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 37: Aftermath

The silence was a living thing, thick and syrupy, broken only by the wet, peeling sound of separation. Clare was trembling, every muscle in her thighs and abdomen quivering with spent effort as she began to withdraw. It was a slow, slick unveiling.

Evie watched, propped on one elbow, her own body humming with a deep, satiated fatigue. She watched the place where Clare and Sophie were joined, expecting to see the familiar, though astonishing, length of flesh she’d witnessed sink inside. But what emerged was different.

It wasn’t just thick. It was substantial. A column of flushed, veined flesh that seemed to defy the anatomy it came from. As more of it slid free from Sophie’s impossibly accommodating body, Evie’s mind stuttered, trying to reconcile memory with reality.

“Holy fuck,” Evie breathed, the words leaving her in a rush of air.

Clare froze, two thick feet of her own flesh still sheathed inside Sophie. She looked down, her sweat-damp hair falling around her face. Her eyes, wide and glassy, tracked the path from her own body to Sophie’s. She saw it. The girth. It was nearly as thick as Evie’s cock, a fact that sent a jolt of something like competitive heat through Evie’s gut. But the length… Jesus Christ, the length.

It kept coming. Sophie made a soft, gutted sound as another inch withdrew, her body clenching weakly around the retreating monolith. Clare’s hands, braced on Sophie’s hips, were white-knuckled. She wasn’t pulling anymore. She was just… letting it slide out on its own, a slow-motion miracle of grotesque biology.

When the final, bulbous tip finally popped free with a soft, wet pluck, it lay against Sophie’s thigh, a shocking sight. It was massive. Thick as Evie’s wrist and, as Evie’s brain finally calculated, easily more than thirty inches long. It rested, heavy and semi-turgid, glistening with Sophie’s fluids. The bedroom lamp caught the sheen on its surface, highlighting a network of throbbing blue veins.

Sophie’s body gave a full-body twitch, her own hole gaping, winking slowly, profoundly empty. A slow trickle of fluid seeped onto the sheet beneath her. She was unconscious, or close to it, a faint smile still on her lips.

Clare simply stared at the thing between her legs. It was hers. It had come from her. She reached a trembling hand down, not to touch it, but as if to verify its connection to her body. Her fingers hovered an inch above the heated flesh. “This… isn’t possible,” she whispered. Her voice was shredded, unrecognizable. “It was… it was big before. But not like this. It grew.”

“While it was inside her,” Evie said, pushing herself up. She moved closer, her own massive cock, now softening, brushing against Clare’s thigh. She looked from the monstrous length to Sophie’s wrecked, petite form. “She took… Clare, she took more of that than I’ve got. How is she not split in half?”

Clare shook her head slowly, a machine glitching. “I don’t know.” Her lawyer’s mind was scrambling for precedent, for a rule, a statute of anatomy, and finding nothing. “It felt like… when I came. It wasn’t just a climax. It was like a command. A need to expand. To fill her up completely.” She finally looked at Evie, her blue eyes wide with a terror that was almost childlike. “It obeyed.”

The word hung in the air. Obeyed. This wasn’t just a random mutation. It was responsive. It was willful.

Before Evie could process it, Sophie stirred. A low moan vibrated in her throat. Her eyelids fluttered open. Her gaze, foggy and unfocused, landed on Clare’s face, then drifted down. Instead of fear or shock, her expression melted into a look of pure, drugged adoration. “Clare,” she slurred. Her hand, weak and shaky, reached down. Her fingers wrapped around the base of Clare’s cock, not even closing halfway around its circumference. “It’s a fucking masterpiece.”

Clare flinched at the touch, a jolt of sensation traveling up her spine. The flesh in Sophie’s grip twitched, thickening perceptibly.

“Don’t,” Clare whispered, but it was a plea without conviction.

