Chapter 28: Final Stretch
The drive home was a blur of streetlights and silence. Clare’s body hummed, a live circuit of need. She sat with her thighs pressed tightly together in the passenger seat, but it did nothing to stem the slow, constant seep of fluid that soaked through her trousers. Every bump in the road sent a jolt through her swollen clit, making her gasp. She kept her face turned to the window, her jaw clenched.
Evie drove, her hands white-knuckled on the wheel. The monstrous weight between her legs was a constant, shameful presence, a thick, veined truth pressed against her zipper. She could smell Clare’s arousal, a muskier, more potent version than she’d ever known, cutting through the antiseptic lab smell that clung to them both. It made her own altered body twitch in response, a traitorous pulse.
They didn’t speak. Words had dissolved in the lab’s sterile air.
The apartment felt alien. Too quiet. The familiar, soft glow of their bedside lamp was a mockery of the sodium lights they’d left behind. Clare walked stiffly to the bedroom, her movements jerky. Evie followed, hovering in the doorway.
Clare didn’t turn on the main light. She stood by the bed, her back to Evie, and began to undress. It wasn’t seductive. It was a clinical, desperate shedding. Her trousers, soaked through at the crotch with a dark, sticky patch, hit the floor. Her blouse followed.
In the lamplight, the change was grotesquely evident.
Her vulva was a dark, prominent shadow between her thighs. The labia, once neat folds, were now thick, puffy petals, glistening with a slick that wasn’t just arousal—it was a continuous, slow ooze. They parted slightly without her volition, offering a glimpse of the flushed, gripping inner flesh, which pulsed with a slow, hungry rhythm.
Clare turned. Her eyes were wide, pupils blown. Not with love, not with desire as Evie had known it, but with a feral, biological imperative. She looked at Evie’s still-clothed form, her gaze locking onto the obvious, heavy bulge in Evie’s jeans.
“Take them off,” Clare said, her voice ragged.
“Clare, we need to… to talk. To understand what—”
“There’s nothing to understand!” Clare snapped, the words cracking. “I can feel it… inside. It’s empty. It’s aching. It wants what you have. So give it to me.” She crawled onto the bed, moving with a strange, predatory awkwardness. She got on her hands and knees, presenting herself. The position arched her back, making her altered sex even more prominent, a wet, dark flower begging for violation. “Fuck me. Fuck me properly this time.”
The words were a ice pick to Evie’s heart. ‘This time.’ A lifetime of insecurity, of fumbling, of quiet apologies after unsatisfying sex, crystallized in that phrase. The monster between her legs stirred, thickening, rising almost against her will. The sight of Clare like that, the smell of her, the raw need in her voice—it bypassed Evie’s terror and spoke directly to the new, primal thing she had become.
With trembling fingers, Evie unbuttoned her jeans. They fell, and her cock sprang free, fully erect, a thick, ruddy column of flesh that curved upwards. The veins stood out like cables. It looked alien, terrifying, and impossibly potent.
She approached the bed. The sight of Clare’s gaping entrance, glistening and pulsing, sent a shock of pure, undiluted lust through her. She positioned herself behind Clare, the head of her cock nudging against that slick, swollen opening. It was searingly hot, even through the wetness.
“Now,” Clare begged, pushing back against her. “God, Evie, now.”
Evie pushed.
The resistance was minimal. Clare’s body, transformed by the serum, yielded with a shocking, wet give. The swollen outer lips parted, and the head of Evie’s cock slid in, engulfed by a tight, rippling heat that was unlike anything she’d ever felt. It was a velvet vise, clenching and milking her already.
Clere screamed. It wasn’t a scream of pain, but of overwhelming, catastrophic sensation. Her back arched violently.
Evie groaned, a sound torn from deep in her gut. She pushed further, her hands gripping Clare’s hips. She watched, mesmerized and horrified, as inch after thick inch of her cock disappeared into Clare’s body. It was too much. Clare was taking all of her, the depth impossible, unthinkable.
She felt a barrier, a firm, rounded pressure at the very end of Clare’s channel. Her cervix. In some dim, rational part of her mind, Evie knew to stop. This was the limit. This was the boundary.
But Clare was screaming, “More! Deeper! I can feel it, I need it, please!”
And Evie’s body, this new, powerful engine of flesh, obeyed. She drove her hips forward in one final, brutal thrust.
The firm pressure yielded with a soft, wet pop.
Clare’s scream cut off into a choked, silent gasp. Her entire body seized, rigid. Evie was buried to the hilt, her cockhead penetrating the cervical opening, invading a space never meant for intrusion. The heat inside was otherworldly, a tight, clutching sphincter gripping the very tip of her.
For a second, they were frozen, a tableau of shocking violation.
