The pale gray of early morning filtered through the curtains, casting long shadows across the bedroom. Katsuki lay on his back, Izuku's body curled against his side, an arm wrapped around the boy's shoulders. He'd been awake for an hour now, watching the ceiling boards darken from black to charcoal to the first hint of dawn. His body knew the rhythm — four-thirty, every morning, for forty years. But he hadn't moved. Couldn't move. Didn't want to move. Not with Izuku's breath warm against his chest, not with those small fingers curled loose against his ribs.
His guilt sat heavy in his gut, a stone he'd been carrying since yesterday. Since before yesterday. Since he'd watched Izuku walk through his door with those green eyes full of nervous hope and felt his cock twitch in response. He hired Yo. He didn't fire Yo when the kid first started making comments. He pulled away from Izuku after the sponge bath, left him on the floor covered in cum, alone and trembling. And yesterday, that distance had almost cost Izuku everything. The thought twisted in his chest, sharp and unforgiving. Should've been there. Should've protected him. That's my job. That's always been my job.
Izuku stirred against him, a small sound escaping his throat, and Katsuki's arm tightened reflexively. The boy's face nuzzled into his chest, nose brushing through the coarse hair there, and Katsuki felt his breath catch. He watched the flutter of Izuku's eyelids, the slow return of consciousness, the way those freckled cheeks softened in the half-light. When Izuku's eyes finally opened — hazy, unfocused, blinking up at him — Katsuki didn't look away.
"Papa Kats?" The name came out rough with sleep, a whisper wrapped in confusion.
"Yeah, kid. I'm here."
Izuku's hand moved, sliding up from Katsuki's ribs to his chest, palm flat over his heart. "You're still... you stayed."
"Where else would I go?" The question came out gruffer than he meant, but his hand came up to cup Izuku's cheek, thumb brushing over a freckle. "Told you I'd take care of you. Meant it."
Something shifted in Izuku's eyes — a vulnerability, a question, a desperate hope. His lips parted, and Katsuki watched the movement, the way the morning light caught the moisture there, the way they trembled almost imperceptibly. Neither of them moved. The air between them thickened, charged with everything unsaid, every confession that still sat heavy in their throats. Izuku's gaze dropped to Katsuki's mouth, lingered, then rose again to meet his eyes.
Katsuki leaned in first. Slow. Giving Izuku every chance to turn away, to close his eyes, to pretend this wasn't happening. But Izuku's hand tightened on his chest, pulling him closer, and then their lips met — soft, tentative, a question asked and answered in the same breath. It wasn't desperate like last night, wasn't broken and frantic. This was a different kind of kiss. A slow, deliberate rediscovery. Katsuki's lips moved against Izuku's with a tenderness that surprised even him, his calloused thumb tracing the line of Izuku's jaw as he angled his head, deepening the contact by degrees.
Izuku made a sound — a soft, helpless moan that vibrated against Katsuki's mouth — and his body pressed closer, leg hooking over Katsuki's thigh. The kiss deepened, tongues meeting in a slow, wet slide, tasting of sleep and morning and something that felt like home. Katsuki's other hand found the small of Izuku's back, fingers splaying across the skin where his shirt had ridden up, and he felt the boy shiver under his touch. This is wrong, a voice whispered in the back of his mind. He's your grandson. He's eighteen. He's— But the thought dissolved as Izuku's fingers tangled in his hair, pulling him closer, mouth open and hungry and full of a need that matched his own.
They broke apart slowly, foreheads pressing together, breath mingling in the narrow space between them. Izuku's eyes were wet, eyelashes clumped and dark, but he was smiling — a small, trembling thing that cracked Katsuki's chest wide open.
"I thought you didn't want me," Izuku whispered, his voice breaking on the last word. "After the bath. You just... you turned away."
Katsuki shook his head slowly, his thumb still tracing gentle arcs across Izuku's cheek. "No, kid. That ain't it. That ain't it at all." His voice came out rough, scraped raw by something he'd been carrying too long. He pulled back just enough to look at Izuku properly, to meet those green eyes that held too much trust, too much hope. "I wanted you. I still want you. That's the problem."
