The jacuzzi hummed its low, steady pulse, steam rising in lazy spirals around their bodies. Izuku's head rested against the padded edge, his pregnant belly floating just beneath the surface, the water rippling with each soft breath. Katsuki sat across from him, knees drawn up, arms wrapped around his shins—still coiled even in relaxation, even after everything.
"You're staring, Kacchan." Izuku's voice came out soft, almost teasing, his eyes still closed.
"So what if I am?" Katsuki's voice was rough, post-sex gravel, but there was no edge in it. Just exhaustion. Just wonder. "Can't look at my own mom?"
Izuku opened his eyes, finding his son's crimson gaze fixed on him with that hungry, reverent intensity that made his chest ache. "You can look all you want, baby boy. I'm yours."
The words hung in the steam-thick air, heavier than they should have been. Katsuki's jaw tightened, and he looked away, staring at the swirling water between them.
"Yesterday." He stopped. Swallowed. "That was... I didn't know it could be like that."
"Like what?" Izuku asked, though he knew. He wanted to hear his son say it.
Katsuki's fingers traced patterns on the surface of the water. "Like being home. Like..." He shook his head, frustrated. "I don't got the words for it, okay? But when I was inside you, when you held me after—I didn't feel like I was gonna lose you anymore."
Izuku's throat tightened. He pushed himself forward, water sloshing, until he could reach out and cup his son's face. Katsuki let him, leaning into the touch like a starving thing.
"You're not losing me, Kacchan. Ever." Izuku's thumb traced the sharp line of his cheekbone. "You're my first baby. My favorite baby. Nothing changes that. Not this." He looked down at his belly, at the swell beneath the water. "Not them."
"Then why?" Katsuki's voice cracked, broke open. "Why'd you have to have another one? Why wasn't I enough?"
The question hit like a physical blow. Izuku's hand trembled against his son's face, and he saw the raw, unguarded hurt in those red eyes—the thirteen-year-old boy who still needed his mommy, who was terrified of being replaced.
"Oh, baby boy." Izuku pulled him closer, wrapping his arms around Katsuki's broad shoulders, pressing their foreheads together. "You were always enough. You're still enough. This baby—" he took Katsuki's hand, guided it to his wet belly, "—this baby is going to love you too. Is going to look up to you. And I'm going to love you both, but different. You're my first. My first everything. No one takes that from you."
Katsuki pulled his hand back from Izuku's belly like the water had turned to acid. His face crumpled—not with anger, but with that raw, childish hurt that made him look thirteen again, small and scared in his mother's lap.
"Words." His voice cracked, pitched higher than before. "Just words, Mom. You sayin' I'm your favorite, you sayin' you won't let it have you—but it's in there. Growin'. Takin' space that was mine." He pressed his palm flat against Izuku's belly again, harder this time, and Izuku felt the baby shift beneath the pressure. "It kicked. It *kicked* when I touched you. Like it knows. Like it's already staking a claim."
Izuku's heart ached at the tremor in his son's voice. He cupped Katsuki's face in both hands, forcing those red eyes to meet his. "Kacchan. Baby boy. Look at me."
"Then prove it." Katsuki's lower lip jutted out, trembling. Fucking *pouting* like he was ten years old and being asked to share his favorite toy. "How am I supposed to take your word for it when you're carryin' it? When it's *inside* you? You let me fuck your womb yesterday—you let me cum inside you over and over—but it's still in there. And you expect me to believe you're mine?"
Izuku didn't flinch. Didn't waver. He held his son's gaze and let the question settle into his bones, feeling the weight of it, the legitimacy of Katsuki's fear. "Then tell me what you need, baby boy. What can I do to make you feel assured? I'll do anything. *Anything.* You know I will."
Katsuki's breath hitched. His fingers curled against Izuku's belly, nails pressing crescents into the water-slick skin. "Anything?"
"Anything."
