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The Professor's Potion

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A crack AU. Two male best friends in college, Hyukjae and nerdy Donghae. Hyukjae was involved in an experiment (by professor Kim Heechul) where he turns into a voluptuous lady after taking the professor concoction. He could turn to male only after someone comes in him. So he could only ask his best friend Donghae to turn him back into a male. Donghae who had always love Hyukjae (even as a male) agreed willingly.

Chapter 15: Milky Madness

The burnt garlic smell was losing its battle against the scent of vanilla candle Donghae kept lighting in a futile attempt to cover it. Hyukjae stared at the flame’s wavering reflection in the dark kitchen window. Her own face looked back, softer, stranger. The “Blanket Fog” paint sample was still taped to the wall, a mute spectator.

Her body felt different tonight. Not just heavy or aching, but humming. A restless, low-voltage current under her skin. The baby had been quiet all day, a lazy ocean inside her, but she felt like a live wire. The loose t-shirt she wore—Donghae’s old Dripping Hongdae one—felt abrasive. Her nipples were painfully sensitive, brushing against the cotton with every shift of her breath.

Donghae was at the small table, a textbook open under the dim glow of the single bulb. His brow was furrowed, a pencil tucked behind his ear. The domestic normalcy of it, the sheer mundanity, grated on her raw nerves. He was studying about tectonic plate shifts while her entire personal geography was being rewritten.

“Can you even concentrate?” Her voice cut through the quiet.

He looked up, blinked as if returning from a faraway place. “Hmm? Yeah. It’s just revision.”

“I can’t sit still.” She pushed away from the window, pacing the short length of the kitchen. Her breasts moved heavily with each step, a lush, annoying weight. “Everything itches. My skin feels three sizes too small.”

He watched her, his eyes tracking her movement. She saw the shift in his gaze, the slow focus moving from her face down the length of her body. The pencil behind his ear was forgotten.

“Come here,” he said, his voice dropping.

It wasn’t a request. It was a quiet command that sparked something hot in her gut. She stopped pacing. She walked to him, the sound of her bare feet on the linoleum loud in the silent room. He pushed his chair back from the table, creating a space. He didn’t pull her onto his lap. He just waited, his hands resting on his thighs, his eyes dark pools in the low light.

She understood. This was her move.

She swung a leg over him, straddling his lap while he was still sitting in the wooden chair. It was a clumsier motion than it used to be, her balance shifted by the swell of her belly. She settled onto him, her center coming to rest against the hard ridge of his erection straining through his sweatpants. The contact made them both gasp. He leaned back to look up at her, his hands coming to rest on the generous curve of her hips.

She took his face in her hands, her thumbs stroking the sharp lines of his cheekbones. “You’re not studying,” she whispered.

“No,” he admitted, his voice rough. “I’m thinking about how full your tits look in that shirt.”

A sharp thrill shot through her. She rolled her hips, grinding down against him, a slow, deliberate rotation. The fabric between them was a maddening barrier. She could feel the wetness already seeping from her, a hot dampness soaking through her panties and onto his sweats.

“You did this,” she said, leaning forward so her breasts pressed against his chest. Her lips brushed his ear. “You filled them up. You planted this thing inside me that makes them ache.” She took his hand and guided it under her shirt, placing his palm directly on the bare, heavy swell of her breast. His fingers immediately closed, his thumb finding her nipple and rubbing it to a stiff, desperate peak.

He groaned, his head falling back. “Fuck, Hyukjae.”

She pulled the shirt over her head in one swift motion, tossing it aside. The cool air hit her skin, her nipples tightening into hard, dark points. They were already beaded with moisture, a few drops of milky white forming at the tips. Donghae’s gaze was locked on them, hungry, reverent.

“Taste,” she ordered, arching her back, offering herself.

He didn’t need to be told twice. He leaned forward and took her left nipple into his mouth, sucking hard. The pull was immediate, intense, a direct line from her breast to her clit. A rivulet of warm milk escaped the corner of his mouth, tracing a wet path down the slope of her breast. He drank, his throat working, his hands gripping her hips, holding her steady as she began to rock against the hard length beneath her.

She was making noises, little gasps and whimpers, her fingers tangled in his hair. Her other breast, untouched, began to leak a steady stream, the milk trickling down her skin, dripping onto his bare chest. The sight of it—the white streaks on his skin—was overwhelmingly erotic.

He switched to her other breast, drinking deeply, while his hand slid from her hip, down over the mound of her belly, to the waistband of her pajama shorts. He shoved his hand inside, his fingers sliding through her soaked curls, finding her slippery, swollen folds.