Izuku's brow furrowed, confusion flickering across his freckled face. "I don't—"
"You're my grandson." The words fell heavy between them, ugly and true. Katsuki didn't look away, didn't let himself flinch from the reality of it. "You just turned eighteen. I'm sixty-five years old. This is... this is wrong, Izuku. Every way you look at it, it's wrong."
"Then why—" Izuku's voice cracked, his hand still pressed flat against Katsuki's chest, feeling the steady thunder of his heart. "Why did you kiss me? Why did you hold me all night? Why do you look at me like—"
"Because I can't help it." The confession tore out of him, raw and unguarded. Katsuki's jaw tightened, his crimson eyes burning with something between shame and hunger. "Because every time you walk into a room, I wanna reach for you. Because when you sucked me off in this bed, it was the best I've felt in decades. And I hate myself for it."
Izuku flinched, but Katsuki didn't let him pull away, his hand sliding to cup the back of the boy's neck, firm but gentle.
"I'm supposed to be the responsible one here," Katsuki continued, his voice dropping lower, rougher. "I'm the adult. I'm the grandfather. It's my job to shut this down, to protect you from... from me. From this." He let out a breath, shaky and uneven. "So I thought if I just ignored it, if I kept my distance, it'd go away. You'd lose interest. You'd find some boy your own age and forget about the old man in the farmhouse."
"I couldn't," Izuku whispered, his eyes wet, his lower lip trembling. "I tried. I went to Yo because I thought maybe I just... maybe it wasn't you. Maybe I just wanted anyone. But it wasn't—he wasn't—"
"I know." Katsuki's thumb pressed against the nape of Izuku's neck, grounding him. "I know, kid. And that's on me. I shoulda been there. I shoulda protected you. Instead, I pushed you away and you almost got hurt because of it. You did get hurt cause of it.” His voice broke on the last word, cracking at the edges. "That's gonna haunt me for the rest of my life."
Izuku shook his head, tears spilling over, tracing hot paths down his freckled cheeks. "It's not your fault. I chose to go to him. I chose to—"
"Doesn't matter." Katsuki cut him off, firm but not harsh. "You were hurting because of me. You were confused because of me. And I wasn't there. That's the part I can't fix, Izuku. That's the part I gotta live with."
Silence settled between them, thick and heavy, filled with everything they hadn't said. The morning light crept further into the room, painting gold streaks across the tangled sheets. Somewhere outside, a bird called, sharp and insistent.
"So what do we do?" Izuku's voice was small, fragile, a question asked by someone terrified of the answer.
Katsuki was quiet for a long moment, his hand still cradling Izuku's neck, his thumb still tracing slow, steady patterns against his skin. When he finally spoke, his voice was low, deliberate, each word weighed and measured. "We talk about it. We stop pretending this ain't happening. We stop running from it." He met Izuku's eyes, raw and open, all his walls finally down. "I ain't saying I know where this goes. I ain't saying it's right. But I'm done pretending I don't want you, kid. And I'm done pushing you away."
Those words hung in the air between them, raw and final, a door left open instead of slammed shut. Something cracked inside Izuku's chest — the last wall he'd been holding up, the one that said this is wrong, you shouldn't, he's your grandfather. It crumbled. And before he could think, before he could second-guess, he surged forward, his hands grabbing Katsuki's face, pulling him into a kiss that was nothing like the tender ones they'd shared.
This was desperate. Hungry. Izuku's mouth crashed against Katsuki's, his tongue pushing past his lips without invitation, finding Katsuki's tongue and tangling with it in a wet, frantic dance. He moaned into Katsuki's mouth, a sound that came from somewhere deep, somewhere he'd been hiding since the moment he saw this man on the porch in that loose robe. Katsuki made a grunt of surprise, his hands coming up to Izuku's shoulders, but he didn't push away. He held on. His fingers dug into the soft skin, pulling Izuku closer, deepening the kiss until they were both breathing hard through their noses, mouths fused, spit slicking their chins.
