Swapped Genitals and Full Transformation

Otto woke to gray morning light and a slick, unfamiliar heat pooled between his thighs. He was thirty-two, an accountant, and the apartment felt wrong in a way no quiet Saturday should. Beside him Gwen stirred under the rumpled sheet. She was twenty-nine, a marketing manager who kept her dark hair in a loose knot even in sleep, and she made a broken sound when her palm drifted down her stomach and met something that had not been there when they fell asleep.

"Otto," she said. "Look."

The sheet fell from her hips. Between her smooth thighs, where he had kissed her the night before until she shook and came against his mouth, lay his cock. Thick. Familiar. Already half-heavy, the full warm weight of his balls hanging beneath it. His cock. On his wife.

His own hand went between his legs and found nothing of himself. Soft folds. A clit that jumped under his fingertip. Dark, coarse hair, not the neat trim Gwen kept. The lips were fuller, the skin a warmer brown than Gwen's pale gold, and the slickness that welled up carried the faint citrus of a lotion he had not smelled in years. Sonia. His ex-girlfriend. Hispanic, olive-skinned, the woman he had broken up with four years ago, when he was twenty-eight and she was thirty-one, long before Gwen. The last person, before his wife, that he had made orgasm.

The broadcasts the night before had been a frantic jumble. An unexplained event. Global. No one could name a cause. Every adult had swapped genitals with the last person they brought to orgasm. Gwen had come on his tongue. He had come inside her after. By that rule she should have his cock, and he should have hers.

He did not have hers.

"It's not mine," Gwen whispered, staring at the shaft against her belly. Her voice shook, but her hips had already tilted, offering the heavy length to the cool air as if her body had decided first. "That's you. That's your cock, Otto. What do you have?"

Memory hit him in a hot, forbidden rush: Sonia laughing in his old apartment, thighs tight around his ears, shuddering as she soaked his fingers the last night they were together. Buried on purpose. Now living between his legs, wet and aching, as if it had waited years to be touched again.

His libido detonated. Heat poured through his gut. The new cunt clenched on nothing and drooled onto the sheet. Between Gwen's thighs the borrowed cock jerked, thickening, the head flushing a deep hungry color.

"I have Sonia's," he said, hoarse. "My ex. I can tell by the hair, the color, the smell. God, Gwen. I can feel her."

Tension crackled between them, married and suddenly wearing the proof of a woman he had sworn he was done remembering, while his own manhood throbbed on his wife's body and both libidos screamed to be used.

They could not stop staring. Gwen's gaze dragged down his torso and stuck between his spread thighs, where Sonia's pussy glistened, dark hair already matted, the inner lips swollen and shining in the gray light. Otto could not look away from the cock on his wife. It rose as he watched, lifting off her soft belly, veins standing along the shaft he had lived inside for years, the head wet and dark. His borrowed cunt answered with a throb so sharp he whimpered.

"You're hard," he said.

"You're dripping down your ass," she said, and the crude honesty of it made his clit jump. Her voice had gone low, rough at the edges. She wrapped her fingers around the stolen shaft and stroked, slow, from the heavy root to the leaking tip, and her eyes fluttered shut at the sensation rolling up a cock she had never owned until this morning. "Fuck. I can feel every ridge. It's mine right now, and it wants you. It wants that."

She nodded at the slick mess between his legs. Otto's face burned. The memories would not stay buried. Sonia used to sprawl just like this on his old mattress, begging him to look at how wet she was, telling him she needed to be filled until she couldn't think. Now he was the one empty. Now he was the one whose hips rolled, chasing a touch that was not there yet.

Gwen stroked again, thumb smearing precum over the crown, and watched his face while she did it. "You keep clenching," she murmured. "I can see it. That little hole keeps fluttering like it knows what's coming. Does it feel like her? When you touch it?"

