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 25: The Measuring Contest

The key turned in the lock with a definitive click, too loud in the quiet hallway. Clare pushed the door open, her briefcase heavy in her hand, the scent of rain and cold city air clinging to her coat. The apartment was dim, lit only by the cheap floor lamp in the living room. The stale smell of burnt popcorn from last night’s abandoned attempt at normality lingered.Then she heard it.

A high, broken cry. It came from their bedroom. Not a cry of pain, but of overwhelmed sensation. It was followed by a low, guttural groan she recognized, a sound that vibrated in her own memory. Her body tightened, a flash of ice and fire in her veins.

She didn’t call out. She moved silently, dropping her briefcase by the door, her heels making soft thuds on the hardwood before she stepped out of them. The bedroom door was ajar, just as she’d left it that morning. The warped frame let a slash of yellow light fall across the hallway floor.

Clare stood in the shadow just outside, and looked.

The scene was so stark it felt staged. Evie was on her back, propped against the headboard, her face a rictus of agonized pleasure. Her glasses were crooked. Her hands were tangled in a mane of fiery red hair.

Sophie.

Sophie was on top of her, riding her, her petite body a pale, frantic piston in the lamplight. She was naked, her skin sheened with sweat, her small breasts bouncing with each deep, driving drop of her hips. Her head was thrown back, her mouth a perfect ‘O’ from which those sharp, sweet cries escaped.

But it was the joining of them that froze Clare’s blood and sent a bolt of pure, shameful lightning to her core.

Sophie was taking all of it. Easily.

Every impossible, monstrous inch. Clare could see it. The thick, veined shaft disappeared utterly into Sophie’s small body, buried to the hilt with a wet, fleshy sound that punctuated every movement. There was no proud, unconquered inches left gleaming in the light. Evie’s hips met the curve of Sophie’s ass with a soft, full smack each time she bottomed out.

“Fuck… Evie, fuck, it’s so deep,” Sophie moaned, her voice slurred, drugged with pleasure. She rolled her hips in a tight circle, grinding against Evie’s pubic bone. “Don’t stop. Don’t you fucking stop.”

Evie’s hands gripped Sophie’s hips, her fingers digging into the pale flesh. She was crying, silent tears cutting tracks through the sweat on her temples. She was witnessing her own body used as a tool of absolute conquest, and the validation, the sheer carnal proof of it, was breaking her apart.

Clare’s own breath was shallow. The jealous fury was a acidic wash in her stomach, cold and sharp. But beneath it, hot and insistent, a predatory arousal awoke. Her hand moved to the front of her tailored trousers. The fabric was already damp. She unbuttoned them, slid her hand inside her underwear. She was soaking wet.

She pushed the door open.

The sound of the door swinging wider made them freeze. Sophie’s head snapped around, her eyes wide, her movements halting mid-stroke. Evie looked over, and the guilt and panic that flooded her face was like a physical blow.

“Clare—” Evie choked out.

Clare held up a hand, silencing her. Her face was a calm, deadly mask. Her eyes, however, burned. She walked into the room, her movements slow, deliberate. She didn’t look at Evie. She kept her gaze locked on Sophie, on the place where their bodies were joined.

“Don’t stop on my account,” Clare said, her voice a low, controlled rasp. She stopped at the foot of the bed. “In fact, show me.”

Sophie stared, frozen, a deer in headlights. Then a sly, defiant smile touched her kiss-swollen lips. She began to move again, a slow, deliberate rise and fall, her eyes locked on Clare’s. “Like this?” she breathed, a challenge.

“Yes.” Clare’s hand moved under her blouse, cupping her own breast through her bra, her thumb circling a hard nipple. Her other hand remained buried in her trousers, fingers working in slow, firm circles. “Show me how you take every inch of my girlfriend’s massive cock. Show me how a greedy little slut like you fits it all.”