The word hung between them, steam curling around it. Katsuki's eyes searched Izuku's face—looking for hesitation, for the lie that would break him. He didn't find it.
Katsuki's crimson eyes bored into him, searching, measuring, weighing the weight of that single word. Izuku held still beneath the scrutiny, steam curling around his shoulders, his pregnant belly rising and falling with each slow breath. He watched his son's throat work, watched the boy swallow hard, watched the war play out across that sharp, handsome face—the desperate child fighting the hungry young man.
"Give me something," Katsuki finally said, his voice rough, cracked at the edges. "Something nobody else has. Not Dad. Not—" He gestured at Izuku's belly with a jerky motion. "Not *it*. Something that's just mine. A part of you that only I get to have."
Izuku's heart stuttered in his chest. He felt the heat rise to his cheeks, felt the sudden slick pulse between his thighs beneath the churning water. His mind raced through every possibility, every inch of his body, every secret he'd kept tucked away like a treasure waiting to be claimed. And then he smiled—soft, knowing, a little breathless.
"I have something, baby boy." Izuku pushed himself up, water streaming from his shoulders, his belly, his thick thighs. He settled on the edge of the tub, the cool air hitting his wet skin, making him shiver. He spread his legs wide, the water lapping at his thighs, and reached behind him with both hands. "Something I've never given anyone. Not even your father."
Katsuki's breath caught audibly. He shifted forward in the water, his eyes locked on Izuku's hands as they gripped his own ass cheeks, pulling them apart. Izuku arched his back slightly, presenting himself—his pussy, still swollen and pink from yesterday's marathon, and below it, the tight, untouched rosebud of his asshole.
"Do you see it, Kacchan?" Izuku's voice dropped to a whisper, reverent and trembling. "The little hole below my pussy?"
"Your... asshole?" Katsuki's voice cracked, pitched somewhere between disbelief and raw hunger.
Izuku nodded, a tear slipping down his cheek—whether from vulnerability or relief, he couldn't tell. "No one has ever been inside here, baby boy. No one's ever fucked my asshole. Not a finger, not a tongue, not a cock." He held his son's gaze, letting the confession hang between them, letting the enormity of it settle. "It's only for you, Kacchan. Only your cock gets to be inside me there. Only you get to claim this part of Mommy."
The silence stretched, steam curling around them like a benediction. Katsuki's hands trembled where they gripped the edge of the tub, his knuckles white, his cock already thickening beneath the water. His voice, when it came, was small—the voice of a boy who had just been given the universe.
"Mommy..."
Izuku opened his arms, and Katsuki surged forward, water splashing over the edge of the tub, pressing his wet, trembling body against his mother's. Izuku held him, cradling his head against his chest, feeling the desperate thrum of his son's heartbeat against his own.
"It's yours, baby boy. Every part of me is yours."
Izuku's breath hitched as he guided Katsuki's hand through the churning water, their fingers intertwined, bubbles breaking around them. He brought his son's hand between his thighs, pressing Katsuki's index finger against the tight, untouched ring of muscle. "Like this, baby boy. Slow. Let me feel you."
Katsuki's finger trembled against him, hesitant, reverent. "I don't wanna hurt you, Mommy."
"You won't." Izuku's voice came out thick, throaty. He pressed Katsuki's fingertip harder against the entrance, feeling the initial resistance, the way his body clenched instinctively. "Just a little pressure. Not pushing yet. Let me get used to you touching me there."
His hand stayed wrapped around Katsuki's, guiding, teaching. The water sloshed gently around them, steam curling into his lungs with every shallow breath. He could feel his son's pulse, rabbit-fast, thrumming through the fingers pressed against his most intimate flesh.
"Feel that resistance?" Izuku whispered, his free hand coming up to cup Katsuki's jaw. "That's your territory, Kacchan. No one's ever claimed it. It doesn't know how to open yet." He pressed Katsuki's finger just slightly, feeling the muscle give a fraction. "But it'll learn. For you. It'll learn to take you."