Izuku's hands slid down, palms pressing flat against Katsuki's chest, feeling the rapid thunder of his heartbeat under calloused skin. He broke the kiss with a wet gasp, their foreheads pressing together, and when he opened his eyes, tears spilled over, tracking hot paths down his freckled cheeks. His voice came out wrecked, barely a whisper. "Papa Kats. I've wanted you since the first day. Since Dynamy tackled me and I saw your cock through your robe. I've been touching myself every night, thinking about it. About you."
Katsuki's eyes widened, his breath catching, but Izuku didn't stop. The words poured out of him, unstoppable, a confession he'd been choking on for days. "I ordered that dildo. The one you saw. It was supposed to be you. I was too embarrassed to use it, knowing you'd seen it. But I couldn't stop thinking about being filled by you. About your cock inside me." He let out a shaky laugh, tears running down his face. "I'm so fucked up. I know. But I don't care anymore."
Katsuki's hands moved up, cradling Izuku's face, his thumbs wiping at the tears. His crimson eyes were dark, pupils blown wide, his voice rough as gravel. "You're not fucked up, kid. You're just... you're everything I been trying not to want."
Izuku didn't wait. He pushed himself up, swinging a leg over Katsuki's hips, straddling him. The sweats and shirt the ambulance had given him last night felt like a cage. He grabbed the hem of the shirt and pulled it over his head, tossing it aside, then shimmied out of the sweatpants, kicking them off the bed. He sat naked on top of Katsuki, the cool morning air hitting his skin, raising goosebumps across his arms and chest. His small tits, puffy nipples hard and pink, bobbed with his heavy breathing. Between his legs, his cunt was slick, wetness already soaking through Katsuki's boxer briefs where he'd settled.
Katsuki's eyes roamed over him, slow and hungry, like he was memorizing every freckle, every curve. His gaze lingered on Izuku's chest, on the soft swell of his tits, then dropped to where their bodies met, where Izuku's bare pussy was pressed against the fabric of his boxers. A low growl rumbled from Katsuki's throat. His hands found Izuku's hips, thumbs pressing into the soft flesh, and he felt the heat radiating from between Izuku's legs.
"Fuck, kid." The words came out strangled, his cock thickening rapidly beneath the thin cotton, pressing up against Izuku's wet slit. "You're so fuckin' pretty."
Izuku's breath stuttered. He rolled his hips, a slow, deliberate grind, dragging his slick folds along the length of Katsuki's hardening cock through the boxer briefs. The friction sent a jolt through him, his clit bumping against the rough fabric, and he let out a high, desperate moan. "Papa Kats. Please. I need you."
Katsuki's hands found Izuku's hips, stilling the slow grind. His crimson eyes held Izuku's, dark and serious, the morning light catching the silver in his stubble. "Hold up, kid." His voice came out rough but gentle, a hand on the reins. "I gotta ask you somethin', and I need you to be honest with me."
Izuku's breath caught, his heart hammering against his ribs. The sudden pause after all that heat left him trembling, his slick cunt still pressing against the damp fabric of Katsuki's boxer briefs. He nodded, swallowing hard. "Okay. Anything."
Katsuki's thumb traced a slow circle on Izuku's hip, his jaw tight. "Are you a virgin?" The question hung in the air, heavy and vulnerable, and Izuku felt heat flood his cheeks, spreading down his neck. He looked away, his green eyes fixing on a spot on the pillow, and gave a small, embarrassed nod.
"Yeah," Izuku whispered, the word barely audible. "I never... I mean, I've touched myself, but I've never..." He trailed off, his freckled face burning.
Katsuki's expression softened, something tender and protective flickering behind the hunger in his eyes. He reached up, cupping Izuku's cheek, turning his face back to meet his gaze. "That's okay, baby boy." The endearment slipped out, low and warm, and Izuku's breath stuttered. "That's real okay. We just gotta take it slow, alright? I ain't gonna hurt you. I don't wanna hurt you."