The obscenity, spoken in Clare’s cool, courtroom tone, seemed to electrify the room. Sophie’s smile turned feral. She braced her hands on Evie’s chest and began to ride in earnest, her pace turning punishing, her small body slamming down again and again, taking Evie to the root with a wet, slapping rhythm.

“You see?” Sophie gasped, her voice pitching higher with each thrust. “You see how deep it goes? I can take all of it. All of it, Clare. She’s so fucking deep inside me.”

Clare watched, her own fingers moving faster. She saw the way Evie’s body arched, the way her toes curled, the way her eyes rolled back as Sophie milked her. She saw the proof she’d failed to achieve herself, presented with triumphant, carnal glory. The jealousy morphed, twisted into something darker and more collaborative.

“You like that, don’t you?” Clare said, her voice hitting Evie now. “You like how she fucking devours you? How her tight little cunt sucks you in like you belong to her?”

Evie could only nod, a strangled sound escaping her.

Clare moved then. She stripped off her blouse and bra, let her trousers and underwear fall to the floor. She climbed onto the bed, her body a long, confident line in the dim light. She didn’t touch them. Instead, she positioned herself beside Evie’s head, kneeling over her. The scent of her own arousal, musky and strong, filled the space between them.

“Look at her,” Clare commanded Evie, grabbing a fistful of her pink hair and forcing her head to turn, to watch Sophie’s frenzied ride. “Look at that slut take what I couldn’t. And you’re going to make me come while you watch.”

Clare lowered herself onto Evie’s face. Evie’s tongue met her without hesitation, a hungry, desperate laving. Clare rocked against her mouth, her eyes locked on the spectacle before her. The dual sensations—Evie’s tongue working her clit, and the visual of Sophie impaled on Evie’s cock—drove her higher, faster.

“I’m gonna come,” Sophie shrieked, her rhythm becoming erratic, chaotic. “Oh god, Evie, I’m gonna—!”

“Do it,” Clare growled, grinding down on Evie’s face. “Come all over her fucking cock. Let her feel you.”

Sophie’s body went rigid. A raw, shattered scream tore from her throat as her orgasm hit, her internal muscles clamping down in visible waves around the buried length. The convulsions tipped Evie over the edge. With a choked roar, Evie came, her hips bucking off the bed, pumping her release deep into Sophie’s shuddering body.

The sight, the sounds, the taste of Clare on her tongue—it was too much. Clare’s own orgasm ripped through her, silent and fierce, a tight, shuddering release that left her trembling. She collapsed onto her side, breathing heavily.

For a long moment, the only sounds were ragged breaths and the wet, slow sound of separation as Sophie, spent and trembling, lifted herself off of Evie with a soft, oversensitive gasp.

For a long moment, the only sounds were ragged breaths and the wet, slow sound of separation as Sophie, spent and trembling, lifted herself off of Evie with a soft, oversensitive gasp.

Clare watched, her own body still humming from her orgasm. Her eyes, heavy-lidded and satisfied a second before, now sharpened into focus. They followed the retreating flesh, the slick, glistening length emerging from Sophie’s swollen, well-used opening.

What was revealed stole the air from Clare’s lungs.

It was enormous. The morning’s measurement, the extra inch she’d struggled against, felt like a distant memory. This was different altogether—noticeably thicker, at least a few inches longer, a vein-threaded pillar of flesh that seemed to pulse with its own latent heat. Pre-come and Sophie’s arousal sheened its entire length, making it glow in the low light.

Her own painful, victorious struggle from a few hours ago felt pathetic. A farce. Sophie had taken this—this thing—with a screaming, welcoming ease Clare could never mimic. A cold knot of something vicious tightened in her gut.

It was jealousy, bright and acid-green. But beneath it, a darker, wetter heat bloomed. Her cunt, already slick from her own climax, gave a fresh, aching throb.

“Jesus fucking Christ,” Clare breathed, the words barely audible.

