Katsuki’s fingers worked slowly inside him, stretching the tight, slick heat. The wetness was obscene. It coated his knuckles, dripped down onto the sleeping bag beneath Izuku’s thighs with a soft, steady sound. “Fuck,” Katsuki breathed, the word ragged. “Look at you.”

Izuku’s head tipped back, his green curls dark with sweat against the fabric. “It’s—ah—because of you.”

“I know.” Katsuki’s voice was low, a gravelly rumble of pure possession. He curled his fingers, watching Izuku’s back arch off the ground. “All for me. This fucking… river.” He added a third finger, and Izuku cried out, a sharp, broken sound that wasn’t pain.

“Daddy—”

“Shut up.” It wasn’t anger. It was focus. Katsuki pulled his fingers free, glistening and soaked. He brought them to his own face, staring at the slick shine in the dim tent light. Then he lowered his head between Izuku’s spread thighs.

He hesitated. His breath washed over Izuku’s swollen clit, making the boy shudder violently. The air between them was thick with musk and salt and want.

“Just… do it,” Izuku pleaded, his voice trembling.

Katsuki’s tongue touched him. A hesitant, flat stroke over the aching nub.

The taste exploded across his senses—sharp, salty, profoundly intimate. It was Izuku. His boy. The reality of it punched through the last fragile wall in Katsuki’s mind. A rough groan vibrated against Izuku’s skin.

Then he drove in.

His mouth sealed over him, tongue laving broad and desperate. He ate at him like a starving man, one hand pinning Izuku’s hip to the ground, the other fisting in the sleeping bag. The sounds were filthy: wet suction, choked gasps, Katsuki’s own ragged breathing through his nose.

“Oh god—oh fuck—” Izuku chanted, his hands flying to tangle in Katsuki’s spiked hair, not to guide but to hold on as his hips jerked up into that devouring heat.

Katsuki came up for air, his lips shining. “You taste like fucking sin.” He dove back down before Izuku could reply, his tongue spearing inside this time, fucking him with it, drinking him in.

Izuku was sobbing now, overstimulated and shaking apart. “I can’t—I’m gonna—”

Katsuki lifted his head just enough to growl against his thigh. “You come when I say you can come.” Then he sucked his clit back into his mouth, hard.

Katsuki sucked harder, a relentless, pulsing pressure that made Izuku’s vision whiten at the edges. His hips bucked off the sleeping bag, a frantic, involuntary rhythm. “Daddy—please—”

“I said no.” The words were muffled against his skin, vibrating through his clit. Katsuki’s hand on his hip was an iron clamp, holding him down, forcing him to take it.

“I can’t—I can’t hold it—” Izuku sobbed, his fingers twisting in Katsuki’s hair, pulling hard. The pleasure was a live wire, sparking up his spine, coiling tight in his gut. He was right there. Teetering.

Katsuki pulled off with a wet pop. His lips were slick and swollen. “You can.” He blew a cool stream of air over the throbbing nub, and Izuku whimpered, his whole body seizing. “You will.”

He didn’t go back with his mouth. Instead, he pushed his soaked fingers back inside Izuku, three of them now, stretching him open in a slow, cruel twist. He watched his own hand work, watched the way Izuku’s body swallowed him up. “Look at this,” he commanded, voice rough.

Izuku lifted his head, chin trembling. The sight of his father’s thick fingers buried inside him, glistening with his own wetness, punched a broken noise from his throat.

“See what you do?” Katsuki curled his fingers, pressing deep. “See how fucking wet you get for me? For your dad?”

“Yes,” Izuku gasped. “Yes.”

“Tell me.”

“I’m wet for you.” The confession spilled out, hot and shameful and true. “Only you.”

Katsuki’s control cracked for a second—a flash of something wild and desperate in his red eyes. He withdrew his fingers slowly, then brought them to Izuku’s mouth. “Taste it.”

Izuku hesitated for only a heartbeat before opening his lips. Katsuki pushed his fingers inside, and the taste exploded on his tongue—salty, musky, intimately familiar and completely foreign. He sucked them clean, eyes locked on his father’s.