“It’s still hard,” Sophie murmured, her thumb stroking a prominent vein. She turned her head, her eyes finding Evie. There was a challenge in them, a sly, knowing spark amidst the exhaustion. “Your girl is a fucking goddess, Evie. You know that, right? She made this. She can make it do things.” Sophie’s other hand crept between her own legs, fingers sliding through the slick mess. She pressed two fingers inside her own gaping entrance and groaned. “I’m so empty. It feels like a canyon in me. I need it back.”

“Sophie, you can’t,” Evie started, but the protest was mechanical. She was watching Clare’s face. Watching the terror be slowly replaced by a dawning, hungry curiosity. The power she’d felt, the control she’d surrendered, was calling her back.

“Why not?” Sophie breathed, pushing herself up on her elbows. She looked utterly debauched, her red hair a wild tangle, her small body marked and used. “It wants to. Feel it.” She tightened her grip, and Clare gasped, her hips jerking forward minutely. “It’s getting harder for me. Isn’t it, Clare?”

Clare’s jaw was tight. She gave the tiniest, agonized nod. “It… responds. To attention.”

“Then give it attention,” Sophie said, her voice dropping to a coaxing whisper. “Fuck me with it again. I’m not broken. Look at me.” She spread her legs wider, offering herself. The sight was profoundly lewd, an open invitation to an impossibility. “I want to feel it get big inside me again. I want you to come in me so deep I taste it.”

That did it. The graphic filth of the request shattered Clare’s remaining hesitation. A low groan escaped her, and the massive cock in Sophie’s hand gave a definitive jerk, fully re-engorging, rising to its full, intimidating length and girth.

A low groan escaped her, and the massive cock in Sophie’s hand gave a definitive jerk, fully re-engorging, rising to its full, intimidating length and girth.

“See?” Sophie whispered, her voice husky with want. She didn’t ask. She demanded. “It knows what it needs. And I need it.” Her eyes, bright and reckless, locked onto Clare’s. “Don’t you fucking stop this time. Don’t think. Just fuck me. More. I want more.”

Clare’s breath hitched. The command cut through her daze. Her fingers, previously hovering, now clenched into the sheets. The weight between her legs was a palpable demand, a thrumming focus of alien sensation. It felt separate from her, yet every pulse echoed directly into her core. She looked at Evie, a silent question in the glance.

Evie felt it too—the shift. This wasn’t about her insecurities anymore, or even about claiming Clare. This was about witnessing. About feeding the hunger they’d unleashed. She gave a slight, sharp nod. “Give it to her.”

That was all the permission Clare needed. The last thread of her civilized self snapped. With a movement that was all instinct, she rolled Sophie onto her stomach. “On your knees,” Clare muttered, her voice raw. “Now.”

Sophie scrambled, a eager desperation in her limbs. She got her knees under her, presenting herself from behind. The sight was brutally open: her small body, the red welts from Evie’s earlier grip on her hips, the slick, dark pink of her stretched entrance still glistening and loose. Clare moved behind her, her own movements predatory now. She guided the bulbous, dripping head of her cock to Sophie’s hole. It nudged against the softened ring of muscle, which yielded without protest, hungry and eager.

Clare didn’t push slowly. She slammed forward.

Sophie screamed, a sound of pure, shocking fulfillment as the immense thickness forced its way inside her in one relentless, brutal stroke. Her back arched, her fingers tearing at the comforter. “FUCK! Yes! Oh god, it’s so much bigger!” Her voice was shredded, guttural.

It was. Evie watched, mesmerized and heated, as Clare’s cock—already thicker than before—buried itself to the hilt inside Sophie’s compact frame. There was no gentle accommodation this time. This was a claiming. Sophie’s belly distended noticeably, a firm ridge pushing out the soft skin. Clare leaned over her, bracing one hand next to Sophie’s head, her blonde hair falling around them like a curtain. She didn’t move at first, just let Sophie feel the full, impossible stretch.

“You wanted more,” Clare growled into Sophie’s ear. “You feel that? That’s all me. That’s what I’m packing now.” She pulled back, a slow, torturous withdrawal that made Sophie whimper, and then hammered back in. The wet slap of flesh was obscenely loud in the still room.