Then Clare’s body erupted. A second, stronger orgasm ripped through her, this one silent, a seismic internal quake. Her cunt convulsed in rapid, fluttering spasms around the invading length, gushing fresh waves of fluid that dripped down Evie’s balls and onto the sheets below.
The sensation was too much. Evie’s control shattered. She pulled back until just the head remained caught in that impossible inner clasp, then slammed back in, past that tight ring again. Clare whimpered, a broken, continuous sound.
Evie fucked her. It wasn’t making love. It was a raw, piston-driven act of claiming and being claimed. The wet, slapping sounds of their flesh filled the room, punctuated by Clare’s choked sobs and Evie’s animal grunts. Each thrust bottomed out in that deep, forbidden place. Clare’s body, designed for this new hunger, took it all, milking her with relentless, internal pulses.
Evie came with a roar, slamming in one last time and holding there. Her orgasm was a torrent, a flood of release that felt like it was being pulled from her very spine. She pumped pulse after pulse of come deep into Clare’s womb, the hot jets triggering another, weaker series of convulsions in Clare’s exhausted body.
They collapsed, still joined, onto the soaked sheets. The room stank of sex and sweat and something faintly metallic. Evie’s cock, still semi-hard and trapped inside, twitched occasionally.
Clare was crying quietly, her face buried in the mattress. Evie, draped over her back, felt the sobs wrack through the body she was still impaling. The monstrous heat inside her was fading, leaving a cold, hollow horror.
She had done it. She had finally, truly fucked her girlfriend. She had given Clare exactly what she’d always wanted.
And as she lay there, buried in the devastating proof of it, Evie understood with perfect, chilling clarity that she had destroyed them both.
Evie’s softening flesh ached within Clare’s heat. She tried to pull away, to extricate herself from the ruin they’d made. A sickening shame filled her throat. But as she began to withdraw, the muscles inside Clare clenched, a slow, deliberate peristalsis that gripped her receding shaft.
It wasn’t a spasm. It was a command.
The faint, wet suction coaxed her limpness back towards fullness. Blood rushed back into the thick tissue, obeying a demand deeper than her will. Evie felt her cock swell, lengthen, re-hardening as it was actively drawn back into that impossibly deep, clenching warmth. A choked sound escaped her.
“Don’t you fucking stop,” Clare whispered into the mattress, her voice raw and ragged. Her hips pressed back, forcing Evie deeper again. “I’m not… I’m not finished.”
The internal pull intensified. Evie groaned as her hips stuttered forward of their own accord. She was a passenger in her own body. Her thrust was shallow at first, a hesitant slide in the slick mess.
“Harder,” Clare demanded, her fingers clawing at the bedding. “Fuck me like you mean it.”
Anger, bright and hot, flared through Evie’s despair. It was easier than the grief. She grabbed Clare’s hips, her fingers digging into the flesh, and snapped her own pelvis forward. The wet slap was brutal, final. Clare cried out, a sound of pure relief.
Evie set a punishing rhythm. Each inward stroke was met with that active, swallowing pull from Clare’s core, dragging her deeper. Each withdrawal was resisted by the clutching walls. The room dissolved into the sounds of their collision: skin on skin, labored grunts, the obscene, squelching protest of overstimulated flesh.
“Again,” Clare chanted, her words dissolving into moans. “Again, again, fuck, yes, there.”
Evie’s world narrowed to the points of contact: her hands on Clare’s hips, the burning stretch of her own engorged cock, the frantic, animal sounds Clare made. The intimate muscle inside Clare seemed to learn her, to twist and tighten in specific spots, wringing a building, unsustainable tension from her base. It was too efficient. It was merciless.
“I’m gonna…” Evie gasped, the warning torn from her.
“Do it,” Clare screamed, shoving back onto her. “Fill me up. I want to feel it.”
The climax wasn’t a peak; it was a detonation. Evie’s vision whited out as she slammed home and held, buried to the root. Her release was a violent, pumping flood that seemed to have no end, jetting into that deep, accepting vault. Clare’s body convulsed around her, a series of sharp, rhythmic flutters that milked her brutally dry.
This time, when Evie went soft, she wrenched herself free with a sickening, wet pop. She stumbled back off the bed, collapsing onto the floor. Her body was spent, trembling. She stared at the crumpled, soaked form of her girlfriend on the bed. Clare didn’t move. A slow, thick trickle of fluid began to seep from her onto the ruined sheets.
The silence that followed was heavier than any sound. Evie curled in on herself on the cold hardwood, the scent of their brutality thick in the air. Across the room, reflected in the dark mirror above the dresser, was a stranger, naked and shaking, covered in the proof of a terrible mistake.