He slid two fingers through the dark hair and over the swollen clit, and the jolt bowed his back off the mattress. Wetness coated his knuckles instantly, thicker and hotter than anything Gwen's body had ever given him. "Yes," he gasped. "It's hers. It remembers being fucked. Gwen, I can't—I don't want to fight it."

"Then don't." She crawled closer, cock bobbing, heavy balls swaying, and dragged the wet head along his inner thigh without pushing in. The tease was deliberate. Mean in the sweetest way. "Tell me what you want. Out loud. I want to hear my husband beg for a cock."

His pride lasted one more heartbeat. Then the ache won.

"I want it inside me," he said. "I want you to put that cock in Sonia's cunt. I need to feel what she felt when I made her come. I'm asking. I want it. Please, Gwen. Fuck me with it."

Her stroke stuttered. A fresh bead of precum welled at the slit and dripped onto his thigh. She searched his face, and whatever she found there—want, not doubt—made her breath catch hard.

"You sure?" she asked. "Because if I start, I don't think this thing will let me stop. It's screaming at me to bury itself in you."

"I'm sure." He caught her wrist, not to halt her, but to pull her up the bed. "I want you inside me. Right now. Both of us. Willing. On our bed."

She let go of the shaft long enough to shove the sheet to the floor. They climbed onto the mattress together, knees denting the same place they had made love the night before, except nothing about their bodies matched that night anymore.

Gwen pushed him onto his back and followed him down, one hand braced by his head, the other guiding the thick cock she had stolen from his body. Otto hooked his knees up, open, shaking, and she pressed the broad head to the slick entrance of Sonia's cunt. They looked at each other. He nodded. She pushed.

The stretch stole his breath. Inch by slow inch she sank into him, the shaft he had jerked in this same bed for years now opening a pussy that had once belonged to the woman before his wife. Wet heat gripped her. She groaned like the sound had been punched out of her lungs and did not stop until her balls rested against his ass and the head nudged something deep that made his vision spark white.

"Fuck," she hissed. "You're so tight. She's so tight. Otto—"

"Move," he begged. "Please move. I can feel all of you."

She drew back and slid home again, missionary, deep and filthy, the wet sound of it obscene in the quiet apartment. Otto's hands found her waist—still narrow, still Gwen's waist—and he pulled her in harder, rocking up to meet every thrust.

"You love it," she said against his lips, fucking him steady, balls slapping softly. "My husband, taking cock like he was made for it. This pussy was waiting for me."

"Harder," he said. "I want to feel it tomorrow. I want you to ruin me."

She gave it to him. The pace turned meaner, deeper, the head punching that sweet spot until his toes curled and his cunt fluttered wildly around her. He came the first time without warning, a sharp, rolling orgasm that clamped down on her cock and tore a shout out of his throat, his hips jerking, more wetness flooding out around the shaft.

Gwen did not stop. She pulled out while he was still shaking, flipped him onto his stomach, and hauled his hips up into doggy style before he could catch his breath. The new angle let her see everything: the dark-haired pussy gaping, shiny, begging. She slammed back in and the slap of her hips against his ass filled the room.

"There," she growled, pounding harder. "Take it. Take every inch."

Otto moaned and rocked back to meet her, greedy, face in the pillow, one hand snaking under himself to rub the swollen clit while she fucked him. The second orgasm built faster than the first. And something else built with it.

Heat that was not pleasure crawled over Gwen's skin. Her shoulders popped, broadening under his gripping hands—no, under her own shifting frame. The waist he had been holding thickened. Muscle rolled onto her arms, her back, her thighs. Her breasts, small and soft against his spine when she leaned over him, drew inward and vanished, chest flattening into the hard plane he saw in the mirror every morning. Her jaw squared. Her voice dropped an octave mid-groan, becoming his voice, the one he used when he was close.

"Otto," she rasped, except it was his mouth shaping a name that no longer fit, and the cock driving into him swelled thicker, heavier, exactly the size it had been when it still belonged to him, seated now in a body that was becoming his in every other way too. "Something's—fuck—I'm changing."