“You’re fucking drenched,” he growled against her skin.

“It’s your fault,” she panted, riding his hand now, her movements becoming frantic. “You made me like this. All… all sensitive and fuckin’ wet all the time.”

He pushed two fingers inside her without warning, curling them upwards. She cried out, her body clamping down on the sudden intrusion. He pumped his fingers slowly, his mouth still working at her breast, sucking and pulling milk in rhythm with his thrusts.

“Donghae… I need…” She couldn’t finish the sentence. She was burning up, every nerve ending screaming.

He withdrew his fingers, and she whimpered at the loss. He gripped the waistband of her shorts and panties and yanked them down, helping her lift her hips just enough to get them off her legs. They joined the shirt on the floor.

Then he pushed his own sweatpants and boxers down just enough to free his cock. It stood thick and urgent, the head glistening in the dim light. He grasped himself, stroking once, twice, before positioning the blunt tip at her entrance.

She didn’t wait for him to guide her. She sank down onto him in one slow, inexorable slide, her body stretching to accommodate his girth. The feeling of being utterly filled, penetrated so deeply while her milk dripped onto his skin, shattered her. A raw, guttural moan tore from her throat.

For a moment, neither of them moved. She was impaled on him, full to the hilt, her swollen belly pressed flush against his abdomen. Their faces were inches apart, breaths mingling. She could see every fleck of gold in his blown pupils, every particle of desperate love and dark desire.

Then she moved. She planted her hands on his shoulders for leverage and lifted herself up, almost letting him slide out, before driving back down with a force that made the wooden chair groan in protest.

“Yeah,” he hissed, his hands flying to her ass, gripping the fleshy cheeks, helping her set a punishing rhythm. “Just like that. Ride me. Use me.”

The chair creaked violently with each plunge, a sharp, rhythmic complaint against the silence of the apartment. Her breasts bounced heavily with the motion, milk spraying in tiny arcs with each impact. The sounds were obscene—the wet slap of their skin, her desperate whimpers, his choked grunts, the screech of the wood.

“You feel so deep,” she moaned, her head falling back. “I can feel you… fuck… right there.”

“Where?” His voice was strained, teeth clenched. “Tell me.”

“Inside,” she gasped, slamming down onto him again. “Like you’re punching right into my womb. Like you’re fucking our baby.” The words were filthy, shocking even to her own ears, but they poured out, molten and true.

A violent shudder ran through him. His fingers dug into the soft flesh of her ass, surely leaving bruises. “Say it again.”

She leaned forward, her lips against his ear, her voice a hot, wet whisper as she rode him with relentless, desperate strokes. “Fuck me deeper, daddy. Your baby wants more of that big cock.”

The word—daddy—unlocked something feral in him. A growl erupted from his chest. He bucked his hips up to meet her downward thrusts, driving into her with new ferocity. The chair legs scraped against the floor. The bottle of coffee on the counter rattled.

She was climbing, fast and uncontrollable. The coil of pleasure wound so tight it was a physical pain in her lower belly. The stimulation was everywhere—the deep, grinding penetration, the rough friction of her clit against him, the sweet, pulling ache in her breasts.

“I’m gonna come,” she warned, her voice breaking. “Don’t stop, don’t you fucking stop!”

“Come,” he demanded, his hands sliding up her back to press her against him, her milk-smeared chest slick against his. “Come all over my cock. Soak it.”

The command broke her. Her orgasm ripped through her with a force that whited out her vision. She screamed, a raw, ragged sound as her internal muscles clamped down on him in a series of rhythmic, vicious pulses. She shook, convulsing, her nails digging into the skin of his shoulders.

Her climax triggered his. With a roar that was half her name, half pure animal sound, he drove up into her one final time, burying himself to the root, and held there. She felt the hot, pulsing rush of his release filling her, jetting deep inside in wave after wave, a flood that seemed endless.

The world narrowed to the feel of him pulsing within her, the rush of heat, the frantic beat of their hearts against each other’s skin. Slowly, the violent shudders subsided. She collapsed against him, boneless, her face buried in the sweaty hollow of his neck. He held her, his arms wrapped tightly around her, their bodies still joined, his softening cock still sheathed inside her.

The only sounds were their ragged breaths and the creak of the abused chair settling.

After a long time, he nuzzled her hair. His voice was a wrecked, tender scratch. “We’re gonna break that chair.”

A weak laugh bubbled out of her. It felt good. Light.