Izuku's eyes welled up, but this time the tears weren't from shame or fear. They were from something else — something that felt like being held, like being precious. He leaned forward, pressing his lips to Katsuki's in a kiss that was soft and grateful, his hand sliding up to tangle in the ash-blond hair at the nape of Katsuki's neck.
Katsuki kissed him back, slow and deliberate, his hand sliding down to the small of Izuku's back, pulling him closer. When they broke apart, Katsuki's hands found the waistband of his own boxer briefs, and he shimmied them down his thick thighs, kicking them off the end of the bed. His cock sprang free, thick and heavy, already fully hard, the head glistening with a bead of pre-cum. Izuku's mouth went dry, his eyes fixed on the sight — that massive shaft, the veins running along the length, the way it curved slightly upward, the weight of it resting against Katsuki's lower belly.
"Look at me, kid." Katsuki's voice was firm but gentle, and Izuku tore his gaze away from the cock to meet those crimson eyes. "You're in charge here, alright? We go at your pace. Nothin' happens you ain't ready for."
Izuku nodded, his throat tight with emotion. He settled back down, his bare pussy pressing against the length of Katsuki's cock, the skin-on-skin contact sending a jolt through him. He let out a shaky moan, his hips starting to move in a slow, instinctive grind, dragging his slick folds along the thick shaft.
"That's it," Katsuki rumbled, his hands finding Izuku's hips, guiding but not controlling. "Keep doin' that. Rub that pretty teen pussy against my cock. Make yourself feel good."
Izuku's breath came in short, desperate gasps as he followed the instruction, his hips rolling in a steady rhythm. The friction was perfect — his clit catching against the ridge of Katsuki's cock, his wetness coating the shaft, the heat of skin on skin making his head spin. He grabbed Katsuki's hand, lifting it and pressing it against his left breast, his small tit fitting perfectly into the calloused palm. "Feel that," Izuku whispered, his voice wrecked. "Feel me."
Katsuki's fingers curled, his thumb finding Izuku's puffy nipple and rolling it gently, feeling the rapid thunder beneath the soft skin. His eyes never left Izuku's face, watching every flicker of pleasure, every moan that fell from those pink lips. "I feel it, baby boy. I feel all of it."
Izuku's hips moved faster, his grinding becoming more urgent, his cunt clenching around nothing, desperate for more. The pleasure built in his belly, hot and coiling, his clit throbbing with every pass against Katsuki's shaft. He leaned forward, bracing his hands on Katsuki's broad chest, his fingers digging into the muscle as he rode the sensation. "Papa Kats," he moaned, the name falling from his lips like a prayer. "It feels so good. I've never... I've never felt this good."
Katsuki's hand slid up from Izuku's breast to cup the back of his neck, pulling him down into a kiss that was deep and consuming, his tongue sliding against Izuku's in a slow, wet dance. When they broke apart, Katsuki's forehead pressed against Izuku's, their breaths mingling, hot and uneven. "You're doin' so good, kid. Just keep goin'. Let yourself feel it."
Izuku's eyes fluttered closed, his body moving on instinct, his hips rolling and grinding, chasing the pleasure that was building, building, building. The wet sound of his pussy sliding along Katsuki's cock filled the room, obscene and beautiful, and he let himself drown in it — in the heat, the friction, the weight of Katsuki's hands on his body, the low rumble of Katsuki's voice telling him he was doing good. He had never felt so treasured, so wanted, so completely seen.
Katsuki's hands began to move, slow and deliberate, sliding down from Izuku's hips to cup his ass, fingers digging into the soft flesh. He squeezed, kneading, and Izuku let out a shaky moan, his grinding growing sloppier as the pleasure clouded his thoughts. "That's it, baby boy," Katsuki rumbled, his voice low and rough. "Let me feel you. Let me touch all of you." His hands roamed upward, tracing the curve of Izuku's spine, the dip of his lower back, the soft give of his waist. Everywhere he touched, Izuku's skin burned, goosebumps rising in the wake of those calloused palms.