Sophie heard her. She shifted back on her heels, wincing slightly, a smug, shattered smile on her face. She looked from Clare’s stunned expression to Evie’s still-hard cock, which lay against Evie’s stomach like a accusation. “I know, right?” Sophie said, her voice hoarse. “It’s a fucking beast.”

Evie simply stared at the ceiling, tears drying on her temples, looking utterly conquered.

Clare’s hand moved. She didn’t command it. It slid between her own thighs, through the wet mess there, her fingers finding her clit again. The direct touch was a bolt of sensation. She watched her own fingertips, glistening, circle the swollen nub. She couldn’t look away from Evie’s cock.

“You took it all,” Clare stated, her voice flat.

“Every last inch,” Sophie confirmed, a proud defiance in her exhaustion. She reached out and wrapped her fingers around the base, giving it a slow, possessive stroke. Evie flinched, a fresh bead of come welling at the tip. “It just… fits. Like it was made for me.”

That was the cut. Clean and deep. Clare’s circling fingers pressed harder. Her arousal was a thick, shameful tide now, drowning the jealousy, fueling it. She imagined that stretch, that impossible fullness Sophie described with such casual ownership. Her own body clenched around nothing, a hollow, wanting ache.

“Show me again,” Clare heard herself say.

Sophie’s eyebrows lifted. Evie turned her head on the pillow, her eyes wide.

“What?” Evie whispered.

“You heard me.” Clare’s voice gained strength, a dominant edge she used in negotiations. She kept her fingers moving on herself, a blatant, rhythmic display. “You took it so easily. Do it again. I want to watch you swallow that whole fucking thing.”

Sophie’s smile returned, wicked and understanding. She loved an audience. “Your girlfriend’s a voyeur, Evie,” she purred, shifting her position. She didn’t need lube; she was dripping, stretched open and ready. She positioned the broad, slick head at her entrance.

Clare leaned forward, her breath catching. She watched the initial resistance, the parting of Sophie’s flesh. Then, with a slow, deliberate roll of her hips, Sophie began to sink down. It was not the agonizing battle Clare had fought. It was a smooth, practiced descent. A homecoming.

“Oh fuck, yeah,” Sophie moaned, her head falling back as she took the first thick third. Her body accepted it with a wet, succulent sound. She paused, savored it, her eyes on Clare. “See how it opens me up? Like I was fucking built for it.”

Clare’s fingers worked faster, a frantic counterpart to Sophie’s slow impalement. She was mesmerized by the obscene progress, the way Sophie’s petite body distended to accommodate the girth. Inch by obscene inch, Evie disappeared into her.

“All the way,” Clare commanded, her voice tight. “I want to see your pretty little cunt lips kissing her skin.”

Sophie obeyed. She dropped the final few inches in one smooth, breathtaking motion, her ass meeting Evie’s thighs with a soft slap. She was fully, completely speared. Clare could see the faint, terrible outline of the shape inside Sophie’s belly.

“Fuck,” Clare gasped, her own orgasm rising, swift and brutal. It was fueled by envy, by arousal, by a deep, terrible fascination.

Sophie began to move, a slow, deep grind. “It’s so deep,” she chanted, “so fucking deep inside me. You feel that, Evie? You’re in my guts.”

Evie’s hands flew to Sophie’s hips, her knuckles white. She was crying again, silently, overwhelmed by the physical proof of her own transformation and the wreckage of her relationship laid bare beside her.

Clare came with a sharp, silent shudder, her body bowing, her fingers soaked. She watched, breathless, as Sophie rode out her own second peak, as Evie finally spilled into her with a broken sob.

This time, as Sophie lifted off, Clare’s eyes were not on the glorified, shocking cock. They were on Evie’s shattered face. And on Sophie’s victorious one. The silence that fell was no longer sated. It was loaded, fractured, and cold. The space between Clare and Evie on the rumpled bed felt like a canyon.

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