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 12: Eyes Bigger Than Appetite

The apartment felt different when they returned. The familiar clutter—Evie’s graphic novels stacked precariously on the coffee table, Clare’s dry-cleaning draped over a chair—seemed like artifacts from a past life. The air, usually smelling of sandalwood candles and takeout, now carried the faint, medicinal scent of the lab on their clothes, and something else: a sharp, animal tension.

Evie moved like a stranger in her own body. The weight between her legs was a constant, pulsing presence. It hadn’t softened. It hung heavy and full, a thick, veined column of flesh that brushed against her inner thighs with every step. The stretch marks Sharma had noted were more pronounced now, a web of fine, angry red lines across the darkened skin. A dull, deep ache thrummed at the root of her, a reminder of violated anatomy.

She went straight to the bedroom, fumbling for a pair of Clare’s loose-fitting sweatpants. Even they strained against the bulge.

“Don’t,” Clare said from the doorway. Her voice was low, stripped of all its professional polish. She’d tossed her blazer on the floor. “Don’t cover it up.”

Evie froze, her fingers tangled in the drawstring. Clare’s eyes were fixed on her groin with a fervent, consuming focus. It was the same look she’d had in the lab, but distilled, purified by the privacy of their home.

“Clare, I… it hurts. A little. I think I need to lie down.”

“It’s supposed to be like this,” Clare said, stepping into the room. She began unbuttoning her cream silk blouse, her movements deliberate. “Sharma said there’d be an adjustment period. We have to… maintain circulation.” She let the blouse drop. Her breasts, freed from the lace of her bra, were high and full. Evie had always loved them, with a kind of wistful envy. Now, they just seemed like part of the landscape of a desire she could no longer navigate.

“I don’t think I can,” Evie whispered. “Not right now.”

“You don’t have to do anything,” Clare murmured, closing the distance. She pushed the sweatpants down Evie’s hips, letting the monstrous cock spring free. It bobbed, grotesquely large against Evie’s small frame. Clare’s breath hitched. “My god, Evie. Look at it.”

Evie didn’t want to look. She stared at Clare’s face instead, at the parted lips and dilated pupils. This was what she’d wanted, right? To be enough. To be more than enough.

Clare’s hand wrapped around the base. Her fingers couldn’t come close to meeting. She squeezed, a testing pressure. A fresh bolt of sensation shot through Evie—not quite pleasure, not quite pain, but a shocking, overloaded feedback. A bead of clear fluid welled from the tip.

“See?” Clare’s voice was thick. “Your body knows what it’s for.”

She pushed Evie backward onto the bed. The comforter was cool against Evie’s back. Clare climbed over her, straddling her hips but keeping her weight on her knees, avoiding direct contact. She leaned down, her blonde hair curtaining their faces, and kissed Evie. Evie tasted her own fear in it.

Then Clare straightened up, kneeling tall. She hooked her thumbs into the waistband of her skirt and tights, pushing them down in one rough motion. She was already wet, Evie saw. Soaked. The sight of Clare’s arousal, so immediate and visceral, sent a confusing jolt through her. Her cock twitched violently, slapping against her own stomach with a wet, heavy sound.

“I’ve wanted this,” Clare breathed, not touching herself, just letting Evie look. “I’ve fucking dreamed of being full. Of being ruined by you.”

Her hands came down to guide the head of Evie’s cock. The contact was electric. The sheer scale of it was absurd. The flared, purple crown was nearly as wide as Clare’s clenched fist.

“Easy,” Clare whispered, though the word seemed aimed at herself. She lowered her hips, letting the blunt tip press against her opening.

It wouldn’t go.

Clare grunted, bearing down. Her face flushed with effort. She rocked her hips, trying to smear the slickness, to force an entry. A sharp gasp escaped her. “Fuck. You’re so… wide.”

Evie lay paralyzed, watching the struggle. A part of her wanted to stop it, to shield Clare from this self-inflicted difficulty. Another part, dark and ashamed, swelled with a primal satisfaction. Look what I have. Look what I can do to you.