Izuku's eyes fluttered closed, his head falling back as Katsuki's hands explored him like he was something precious, something worth memorizing. The rough pads of Katsuki's fingers found his nipples, rolling them gently, and Izuku gasped, his hips stuttering. "Papa Kats," he breathed, the name falling from his lips like a prayer. "Please. I need—"
"I know what you need, kid." Katsuki's voice was firm but tender, his hands stilling on Izuku's hips. He shifted beneath him, sitting up slightly, his cock pressing against Izuku's wet slit. "But I ain't gonna fuck you yet. Not 'til I've tasted you first."
Izuku's eyes snapped open, confusion flickering through the haze of lust. "Taste me?"
Katsuki's grin was sharp, hungry, his crimson eyes dark with intent. "Get off, baby boy. Lay back on the bed. I wanna see that pretty teen pussy up close."
Izuku's face flooded with heat, his cheeks burning, but he didn't hesitate. He climbed off Katsuki's lap, his limbs clumsy with want, and laid back on the tangled sheets, his legs falling open automatically. The morning air hit his wet cunt, cool and shocking, and he shivered, his hands gripping the sheets. He felt exposed, vulnerable, laid bare under Katsuki's gaze.
"Good boy," Katsuki said, his voice dropping to a low growl. He shifted, positioning himself between Izuku's spread thighs, his broad shoulders pushing them wider. He looked down at Izuku's pussy, the slick pink folds glistening with arousal, the small bald mound smooth and vulnerable. "Fuck, look at that. Tiny little cunt, all wet for me. You been saving this for me, ain't you, kid?"
Izuku whimpered, his hips twitching, his clit throbbing under Katsuki's intense stare. "Yes, Papa Kats. Only for you."
"That's right." Katsuki leaned down, his breath hot against Izuku's inner thigh, and Izuku's whole body trembled with anticipation. "Now you're gonna feed this old pervert your cunt. Gonna let me make you cum with my mouth first. Then we'll see about anything else."
Izuku's breath hitched, his heart pounding so hard he could feel it in his throat. He nodded, his voice barely a whisper. "Okay. Yes. Please."
Katsuki didn't make him wait. He lowered his head, his tongue sliding out, and the first touch was electric—a slow, deliberate lap that started at Izuku's entrance and dragged upward, through the slick folds, over the swollen clit. Izuku's back arched off the mattress, a strangled moan tearing from his throat before he could stop it. The sensation was overwhelming, nothing like his own fingers, nothing like any toy. This was wet and hot and alive, Katsuki's tongue exploring him like he was a map, reading every tremor, every gasp.
Katsuki hummed against his cunt, the vibration sending shockwaves through Izuku's body. "Taste so good, baby boy. Sweet and fuckin' perfect." His tongue circled Izuku's clit, slow and teasing, then dipped lower, pushing inside Izuku's entrance, fucking him with his tongue. Izuku's hands flew to Katsuki's hair, grabbing the ash-blond strands, holding on like he'd drown if he let go.
"Papa Kats—oh god—that's—" Izuku's words dissolved into a broken moan, his hips bucking against Katsuki's mouth. The pleasure was building fast, too fast, a coil tightening in his belly. He could feel the wet heat of Katsuki's mouth, the scrape of stubble against his inner thighs, the way Katsuki's nose pressed against his clit with every deep lick.
And then he remembered. Eijiro. Eijiro was still in the house, probably still asleep in the guest room upstairs. The realization hit him like cold water, and he clamped a hand over his own mouth, muffling the next moan that tried to escape. He'd be screaming right now if he could—screaming Katsuki's name loud enough to wake the whole county. But he couldn't. He had to be quiet. He had to—
Katsuki's tongue found his clit again, and Izuku's eyes rolled back, his hand pressed hard against his own lips, his breaths coming in sharp, desperate huffs through his nose. Katsuki seemed to sense the shift, his tongue growing more insistent, faster, more focused, as if he was determined to make Izuku fall apart as quietly as possible.
