The curry comb scraped through Katsuki’s chestnut coat in long, firm strokes, raising dust and the sharp, clean scent of horse into the stable’s warm air. Izuku worked in a focused silence, his movements practiced now after weeks of this evening ritual. The rhythm was meditative: the scrape of metal, the shift of massive muscle under his hands, the soft snort from Katsuki as he leaned into the pressure. It was the one time their dynamic settled into something like peace.

“You missed a spot,” Katsuki grunted, not looking back. “Behind my shoulder. It’s fucking itchy.”

“Right. Sorry.” Izuku’s voice was soft, earnest. He moved to the indicated area, his fingers brushing the sleek hide before following with the comb. He worked over the powerful curve where Katsuki’s human back met the equine withers, a junction he now knew gathered sweat and dirt. As he leaned in, his gaze drifted down the centaur’s flank, following the path of his grooming.

And then he saw it.

The thick, fleshly sheath was a familiar part of the anatomy he cleaned around with careful detachment. But now, from its opening, the blunt, dark tip of Katsuki’s cock was emerging. It was a slow, inevitable unveiling, the way it sometimes happened during grooming—a purely biological response. But Izuku had never truly looked. Not like this. The tip lengthened, drooping slightly, then more, revealing a shaft that was thick, veined, and utterly massive. It was a horse’s cock, full and heavy, and it was growing, right in front of him, under his ministrations.

Izuku’s hand stilled. The curry comb hung forgotten in his grip. His own breath vanished from his lungs. A hot, immediate ache clenched low in his belly, a sharp pull of want so visceral it felt like a physical blow. His pussy, the small, secret part of him he kept hidden and shaved and private, went slick and soft in an instant. The sensation was a shocking, wet truth against his work pants.

“The hell’s your problem?” Katsuki’s voice cut through the thick silence. He had twisted his upper body to look back, his crimson eyes sharp and knowing. They flicked from Izuku’s frozen face down to his own exposed cock, then back up. A slow, grating smirk spread across his face. “It’s just a cock, Deku. Don’t tell me you’ve never seen one before. Don’t you have one?”

The question hung in the air, taunting. Izuku’s face burned. He looked down, away from that knowing gaze and the impossible thickness still steadily emerging from its sheath. His throat was tight. “I… it’s not…” he stammered, the words dying in the humid air.

Katsuki’s smirk didn’t fade. He shifted his weight, a deliberate movement that made his equine half adjust, the powerful muscles rippling. The motion made his cock bob slightly, a blatant, living thing. “Spit it out, city boy. What, you some kinda virgin? Or is it that you don’t got the right equipment?”

The words were a direct hit. Izuku flinched. His eyes stayed locked on the dusty floorboards, on his own worn boots. The confession was a whisper, torn from him. “I don’t. Have one. I’m… built different.”

“Different,” Katsuki repeated, the word a low rumble. He was fully turned now, his human torso a sculpted wall facing Izuku, his equine cock an undeniable presence between them. “Explain.”

“I’m trans,” Izuku breathed out, the admission feeling both terrifying and absurd in the context of the stable, the sweat, the animal heat. “I have… a pussy.” The crude word felt alien in his earnest mouth, but anything else would have been a lie. And lying to Katsuki felt impossible right now. His whole body was screaming the truth, a wet, aching pulse between his legs that contradicted every rational thought. This was wrong. It was interspecies. It was insane.

Katsuki was silent for a long moment. The only sounds were the stable’s creaking timbers and the distant call of a night bird. Then he let out a short, sharp breath that wasn’t quite a laugh. “A pussy,” he said, as if testing the word. His crimson eyes raked over Izuku’s lean frame, the work shirt, the trousers, seeing through all of it. “And is that pussy of yours wet right now, Deku? From looking at my cock?”

"No," Izuku choked out, the lie brittle and immediate. He took a stumbling step back, his boots scuffing loud on the floorboards. He couldn't look up. "It's not—it's just biology. I was surprised, that's all."

Katsuki’s laugh was a low, derisive huff. "Bullshit. You stopped breathing." He took a single, heavy step forward, the clop of his hoof final. The movement brought the thick heat of his body closer, the scent of musk and clean sweat overwhelming. "Your face went white, then red. You’re shaking right now."

"It's not," Izuku insisted, his voice cracking. He took another step back, his spine hitting the rough wood of a support beam. The impact jarred him. "I have to—the tools need oiling."

He ducked under Katsuki’s arm, a frantic, graceless movement, and bolted for the stable door. The evening air hit his flushed face like a cold slap. He didn’t stop running until he was on the porch of the small farmhouse, fumbling with the lock, his hands shaking too badly to fit the key.

Inside, he slammed the door and leaned against it, chest heaving. The silence of the house was a hollow contrast to the stable’s thick atmosphere. He could still smell the hay, the sweat, the musk. His pussy throbbed, a slick, aching pulse that made his knees weak. He pressed a hand hard against his fly, a pathetic attempt to stifle the feeling. It was wrong. It was insane.

Back in the stable, Katsuki didn’t move. He stood in the pool of yellow light, his cock still heavy and full, now utterly ignored. A slow, wide smirk pulled at his mouth. "Ran," he muttered to the empty air. "Fucking ran."