He shifted, gently disentangling them. He helped her stand, her legs wobbling. Milk still slowly leaked from her nipples, trailing down her stomach, mingling with the sweat and other fluids. He looked at her, a beautiful, ruined mess in the dim light, and his expression was one of awe.

He reached for the box of tissues on the counter, pulling a few. He didn’t hand them to her. He gently wiped the milk from her breasts, then the sticky dampness from between her thighs. The gesture was so profoundly intimate it made her throat tighten.

She looked down at the sticky note still on the fridge. "Don’t forget the last ingredient." She’d asked him what it meant last week. He’d shrugged. “A recipe I was trying. Forgot to write down the vanilla.”

Now, watching his careful, devoted motions, she wondered if the last ingredient had always been this—this brutal, beautiful mess of love and sweat and consequence.

He stood up, disposing of the tissues. He took her hand, his own still trembling slightly. “Come on,” he said softly. “Let’s get cleaned up.”

She followed, her body humming with a profound, sated exhaustion. The restlessness was gone, burned away in their frantic coupling. For now, in the quiet aftermath, she felt anchored. Real. His.

Water ran in the bathroom, a distant, soothing sound. He led her not to the shower, but to the edge of his unmade bed, sitting her down as if she were something fragile. The adrenaline seeped away, leaving her feeling hollowed-out and strangely transparent. She watched him kneel on the floor between her parted knees, a damp washcloth in his hand. The cool cotton traced her inner thighs, cleaning away the evidence of their frenzy with a slow, methodical tenderness that made her chest ache.

"Look at you," he murmured, his voice a low vibration in the quiet room. He wasn't looking at the mess. His eyes were fixed on her face, her damp eyelashes, the vulnerable line of her mouth. He dabbed at a stray droplet of milk on her sternum. The cloth moved with a reverence that felt sharper than any of his earlier roughness.

"You're okay?" he asked, the question absurd given the scene in the kitchen.

She nodded, a jerky motion. "Just… post-coital weirdness." She tried for her old smirk. It faltered.

The tenderness was a foreign country. It unnerved her more than the frantic sex, the swollen belly, the leaking breasts. This quiet care felt like a precipice. Donghae remained kneeling, the washcloth forgotten in his hand. His gaze held hers, unblinking. The ambient light from the kitchen cut across the planes of his face, highlighting a tension that had nothing to do with lust. It was the stillness before a seismic shift.

He took a breath so deep it shook.Then another. His free hand reached for hers, his fingers intertwining with hers tightly, palm to palm. His skin was warm, slightly rough. His thumb stroked her knuckles.

"Hyukjae," he began, and the name hung in the air, weighted.She knew. Perhaps some part of her had always known, from the moment he’d left the back door unlocked, from the frantic scribbles on his sticky notes about ingredients he'd never quite named. It was in the way he looked at her now—not at the body, but at the blurry ghost of his best friend shimmering behind it.

"I have to say something," he said, the words measured but urgent. "If I wait, I'll… I'll lose my nerve. And I can't lose my nerve about this."

Her heart began a frantic, stuttering rhythm against her ribs. This wasn't the script. They fought, they fucked, they grappled with the impossible. They didn't do this.

"Donghae, don't," she whispered, a preemptive strike.

"I have to." His grip tightened. "All of this… the baby, the change, the fucking chaos… it's just… noise. Underneath it, it's always been you. It was you in the male body I fell in love with, and it's you in this one I can't live without. It's the smirk, the stupid jokes, the way you get stubborn about noodle brands. It's the soul of you, Hyuk, and it's the only thing that's ever made sense to me."

He was speaking faster now, the words tumbling out, tripping over each other in their rush to be heard. "I don't care what shape you're in. I don't care if we're both men, or both women, or something Professor Kim screwed up in a lab. I want to wake up with you. I want to argue with you about paint colors. I want to watch you get fat with my children and then bitch about your dance pants not fitting."

A wet, choked sound escaped her. Her vision blurred.

"I want the chaos," he said, his own eyes glistening. "But I want it with you.Officially. Permanently." He released her hand. He fumbled in the pocket of his discarded sweats, which lay in a heap by the bed. His fingers, trembling slightly, closed around something small.

He brought it out. It wasn't a ring box. It was a simple, silver band, slightly tarnished, resting in the center of his palm. It looked old. "This was my grandmother's," he said, his voice thick. "She told me to give it to the person who felt like home, even when home was on fire."