"Don't stop," he gasped, because the same fire was eating him from the hips outward and it felt too good to refuse. "Don't you dare stop."

His limbs shrank. He felt it in the way his reach for the headboard came up short, in the way his wrists narrowed, in the high, shocked sound of his own moan climbing into a register he had never owned. His hips widened under her pounding, ass rounding, plush and full, until her grip had to adjust for curves that had not been there a minute ago. Weight gathered in his chest. Breasts swelled against the mattress, heavy, sensitive, nipples dragging the sheet every time she drove him forward. His skin darkened under the sweat, pale gold warming to olive, the color he remembered on Sonia's shoulders when she lay in Sunday light. His hair, short and ordinary, spilled longer against his neck, thick and dark. His face—he could not see it, but his lips felt fuller, his cheekbones shifting, and when he cried out it was a woman's voice, rich and wrecked, the voice that used to beg him from this same position years ago.

Gwen was gone. What knelt behind him, fucking him through the change, was an exact copy of the man he had been yesterday: broad shoulders, accountant's soft-solid build, the same hands, the same cock, the same low grunt he made when he was about to lose it. And he was no longer Otto. He was Sonia. Curvy, olive-skinned, breasts swaying, hips wide, the precise duplicate of the ex-girlfriend whose pussy had started all of this, every inch of her remade and still taking cock like she had been born to it.

"Look at you," the new Otto growled, and it was his own voice in his own throat, spoken by the wife who now wore him completely. "You're her. And you're mine."

"Yes," the woman who had been Otto sobbed, rocking back, meeting every thrust, Sonia's body singing with a libido that would not quit. "Yours. Finish in me. I want it. I want your cum. Give it to me—give me a baby. I want to carry it."

The man who had been Gwen snarled and fucked harder, doggy-style, relentless, one hand fisted in long dark hair, the other spread across a widened hip. The new Sonia's cunt clenched in rhythmic, helpless pulses, milking him, and the orgasm that hit her was nothing like the ones Otto had known. It rolled from her clit through her belly and up into her new breasts, a full-body seizure of pleasure, and she screamed into the pillow while she came around him.

He followed her over. The cock—Otto's cock, in Otto's body, driven by the woman who had woken up owning it—swelled and pulsed, and he buried himself to the root and came. Potent seed flooded the new Sonia's womb in thick, endless spurts, so much it leaked around the shaft and ran down her trembling thighs. Something in the magic caught. He felt it, a bright hot snap deep inside, Gwen's original egg quickening where the seed found it, life taking hold in a body that had not existed an hour ago.

They stayed locked together, shaking, while the last of the change settled and the last of his cum pumped into her.

Fully transformed, the new Otto eased back and pulled out of his pregnant wife, the woman Otto had become, Sonia from skin to the cunt still fluttering around nothing. Cum spilled in a thick line down one trembling thigh. Both of them were panting, skin glowing with sweat and satisfaction, the bedroom smelling of sex and the citrus memory that had started all of it.

Otto rolled onto his back in hips that were not his and looked down the olive-skinned body, curvy and wrecked, and watched his belly already begin to swell. It was not imagination. The soft curve rose under his navel, warm and tight, rounding with the child conceived from Gwen's original egg, quickened by the seed just pumped into a womb that magic had made ready. He was pregnant. Otto, thirty-two that morning, an accountant in his ex-girlfriend's flesh, carrying Gwen's child.

"You're glowing," the new Otto said. Gwen behind the eyes, smiling down at what they had become, blissful and ruined and bound to it. "We're never going back."

"I don't want to," Otto answered, and meant it. His hand rested on the growing swell. Forever altered, and the fear had burned off in the fucking, leaving only the heat of a shared, irreversible life.

The new Otto's cock, still wet, still half-hard, twitched as he watched that belly round. A plan was already moving behind Gwen's gaze in his face: on her side before the light failed, his hand on the swell, filling her slow until she came around him again. He was already scheming the next time.