"That's it," Katsuki murmured against his cunt, the words vibrating through Izuku's core. "Cum for me, baby boy. Let me taste it."
Izuku's body bowed off the mattress, his hand clamped so hard over his mouth his teeth bit into his palm. The orgasm ripped through him like a current, his pussy clenching and releasing in violent waves as a hot gush of liquid sprayed from deep inside him, splashing against Katsuki's tongue, his chin, pooling on the sheets beneath them. He could feel it—the release, the flood—his own wetness pouring out of him in desperate, rhythmic spurts, and somewhere in the dizzy haze he heard Katsuki's groan of surprise, felt the old man's mouth seal over his cunt, lapping greedily, swallowing everything he gave.
Katsuki's tongue worked frantically, chasing every drop, pressing flat against Izuku's clit and then dipping inside to catch the last of the squirt. He sucked, long and hard, drawing out another spasm from Izuku's trembling body, and Izuku's vision went white, his muffled scream dissolving into a choked sob. When Katsuki finally lifted his head, his chin was slick, glistening in the pale morning light, his crimson eyes wide and dark with something like wonder. "Fuck, kid," he breathed, his voice rough and reverent. "You squirt. You actually fuckin' squirt."
Izuku's arm fell from his mouth, his chest heaving, his body limp and boneless on the tangled sheets. He could barely keep his eyes open, the pleasure still buzzing through his nerves like aftershocks. "'S too much," he mumbled, the words slurred and drunken. "Papa Kats... I can't..."
Katsuki crawled up the bed, his big body casting a shadow over Izuku's smaller frame, and settled beside him, pulling the younger man into his arms. He pressed a kiss to Izuku's sweaty forehead, then another to the corner of his mouth. "You did so good, baby boy. So fuckin' perfect." His hand found Izuku's hip, rubbing slow, soothing circles into the overheated skin. "That's enough for now. We can do more later. You gotta rest."
Izuku's eyes blinked open, a flicker of protest rising through the exhaustion. "But you didn't... you didn't cum." He tried to push himself up, his hand sliding down Katsuki's chest toward his still-hard cock, but Katsuki caught his wrist, gentle but firm.
"Don't you worry about that, kid." Katsuki's voice was soft, almost tender, his thumb tracing a path across Izuku's knuckles. "I just got to watch you fall apart on my tongue. Felt you cum all over my face. That's more than enough for an old pervert like me." He tucked Izuku's head under his chin, his hand finding its way to the small of Izuku's back, rubbing slow, steady circles. "Just let me hold you, alright? That's what I need right now."
Izuku's throat tightened, a hot ache blooming behind his ribs. He pressed his face into the warmth of Katsuki's chest, breathing in the musky scent of sweat and sex, feeling the steady thrum of Katsuki's heartbeat against his cheek. "I'm sorry," he whispered, his voice cracking. "I wanted to make you feel good too."
Katsuki's laugh was low, rough, more a rumble than a sound. "You made me feel real good, baby boy. Better than you know." His hand slid up, fingers threading through Izuku's damp curls, scratching lightly at his scalp. "Now shut up and go to sleep. We got all summer. Plenty of time for me to fuck you with this old man cock."
Izuku's lips quirked into a tired smile, his eyes already fluttering closed. He shifted, curling closer, his leg hooking over Katsuki's thick thigh, his hand splayed across the broad pectoral muscle under his palm. The exhaustion was bone-deep, dragging him down into a warm, safe darkness, and he let himself sink into it, feeling Katsuki's arm tighten around his waist, the regular rhythm of his breathing, the rough palm that never stopped moving across his back.
"Papa Kats," Izuku murmured, the words barely audible, already half-asleep. "Thank you for taking care of me."
Katsuki's lips pressed against the top of his head, lingering. "Always, kid. Always."
And Izuku let go, falling into sleep with the weight of those words wrapped around him, his grandfather's heartbeat a lullaby beneath his ear, the summer morning softening around them as the first real light began to filter through the blinds.