He looked from the ring to her face, his expression naked, completely unguarded. He took her left hand again. "Lee Hyukjae. Will you marry me?"The world stopped. The hum of the fridge, the drip of the tap, the distant city sounds—all of it folded into a profound, echoing silence. All she could see was the ring, so simple and serious, in his calloused palm. All she could feel was the tectonic plates of her reality grinding, reshaping into a continent she hadn't dared to map.

A sob cracked her open. It started deep in her gut, a raw, helpless sound that tore free. Then another. She wasn't just crying; she was unraveling. Years of friendship, months of fear and confusion and arousal and self-loathing, all of it liquefied and poured from her eyes. She crumpled forward, her forehead coming to rest against his, their breath mingling in the salt-tinged space between them.

Her shoulders shook. She couldn't speak. She could only nod, a frantic, desperate dipping of her head as the tears fell hot and fast onto their joined hands. She nodded and nodded until he understood, until he slid the cool metal over her knuckle. It settled at the base of her finger, a tiny, undeniable weight.

He pulled her onto the floor with him. They knelt together on the rough carpet, a tangle of limbs and tear-streaked skin, clinging to each other. He kissed her forehead, her wet cheeks, her eyelids. "Shhh," he kept murmuring, but he was crying too, quiet tears that tracked through the sheen of sweat still on his temple.

They stayed like that for a long time, until the storm of feeling subsided into a series of shuddering sighs. The room grew darker as the motion-activated light in the kitchen clicked off, leaving them in the deep blue gloom of streetlamp glow through the window.

Eventually, still on the floor, they began to move again. This time it was different. There was no frenzy, no demanding heat. It was a slow, searching reconnection. He laid her back gently on the carpet, the fibers scratching her bare skin. He kissed her collarbone, the slope of her milk-heavy breast, her swollen belly. He moved down, parting her thighs with infinite care, and put his mouth on her.

The tenderness was almost unbearable. His tongue was a soft, persistent stroke, laving her with a focus that felt like worship. He wasn't trying to make her come quickly; he was mapping her, relearning her in this new context of promise. She tangled her fingers in his hair, not to guide him, just to feel the solid reality of him there.

When she came, it rose slowly, a deep, spreading warmth rather than a shattering peak. It pulsed through her, a quiet detonation that left her breathless and boneless. He crawled back up her body, his face glistening. He kissed her deeply, letting her taste herself on his lips.

He was hard again, his cock pressing against her thigh. He positioned himself, and she wrapped her legs around his waist, pulling him close. He entered her in one smooth, deep push. They both sighed at the feeling, a perfect, full completion. He began to move, a slow, rolling rhythm that felt less like fucking and more like a conversation their bodies were having.

The metal of the ring pressed against his back as her hands roamed. The unfamiliar sensation on his skin made him pause, look down at her hand splayed on his shoulder. He smiled, a soft, private thing, and leaned down to kiss her again.

They moved together in the half-light, the only sounds their breathing, the soft slap of skin, the whisper of carpet beneath them. The urgency was gone, replaced by something deeper, more resonant. Each thrust was a vow, each gasp a seal.

As the feeling built again, coiling deeper and sweeter this time, she felt him begin to tremble. His thrusts lost their measured pace, becoming more urgent, more possessive. He buried his face in her neck. "Hyuk," he groaned, the sound muffled against her skin.

It pushed her over. Her climax unspooled in long, sweet waves, milking him, pulling him deeper. He followed, his release spilling into her with a low, broken cry, his entire body shuddering as he emptied himself.

He collapsed onto her carefully, his weight mostly on his forearms. They stayed locked together, panting, slowly floating back down. After a few minutes, he softened and slipped from her, a warm trickle following. He shifted to her side, pulling her against him, her back to his chest. One hand rested on her belly, the other found her left hand, his fingers stroking the new ring.

The silence was peaceful, thick with spent emotion. Then, in the dark, her voice came, hoarse and small. “Hae?”

“Hmm?”

She wriggled slightly, pressing her ass back against the damp evidence of their joining. “Fuck.” A soft, incredulous laugh breathed out of her. “Are you planting another baby in me? Right after you propose? What is this, a fucking package deal?”

His chest shook with silent laughter against her back. He nuzzled her hair. “Maybe.”

She turned her head on the pillow, trying to see his face in the dark. “I want you harder, you know. Normally. Why are you so soft with me today?” Her voice was a whisper. “Fuckkk.”

His arm tightened around her. He kissed her shoulder. “Because,” he said, his voice thick with sleep and absolute certainty. “Today isn’t normal. Today is the first day of the rest of it.”

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