kitchen, her ass cheeks slick. Evie heard the tap run, the glug of water from a glass. She couldn’t move. She felt dissociated, like she was floating above the couch, looking down at the ruined scene: the stained fabric, the discarded clothes, the pink-haired woman with the impossible body, staring at the ceiling with blank eyes.

Sophie returned, handing her a glass of water. She didn’t sit. She stood before Evie, drinking her own water, her gaze unabashedly roaming over Evie’s exposed body.

She drank deeply, her throat working, her eyes never leaving the thick, glistening shaft resting against Evie’s pale stomach. A slow, fascinated smile spread across her face. “Okay,” she said finally, her voice still husky. “You gotta tell me. What the hell is this?”

Evie closed her eyes, trying to will the thing away. It twitched against her skin, a vulgar reminder. “It’s… complicated,” she whispered.

“Uncomplicate it.” Sophie knelt on the floor beside the couch, placing her glass down with a soft click. Her fingers, cool from the water, traced a feather-light path up Evie’s inner thigh. Evie jerked. “Clare never mentioned this. Not a hint.” Her fingers closed, not around the shaft, but underneath it, cupping the heavy weight of Evie’s balls. She hefted them thoughtfully. “A week ago, you were just Evie.Sweaters. Glasses. The quiet one.”

“I was,” Evie gasped, her hips lifting involuntarily into that cool, knowing touch.

“And yesterday,” Sophie continued, her thumb now stroking the ultrasensitive skin along the base, “it was big. Don’t get me wrong. Monumental. But today?” She leaned in, her breath hot. “Today it feels like it’s trying to turn my fucking organs into paste. It’s thicker. It’s harder for longer.” Her other hand joined, slowly stroking the length until it was once again fully, painfully erect, the head leaking a clear bead of fluid. “So explain.”

“I can’t,” Evie said, the lie brittle.

“You can.” Sophie positioned herself, kneeling over Evie’s hips. She didn’t sit. She just held the tip of Evie’s cock, aligning it with her soaked, swollen opening. She applied the slightest downward pressure. Just the broad, plum-shaped head began to part her, a teasing, impossible stretch. Evie whimpered.Sophie stopped. “How, Evie?”

Evie shook her head, her knuckles white where they gripped the couch cushions. Sophie lowered herself a fraction of an inch, taking just the tip inside the blazing hot clutch of her body, then lifted off again with a wet smack. The emptiness was a physical pain.

“Tell me.” Down again, another half-inch, a slow, searing invasion that made Evie’s vision blur.Up again. The torture was exquisite. Her whole world narrowed to that tiny, slick point of contact.

The words burst from Evie, a desperate confession torn from the deepest part of her shame. “I didn’t have it! A week ago, I didn’t have anything… not like this.”

Sophie went still, her body poised above Evie, her expression shifting from lust to sharp, clinical curiosity. “What?”

Tears of frustration and unbearable arousal welled in Evie’s eyes. “The injection. The fucking… experimental drug. It was supposed to… I don’t know, for Clare. It was stupid. It was so stupid.” She was babbling now, the truth a torrent loosened by the relentless, teasing friction at her core. “It changed me. It’s still changing me. It's still growing”

Sophie’s lips parted. Her gaze dropped to the monstrous thing between them, a look of pure, unadulterated wonder replacing her earlier hunger. “No shit,” she breathed, her voice full of awe. “A science project. A fucking miracle.”

Any fear, any hesitation, evaporated from her face, burned away by a giddy, insatiable curiosity. She kept her eyes locked on Evie’s as she began to sink down again, not with the frantic energy of before, but with a slow, deliberate, consuming gravity. “Let’s see what it learned today,” she whispered.

Evie could only watch, trapped, as Sophie took her, inch by devastating inch, her body accepting the impossible girth with a shuddering, willing grace.

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