With a determined, desperate noise, Clare forced herself downward. The head began to stretch her, to distort her. Evie could see the impossible circumference of her own flesh disappearing into Clare’s body, a slow, relentless invasion. Clare’s eyes were squeezed shut, her lips pulled back from her teeth in a grimace that was half agony, half ecstasy.

“Oh god… oh fuck, Evie…” Clare panted. She managed another inch, her inner muscles fluttering wildly around the intruding mass. She was trembling, her thighs shaking with strain. “It’s… it’s so much. I can feel you… splitting me open.”

She paused, impaled just past the head, breathing ragged. A single tear traced down her cheek. She opened her eyes, and they were blazing. “Don’t you fucking move.”

“Don’t you fucking move.”

Evie obeyed. She was transfixed. The visual was obscenely beautiful and clinical at once. Clare’s body, straining to contain her, the skin of her entrance stretched taut and glistening around that impossible width. The look on her face was pure, unadulterated conquest. Her own tears hadn't been of pain, but of a need finally being met.

Clare began to move. It was a small, desperate grind at first. Each shallow dip of her hips forced another fraction of an inch inside. Her cunt was a searing, velvet clamp around the head of Evie’s cock. The drag was exquisite, a kind of pressure Evie’s newly sensitized nerves had never registered. A choked sound escaped her, part moan, part sob. Clare’s internal muscles spasmed, rippling against the intrusion in a frantic attempt to adapt.

“You feel that?” Clare gasped, her voice ragged. “You feel how fucking tight I am for you now?”

She bore down harder, her jaw clenched. A low cry tore from her throat, and she sank deeper. Her body was taking it. Inch after brutal inch disappeared inside her. The swell of Evie’s girth expanded her, remade her entrance. A thin trickle of lubrication mixed with something else, a darker, coppery scent hitting the air—the sign of capillaries surrendering to the pressure.

She kept going, her movements becoming a determined, punishing rhythm. The slap of flesh grew louder. Halfway. She’d taken nearly half the monstrous length when she suddenly jolted, a sharp gasp wrenching from her lungs. Her body went rigid. She’d reached the end of herself.

“Oh,” she whimpered, her eyes flying open, wide with a stunned realization. “Oh, right there. You’re… you’re at my fucking cervix.” She panted, a delirious smile touching her lips. Her whole lower body felt fused, impossibly full. “Right at the door. It’s… god, it’s perfect.”

Evie could hardly process it. The sheer, physical reality of being that deep inside another person was overwhelming. Clare’s vagina was a hot, vise-like sleeve that gripped every millimeter of her swollen cock with an intensity that bordered on violence. The stretching ache in her own groin was momentarily forgotten, drowned out by this new, all-consuming sensation of enclosure and heat. Her own hips gave an involuntary, shallow thrust upward, seeking more of that unbelievable pressure.

Clare moaned, a high, reedy sound. “Yeah. Fuck, do that again. Just… just a little. Don’t shove.”

Her hand, which had been braced on Evie’s stomach, snaked down between their bodies. Her fingers were slick from her own wetness as they sought out her clit. It was swollen, protruding from its hood, hypersensitive from the internal stretching.

Evie watched her. A familiar instinct, rusty but not forgotten, twitched in her. She reached down with her own hand, her smaller fingers gently brushing Clare’s aside. She took over. She focused all her attention on that tiny, hardened nub, applying a firm, circular pressure she knew from a thousand nights of gentle, familiar lovemaking.

The effect now was nuclear.

Clare screamed. A raw, unhinged sound that bounced off their bedroom walls. Her back arched sharply, her head thrown back. Her internal muscles, already stretched taut, convulsed in a brutal, rapid-fire series of clenches. It was an earthquake deep within her, a violent pulsing directly onto the head of Evie’s cock.

The sensation of that muscular seizure, of Clare’s deepest tissue gripping and milking her, was a direct wire to Evie’s spine. There was no stopping it. Her own climax roared up from that pulsing root, bypassing all thought.

A purely dry, internal orgasm seized her, just like in the lab, but a thousand times more intense. Her whole pelvis locked. Her cock, already impossibly large, gave a series of savage, jerking twitches inside Clare’s vise-like channel, as if it were trying to swell even larger against the rhythmic contractions that gripped it.

