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 20: Exploration

The bathroom tile was cold under her feet. A sharp contrast to the fever-warmth of her own skin. She didn’t turn on the light. The gray morning gloom seeped in through the frosted window, painting the room in shades of ash and bone. She stood before the mirror over the sink, her reflection a phantom in the dimness.

Her pink hair was a messy shock against the pallor of her face. Her glasses were on the nightstand. The shape of her was wrong. She leaned closer, her breath fogging the glass.

Her breasts. Clare was right. They were bigger. Not just fuller; they had a new, heavy weight to them, a rounded swell that pushed against the air. They weren't Clare’s size, not even close, but they were no longer the modest handfuls she’d always known. The areolas were wider, darker, the nipples permanently pebbled and prominent. She cupped one, and the sensation was foreign—a dense, yielding weight that sent a confusing, electric jolt straight to her groin. Her gaze drifted down.

Her cock.

It jutted out, a brutal, undeniable fact. Even in the aftermath of Clare’s failed attempt, it had barely flagged. It was rigid, flushed a deep, angry red, the thick veins standing in stark relief. She wrapped her hand around the base. Her fingers didn't meet. She had to use her other hand to complete the circle, her grip strange and awkward. The skin was hot, almost feverish, the pulse within it a deep, steady drumbeat of demand. She gave it a tentative stroke, hissing at the intensity. Every nerve was screaming, raw and exposed. It was too much. It was an animal attached to her, with its own frantic heartbeat.

The sheer bulk of it, the way it curved up towards her navel, obscene and magnificent, made her stomach clench with a mix of awe and revulsion. This was the thing Clare couldn't take. This was the wall between them.

Her gaze dropped further, to the place that felt almost forgotten. Below the heavy root of her cock, nestled in the thatch of darker hair, was her cunt.

She turned on the shower, the sudden roar of water a welcome white noise. Steam began to curl, clouding the mirror, blurring the stranger’s outline. She stepped under the spray, letting the hot needles pummel her shoulders. The water sluiced over her new breasts, over the unbearable hardness of her shaft. It did nothing to calm the ache. If anything, the heat amplified it, made the blood throb more insistently.

Her hand, slick with soap and water, drifted back down. This time, it bypassed the demanding weight above. Her fingers sought the familiar fold, the place that used to be the center of her pleasure.It felt different.

Slicker, yes, her own neglected arousal mingling with the soapy water. The entrance gave way with an ease that was startling. She pressed a single finger inside, then a second almost immediately. There was little resistance, just a soft, yielding warmth.

“Christ,” she whispered to the steam.

She leaned back against the cool tiles, spreading her legs wider under the spray. She worked her fingers deeper, curling them. The sensation was muted, distant, like hearing music through a thick wall. The real show was happening higher up. Each movement of her hand, each clench of her internal muscles, seemed to telegraph directly to the base of her cock, making it jump and twitch against her stomach, a fat, captive beast straining at its leash.

A morbid curiosity took hold. How far had the change gone?

She added a third finger, stretching herself. The stretch was there, but it was a ghost of the searing tightness Clare had fought against. Her body had made room. For what? She thought of the monstrous girth just inches away, and a dark, impossible idea flickered.No. That was insane.

But her body, this new, traitorous architecture, seemed to whisper otherwise.

With a grunt born of frustration and a deep, destabilizing need, she pushed a fourth finger into the slippery clutch of her cunt. Her knuckles strained, her hand forming a crude fist as she buried herself to the heel. It was full. Uncomfortably so. But it wasn’t the blinding, impossible fullness Clare had faced. It was an ache that echoed the one in her cock, a deep vacancy crying out to be filled completely.

She began to fuck herself with her own hand, pounding the heel of her palm against her clit with each thrust. It was a brutal, graceless act. The slick, wet sounds of her fingers pistoning inside her were loud in the tiled space, underscored by the drumming shower. Her head fell back against the wall with a thud.

Her other hand, seemingly of its own volition, snaked up and wrapped around her cock. The moment her fingers closed around that searing heat, everything crystallized. The muted pleasure from below sharpened into a blinding feedback loop. Fucking herself with her hand, her cunt gripping and releasing her own fingers, sent waves of brutal sensation radiating up into the root of her dick. And stroking that thick, veined shaft, feeling the skin slide over the iron core, made her cunt clench and spasm around her invading fingers.

“Fuck… fuck…” she panted, her hips bucking off the wall, driving her hand deeper, pumping her cock faster.

She imagined Clare watching. She imagined Sophie from the rooftop, those knowing eyes. She imagined taking Clare from behind, that impossible thickness breaching her, splitting her open until she screamed. The fantasy was violent, glorious, obscene. It wasn't gentle or loving. It was a claiming. A conquest her own body could now, theoretically, wage.

The pressure built, not as a rising tide, but as a seismic fault line about to rupture. It started deep in her balls, a terrifying, atomic tightness, and exploded outward in a cataclysm that shattered her.

Her back arched violently, her body slamming against the tiles. A raw, guttural shout was torn from her throat, unheard over the shower's roar. Her cock kicked in her hand, and instead of come, a fierce, clear jet of fluid streaked across the shower wall, then another, pulsing out with a force that startled her. At the same time, her cunt convulsed around her buried fingers, a series of racking, milking spasms that drew the orgasm from her very marrow.