Katsuki made a sound—broken, desperate, somewhere between a whimper and a sob. "Mommy..."
"Shh. I know, baby boy." Izuku's thumb traced the webbing of Katsuki's hand, then guided his finger in a slow, circular motion against the entrance. "Just circles. Let it relax. Let it know it's you." He watched Katsuki's face, the way those crimson eyes had gone glassy, pupils blown wide, lips parted. "How does it feel against your fingertip?"
"Tight. Hot." Katsuki's voice cracked. "Like it's... like it's kissing me."
Izuku's cunt clenched, heat flooding through him at his son's words. "Good boy. That's exactly what it's doing. It's saying hello." He pressed Katsuki's finger harder, feeling the ring of muscle begin to yield, just the tip sinking in. "Push, sweetheart. Just the tip. I want to feel you inside me there."
Katsuki's finger breached him, the knuckle sliding past the tight ring, and Izuku's entire body shuddered. The sensation was foreign, overwhelming—the fullness of a finger in his asshole for the first time, claiming that forbidden territory. His thighs trembled against the water's current.
"Oh, fuck," Katsuki breathed, reverent. "Mommy, I'm... I'm inside you."
Izuku's vision blurred with tears. He pressed his forehead to Katsuki's, breathing ragged. "Yes, baby boy. You're inside me. Right where you belong." He held Katsuki's finger still, just there, letting the moment settle into his bones—this new frontier, this gift he'd held sacred his entire life, now given freely to his firstborn. "Now move. Show me you know how to claim what's yours."
Katsuki's finger was still buried inside him, barely past the first knuckle, and Izuku's entire world had narrowed to that single point of intrusion. The water churned around them, steam curling into his lungs, but all he could feel was the foreign pressure, the slight burn, the way his body kept clenching around his son's finger like it was trying to decide whether to push it out or pull it deeper.
"Another one, baby boy." Izuku's voice came out breathy, desperate. He pressed his forehead against Katsuki's, their wet lashes tangling. "Give Mommy another finger. I need to feel you stretch me."
Katsuki's hand trembled where it rested against Izuku's ass cheek. "I don't wanna hurt you—"
"You won't." Izuku reached down, catching Katsuki's wrist, guiding his middle finger to join the first. "I trust you, Kacchan. I trust you with my body. With every part of it." He pressed both of Katsuki's fingers against the tight ring of muscle, feeling the resistance, the way his body clenched instinctively. "Push. Slow. Let me feel you open me."
The pressure built as both fingertips pressed simultaneously against his entrance. Izuku's breath caught, his thighs trembling beneath the water. The ring of muscle gave slowly, reluctantly, and then both fingertips breached him at once. The stretch was sharp, overwhelming, a fullness he'd never experienced. His cunt clenched involuntarily, slick heat flooding through him.
"Oh, fuck," Katsuki breathed, his voice reverent, broken. "Mommy, I'm... both of them are inside you."
Izuku's vision swam with tears. He wrapped his arms around Katsuki's neck, holding himself steady, feeling those two fingers buried deep in his virgin asshole. "Move them, baby boy. Slowly. Let me feel what it's like to be opened by you."
Katsuki's fingers began to move—tentative at first, shallow thrusts that barely withdrew before pressing back in. Each push sent a jolt through Izuku's body, a strange, foreign pleasure that built with each careful stroke. Izuku's hips began to rock, meeting Katsuki's thrusts, fucking himself onto his son's fingers.
"Yes," Izuku moaned, his voice wrecked and wanton. "Yes, baby boy, right there. That feels so good. You're making Mommy's ass feel so good." He rocked harder, taking those fingers deeper, feeling the stretch intensify with each push. "More, Kacchan. A third. Give Mommy a third finger."