For several seconds, Clare remained rigid, suspended in her climax, her body a perfect, shuddering bow. Then she collapsed forward, her full weight pressing down onto Evie. She was still spasming inside, little aftershocks fluttering around the massive, implanted flesh.

She was still spasming inside, little aftershocks fluttering around the massive, implanted flesh. Their shared breath was the only sound in the room, a ragged symphony against the muted city hum. Clare’s weight was a warm, damp anchor, pinning Evie to the bed, to the reality of what she had become.

Clare finally stirred, lifting her head from Evie’s shoulder. Her makeup was smeared, her expression sated and utterly wrecked. “Christ,” she exhaled, the word puffing against Evie’s skin. She pushed herself up on trembling arms, her body rising, and Evie felt the agonizing, exquisite shift as she began to withdraw.

It was a slow, wet, impossible unspooling. Evie watched, mesmerized and horrified, as her own grotesquely engorged cock, slick with Clare’s fluids and a trace of coppery pink, emerged inch by stretched inch from Clare’s body. The sight was obscenely clinical. Clare’s entrance remained gaped, swollen, a flushed and open o that pulsed weakly. It did not look like it would ever close properly again.

“Fuck me,” Clare whispered, not to Evie but to the air, a prayer of astonishment. She finally lifted off completely, settling back on her heels between Evie’s spread legs. She stared at Evie’s cock, which stood fully erect, untouched, as thick and rigid as it had been inside her. A glistening string of connection stretched between them for a second before snapping.

“It’s… bigger.” Clare’s voice was hollow with awe. She reached out a hand, her fingers not quite touching the slick, veined surface. “I swear it’s bigger than it was in the lab. Can you feel that? Can you feel it still… growing?”

Evie could. A deep, cellular throbbing persisted, a low-grade hum of unnatural expansion. The web of angry red lines seemed darker against the purple-tinged skin. She didn’t answer. She was trapped inside the satellite view of her own body, disconnected.

Clare leaned forward, her long blonde hair trailing through the mess on Evie’s stomach. She didn’t kiss. She extended her tongue, flat and deliberate, and licked a broad, slow stripe up the underside of Evie’s shaft. She collected their mixed wetness—her own arousal, Evie’s clear seepage—with a focused hunger. She savored it, her eyes closed, a low hum in her throat.

“Taste yourself,” Clare murmured, her lips brushing the heated skin. “Taste what you did to me.” She took the swollen head into her mouth, not to suck, but to clean it, her tongue swirling around the corona with a devoted precision. Every nerve in Evie’s cock screamed, oversensitive and raw.

Then Clare sat up, her eyes blazing with a new idea. She pushed her large breasts together with both hands, creating a soft, pale valley of cleavage. She guided Evie’s cock into that warm space, the tip pressing against the base of her throat. The contrast was absurd—the brutal, dark mass of flesh nestled between pliant, yielding skin.

“Let’s try,” she said, her voice husky. She squeezed her tits around the shaft and attempted a feeble, upward motion. The mechanics were all wrong. The cock was too large, too unyielding; it barely moved within the constrained space. Her breasts slid over the same few inches of veined surface, a pathetic, frustrating imitation of the act.

A sharp, ragged laugh escaped Evie. It was tinged with hysteria. “It doesn’t fit, Clare.” The words were brittle. “Nothing fucking fits anymore.”

Clare stopped, her chest heaving. She looked down at the monstrous member trapped between her breasts, then up at Evie’s tear-streaked face. The frantic lust in her eyes softened, just for a second, into something like recognition. Into seeing Evie again, not just the cock.

“It fits inside me,” Clare said, her tone defiant, almost pleading. She released her breasts and wrapped her hand around the base again, her grip possessive. “It fits perfect. I felt it. I’ve never felt so full in my life.” She leaned over Evie, her expression fierce. “Now fuck me with it again. I want to feel it all over. I want to get used to it.”

The demand hung in the air, a challenge. The momentum of the thing—the injection, the change, this ravenous new hunger between them—had its own gravity. Evie, adrift and aching, felt herself pulled toward its center. She gave a single, shallow nod.

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