He looked down at himself, at the blatant evidence of his own arousal. It wasn't just grooming. It was the city boy's focused hands, his nervous silence, the way his breath hitched when he worked over a particular muscle. It was the confession, whispered like a sin: *I have a pussy.*

"A pussy," Katsuki said aloud, the word rough in his throat. His mind, against all practical sense, supplied an image. Not the clinical fact of human female anatomy, but *Izuku's*. Lean hips. Those strong thighs he’d seen straining as Izuku hauled feed sacks. What would he find between them? Neat and shaved, probably. Pink and soft. Would it be as earnest and flustered as the rest of him? Would it clench?

He shifted, his cock bobbing with the movement, a fresh bead of moisture welling at the tip. The thought shouldn’t be hot. It was a complication. A distraction from work. But the stable was quiet, and the image wouldn’t leave. Izuku, face burning, denying the wetness Katsuki could practically smell on him. That stubborn, determined nerd, coming apart under him.

With a grunt, Katsuki turned and clopped toward his stall. He didn’t bother to resheath himself; there was no point. The need was a low, persistent thrum in his blood. He nudged the stall door closed with his hip, the latch falling into place with a final click.

Outside, the farm was dark. The light in the farmhouse’s bedroom flicked on, a small, bright square in the night. Katsuki’s eyes tracked it. He imagined Izuku in that room, peeling off those work clothes, touching himself maybe, thinking of the cock he’d just seen.

"Pathetic," Katsuki growled, but the insult lacked its usual bite. It was just a word. The truth was the heat coiling in his gut, the possessive curiosity. His little owner. With his little pussy. Wanting what he couldn't even admit to wanting.

He lowered his head, breathing deep the scents of his own stall—hay, leather, animal. Underneath it all, lingering on his skin, was the faint, clean soap smell of Izuku’s hands. Katsuki smirked again, a dark, promising thing in the shadows. The city boy had no idea what he’d started. No idea at all.

Katsuki’s hand wrapped around his own cock, the heat of it a brutal shock even to him. He leaned his human back against the stall wall, the rough wood biting into his shoulders, and let out a low, gritted groan. The image was seared behind his eyes: Izuku’s frozen stare, the way his lips had parted, the frantic denial. “A pussy,” Katsuki growled into the dark, his fist beginning a slow, punishing slide up the thick, veined shaft. Precum slicked his path, the smell musky and sharp.

“Fucking Deku,” he muttered, his head tipping back. His hips gave a slight, involuntary thrust into his own grip. “Making a mess of everything.”

He didn’t imagine some faceless body. He imagined Izuku’s. Those strong, stubborn thighs he’d seen straining all day—how they’d shake if they were spread. That lean stomach, tense. The small, soft tits he’d only guessed at under those work shirts, the brown nipples pebbled tight from fear or want. And lower. The neat, shaved pussy he’d confessed to, pink and soft and so fucking wet for him.

“You wanted to look, didn’t you?” Katsuki’s voice was a ragged whisper, his strokes tightening. “Stared like you’d never seen anything real. Bet your little cunt was dripping.”

He pictured it clearly, vividly: Izuku not running. Izuku staying, those green eyes wide and dark, stepping closer instead of back. His small hands, the ones that groomed him with such careful focus, reaching out. Not to push away. To touch.

“Would you even know what to do with it?” Katsuki panted, the rhythm of his hand turning rough, urgent. His equine legs braced, hooves scraping the stall floor. “Or would you just stand there, trembling, waiting for me to show you?”

He saw himself closing the distance, the shadow of his body swallowing Izuku’s. A hand fisting in those green curls, not to hurt, but to hold. To make him look. To make him see what he’d asked for. The blunt, leaking head of his cock nudging against Izuku’s stomach, leaving a wet, hot trail.

“You’d cry,” Katsuki decided, a dark, sure heat coiling at the base of his spine. “You’d fucking cry when I pushed you down. But you’d open up for me anyway.”

His breath came in sharp grunts now, the sound raw in the quiet stable. The fantasy shifted, crystallized. Izuku on his knees in the hay. Not in submission, but in wonder, his freckled face flushed, his lips parted. The first, tentative touch of his tongue.

“Shit,” Katsuki hissed, his hips jerking. The orgasm built not as a wave, but as a sudden, wrenching tide. It tore through him, a blinding, possessive claim. His cock pulsed violently in his fist, thick stripes of cum painting the straw-dusted floor in front of him. He rode it out with a final, guttural sound, his body taut, the image of Izuku’s overwhelmed face the only thing in his mind.

For a long minute, there was only the sound of his ragged breathing. The heat receded, leaving a hollow, charged quiet. He looked down at the mess, at his own spent cock, still heavy in his hand. A slow, smug smirk touched his lips, devoid of any shame.

In the farmhouse, the bedroom light was still on. A small, bright square in the vast dark. Katsuki’s crimson eyes fixed on it, the smirk deepening. “You’re thinking about it right now, aren’t you, nerd?” he said to the window, his voice low and sure. “You’re in there, and you’re thinking about me.”