Sophie’s cries became a rhythmic chant. “More! Harder! Don’t you fucking hold back on me, Clare!” Each word was punched out of her by a driving thrust. Clare obliged, her hips pistoning with a savage, mechanical rhythm. Sweat dripped from her chin onto Sophie’s back. The bed skidded across the floorboards with each impact.

Evie’s own arousal was a live wire. She moved behind Clare, drawn to the powerful flex of her girlfriend’s back, to the sight of her utterly lost in this ferocious act. Evie’s cock, hard and aching again, pressed against the cleft of Clare’s ass. Clare gasped, her rhythm faltering for a second. “Evie…”

“You heard her,” Evie murmured, her hand sliding around Clare’s slick stomach, feeling the muscles tighten with each thrust into Sophie. “She wants more.” Evie spat on her own hand, slicking her length, and guided herself to Clare’s other entrance. She pushed against the tight, resisting pucker. Clare was already so full, so stretched from the front, but Evie was relentless. She applied steady pressure, her other hand gripping Clare’s hip bone.

With a choked, broken sound, Clare yielded. The head of Evie’s cock popped past the tight ring of muscle, and they both groaned at the searing, tight heat. Clare’s body clamped around her, a vise grip from behind while Sophie’s body milked her from the front. Clare was impaled, penetrated, the fulcrum of a savage triangle.

“Oh, Jesus Christ,” Clare sobbed, her hips stuttering. The dual penetration was overwhelming, a sensory flood that short-circuited thought. She was a conduit, a vessel being used and filled.

Evie began to move, a slow, deep counter-rhythm to Clare’s frantic fucking of Sophie. Each time Clare drove forward into Sophie, Evie pulled back. Each time Clare withdrew, Evie plunged deeper into her ass. They found a brutal, punishing syncopation. Sophie was screaming now, incoherent, her face mashed into the pillow, her body taking a punishment it was engineered by the drug, by Clare’s will, to crave.

“You’re so deep,” Sophie babbled, her words slurred by the fabric. “I can feel it in my fucking throat! Give me your come! Fill me up, Clare! I want to feel you pump it so deep I choke on it!”

The filthy demand triggered something in Clare. A tremor ran through her, starting in the root of her monstrous cock and erupting through her entire body. Her thrusts became erratic, animalistic. Her control was gone, obliterated by the double stimulation. “Gonna… gonna…” was all she could manage.

Evie felt it too. The tight clench of Clare’s body around her, the desperate, rhythmic spasms that signaled a climax building from a place deeper than any orgasm she’d ever known. She dug her fingers into Clare’s hips, her own pace becoming frantic, slamming into her with a force that rocked all three of them. “Do it. Let it go. Give her what she wants.”

Clare’s cry was a raw, torn thing. She shoved herself as deep as she could into Sophie, her body locking into a rigid arch. Inside Sophie, her cock pulsed, a powerful, swelling throb that grew even thicker, stretching Sophie to a breathtaking limit. Then it erupted.

It wasn’t a normal release. It was a flood. A geyser of thick, hot seed that poured into Sophie’s depths with impossible pressure. Sophie’s shriek was muffled, her body convulsing violently, her own orgasm ripped from her by the feeling of being filled beyond capacity. Clare kept coming, pulse after pulse, her body jerking with each one, while Evie, driven over the edge by the convulsions around her cock, followed with a guttural roar, pouring her own release deep into Clare’s ass.

The chain of climaxes seemed endless. When it finally subsided, Clare collapsed forward onto Sophie’s back, spent and shuddering. Evie fell beside them, pulling out with a wet sound. They lay in a heap of slick limbs and ragged breath.

Sophie was the first to speak, her voice a dreamy, satisfied murmur into the mattress. “More,” she sighed, a soft, smiling command. Then her eyes closed, and she passed out.

Clare lay still, her face hidden. Her cock, still partially hardened and slick with spent fluids, lay heavily against Sophie’s thigh. It was, Evie saw with a dull shock, even thicker than before.

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