She slumped, boneless, sliding down the wall to sit on the shower floor. The water beat down on her bowed head. Her fist was still inside her, her other hand lay limp on her now-softening, but still substantial, cock. Her breath came in ragged, shuddering gasps that echoed in the enclosure.

The clarity that followed was cold and brutal.

She looked at her own hand, at the four fingers slowly slipping from her loosened, well-used cunt. She looked at the remnants of her release, already washing down the drain.This wasn't a solution. This was a mutation. Her body was rewriting its own rules of pleasure, building a highway between two conflicting anatomies, and it was a lonely, desolate road.

She had wanted to give Clare everything. Instead, she had built a monument to her own inadequacy—a tool of such magnitude it was useless, and a hunger so specific it could only be sated by her own hand. The water began to run cold. She didn't move. The chill was a comfort. It felt like the first honest thing she’d felt all morning.

Outside, she heard the bed creak. A drawer opened and closed. Clare was moving, assembling herself for the world. The ordinary sounds of life continuing were a profound indictment. Evie stayed on the floor, under the cold spray, waiting for the feeling in her legs to return, knowing nothing would ever be the same.

The shower curtain rings scraped back with a sharp, metallic sigh. Evie didn’t look up. A draft of cooler air washed over her, followed by the soft thud of Clare’s feet on the wet tile. Clare stood there for a long moment, a pale silhouette against the brighter light of the bathroom.

Clare reached in, her fingers, warm against Evie’s chilled skin, traced the line of her spine, then slid around to her front, over the swell of her new breast, down the taut plane of her stomach. They found Evie’s cock, which, despite the crushing despair, had begun to thicken again at the touch. A low, broken sound escaped Evie’s lips.

“See?” Clare whispered, her mouth close to Evie’s ear. “It doesn’t care. It just wants.”

Clare stepped into the tub, pulling the curtain closed, and turned the water hotter. A cloud of steam billowed, enveloping them. Clare’s body was sleek and firm against Evie’s, her skin heating rapidly. She didn’t speak. Her hands were everywhere, mapping the changes, possessive and desperate.

She turned Evie to face her, their bodies slick and sliding. Clare’s eyes were dark pools, her pupils swallowing the blue. She looked feral. Reaching down between them, she took Evie’s massive, leaking cock in both hands. It was fully hard again, a brutal weight, the head purple and beading with pre-come that mixed instantly with the shower water.

“Here,” Clare breathed, her voice thick. She guided the thick shaft upward, pressing it between their bodies. The sensitive underside rubbed against the wet, soft skin of Evie’s own lower belly, while the top was sandwiched between Clare’s firm abdomen and Evie’s. But Clare didn’t stop there. She pushed her own breasts together, creating a slick, hot valley, and pulled Evie closer, trapping the monstrous cock between their chests.

“Oh, god,” Evie choked out.

Clare kissed her then, a deep, swallowing kiss that tasted of salt and stale coffee. It was not tender. It was a claim. She began to move, rolling her hips and shoulders, rubbing her body up and down the trapped length. Her stiff nipples dragged along Evie’s shaft through the wet friction of their skin.

“You feel that?” Clare gasped against her mouth. “You feel what you do? Even like this… you fill me up.” She ground herself against the part of Evie’s cock that pressed into her lower belly, seeking pressure on her clit. Her movements became jerky, urgent. “Fuck, Evie. It’s so fucking big. I can’t take it inside. But I can take it like this. I’ll take every fucking inch like this.”

Her words unraveled Evie. The visual was obscene. Watching Clare, this powerful, controlled woman, reduced to frantically humping the outside of her, using their combined bodies as a crude, wet sheath for the thing she couldn’t accommodate. Evie’s hands flew to Clare’s ass, gripping the firm muscles, pulling her harder, faster against her. She bucked her own hips, driving her cock up through the tight, slick channel of their breasts.

The steam filled their lungs. The sounds were filthy: the wet slap of skin, Clare’s ragged moans swallowed by the shower’s spray, the choked, animal noises Evie didn’t recognize as her own. Clare’s kiss became biting, her teeth on Evie’s lip. “Come on,” she snarled. “Give it to me. Cover me.”

It was a command. The tension that had been coiled in Evie’s gut since she woke—the fear, the awe, the crushing inadequacy—snapped. Her orgasm ripped through her with a violence that made her legs buckle. She slammed Clare back against the tiled wall, pinning her there as her cock jerked and pulsed between their crushed bodies.

Thick, hot ropes of come shot up, streaking Clare’s neck, her chin, her collarbone. It painted white stripes across her breasts and pooled in the valley between them, mixing with the water before being washed down in rivulets over her stomach. Clare cried out, her own climax triggered by the feel of it, by the brutal claiming. She shuddered against the tiles, her cunt clenching around nothing, a series of sharp, desperate spasms.

They slumped together, breathing in ragged unison. The water began to cool again. Evie looked down at the mess she’d made of Clare, at the evidence of her own brutal potency splattered across her girlfriend’s skin. Clare’s eyes were open, staring back. There was no triumph in them. Only a deep, exhausted hunger, and a dawning, terrifying understanding.

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