A low groan rattled out of Katsuki’s chest. “Fuck.” He leaned down, capturing Izuku’s mouth in a brutal kiss, sharing the taste between them.

When he broke away, both of them were breathing like they’d been running. Katsuki rested his forehead against Izuku’s. His voice was barely audible. “You ruin me.”

Then he was moving down again, but not to where Izuku expected. He kissed a burning trail down his sternum, over the soft swell of his chest, taking one peaked nipple into his mouth. He sucked hard, tongue flicking, while his hand found its way back between Izuku’s thighs.

He didn’t use his fingers this time. He used the heel of his palm, pressing firm circles against Izuku’s clit through the slick folds.

The dual sensation—the sharp pull at his nipple, the relentless pressure below—made Izuku cry out. “Oh god—”

“Close?” Katsuki murmured against his skin.

Izuku could only nod desperately.

“Ask for it.”

“Please,” Izuku begged immediately. “Please let me cum.”

Katsuki lifted his head. His eyes were dark pools in the tent's shadowed heat. He shifted lower again, settling between Izuku’s thighs with a terrifying focus. His breath ghosted over him once more.

“Now,” Katsuki said.

His mouth closed over him again just as he pushed two fingers back inside deep.

Izuku came with a shattered cry, his back arching off the sleeping bag. It wasn’t a gentle release—it was a violent, pulsing gush of wet heat that splashed over Katsuki’s chin, his lips, his cheek. Thick and hot, it kept coming in rhythmic spurts, soaking his father’s face.

Katsuki didn’t pull away. He stayed buried there, mouth and fingers working through every convulsion, drinking him in until the last tremor faded and Izuku collapsed, boneless and gasping.

Slowly, Katsuki lifted his head. His face was glistening. He looked wrecked. He swiped a thumb through the mess on his cheek, then brought it to his lips, eyes locked on Izuku’s spent form. He tasted it deliberately. “Fuck,” he breathed, the word full of awe.

Izuku could only watch, chest heaving. “I… I’m sorry.”

“For what?” Katsuki’s voice was gravel. He crawled up Izuku’s body, his knees bracketing his hips. He loomed over him, dripping. “Look at me.”

Izuku looked. His father’s face was painted with him. The sight sent a weak, aftershock throb through his core.

“You see this?” Katsuki asked, low and intense. “This is you. All over me.”

“I see it.”

“Good.” Katsuki lowered himself until their foreheads touched. His breath was hot and shared. “Now clean it up.”

Izuku’s brain stuttered. “What?”

“You heard me.” Katsuki’s tone brooked no argument. “Use your tongue.”

A fresh wave of heat flooded Izuku’s cheeks, but it wasn’t shame. It was something darker, more obedient. He lifted a trembling hand to cradle Katsuki’s jaw and guided him down. He started at the strong line of his father’s throat, licking a slow, tentative path upward through the salty-sweet tang of his own release.

Katsuki shuddered above him, a full-body tremor he couldn’t suppress. “That’s it,” he murmured, his hands coming up to fist in Izuku’s curls. “Get it all.”

Izuku reached his chin, then his cheekbone, lapping carefully at the sticky trails. When he reached the corner of Katsuki’s mouth, he hesitated.

“Open,” Katsuki commanded softly.

Izuku did. He kissed him, licking into his mouth, sharing the taste completely now—a closed circuit of desire. Katsuki groaned into the kiss, deep and hungry.

When they finally broke apart, both were breathing hard again. Katsuki rested his weight on his elbows, caging Izuku in. His huge cock strained against the confines of his pants, a thick, urgent pressure against Izuku’s thigh.

“Feel that?” Katsuki ground down once, making Izuku gasp.

“Yes.”

“What do you want?”

The question hung in the humid air between them. Izuku’s eyes dropped to the prominent bulge before flicking back up to meet the stormy red gaze.

“You,” Izuku whispered. “Inside my mouth.”

A muscle jumped in Katsuki’s jaw. The control was visibly cracking now, splintering under the weight of that simple request.