Katsuki's third finger pressed against his entrance, the stretch immediate and overwhelming. Izuku cried out, his nails digging into Katsuki's shoulders as the ring of muscle struggled to accommodate the intrusion. But he didn't stop. He pushed back against it, taking that third finger inch by inch, feeling his body yield to his son's invasion.
"Fuck me, Kacchan." The words tumbled out, raw and shameless. "Please. I need your cock in my ass. I need you to claim this hole the way you claimed my cunt. Please, baby boy, please—"
Katsuki's fingers pulled out abruptly, leaving Izuku feeling empty and aching. The sudden loss drew a whimper from his throat, but before he could protest, he felt the thick, blunt head of Katsuki's cock pressing against his stretched entrance. The heat of it, the size of it—so much bigger than fingers. Izuku's breath caught, his body trembling with anticipation as Katsuki positioned himself, the head of his cock kissing the entrance to that sacred, untouched territory.
The head of Katsuki's cock pressed against Izuku's entrance, the heat of it searing through the steam-clung air. Izuku's breath caught, his body trembling on the edge of the tub, water still streaming down his thighs. He felt his son's hands grip his hips, fingers digging into the soft flesh, and then—no warning, no slow push—Katsuki slammed his entire length deep into Izuku's ass in one brutal, unforgiving thrust.
The scream that tore from Izuku's throat was nothing human. His eyes rolled back, his spine arching, his mouth open in a silent second scream that wouldn't come. The stretch was blinding, overwhelming, a fullness that split him open from the inside. His cunt clenched violently, and then he was squirting—a hot, liquid gush that sprayed across the tiles, splattering against the tub's edge, his own thighs slick with it. He couldn't stop it, couldn't control it, his body betraying him completely as wave after wave of cum shot from his cunt, driven by the impossible fullness of his son's cock buried in his ass.
"Fuck—Mommy—" Katsuki's voice was wrecked, reverent, his hands shaking where they gripped Izuku's hips. "You're so fucking tight—I can feel you clenching around me—"
Izuku couldn't form words. His head lolled back, his hands finding purchase on Katsuki's shoulders as he began to move—fucking himself back onto his son's cock, using it like a toy, like a dildo made just for him. Each thrust drove that thick length deeper, the stretch burning, perfect, and his cunt responded by squirting again, a hot stream that painted the floor beneath them. "Yes, yes, yes—" The word tumbled out, broken, desperate. "Fuck mommy's ass, Kacchan. Fuck it like you mean it. Fuck it like an animal—"
Katsuki's composure shattered. His hands moved from Izuku's hips to his waist, yanking him harder onto his cock with each thrust, the slap of skin against skin echoing off the tile walls. The water in the tub churned violently, splashing over the edge as Katsuki drove into him, each stroke deeper than the last, claiming that untouched territory with savage intensity. "You wanted this," Katsuki growled, his voice low and broken. "You wanted me to fuck your ass, Mommy. You wanted me to claim it—"
"Yes—" Izuku's voice came out a sob, his body rocking with each brutal thrust. His cunt kept releasing, squirting in rhythmic pulses that matched Katsuki's fucking, soaking his thighs, the tub, the floor. He couldn't stop, didn't want to stop. "Claim it, baby boy. Claim your mommy's ass. Make it yours—"
Katsuki leaned forward, pressing chest to chest, his mouth finding Izuku's ear. "You're never gonna let anyone else fuck this hole." It wasn't a question. "This is mine. Only mine. Say it."
"Yours—" Izuku gasped, his voice breaking on the word. "Only yours, Kacchan. Only your cock—only your—" He couldn't finish, his body convulsing as another orgasm ripped through him, his cunt squirting again, his ass clenching around Katsuki's cock like it was trying to milk him dry.
Katsuki's rhythm grew frantic, animalistic, his hips slamming against Izuku's ass with a ferocity that made the tub shake. "I'm gonna fill you up, Mommy. I'm gonna cum so deep in your ass that you'll feel it for days." His voice cracked, the age regression bleeding through. "Every time you sit down, you're gonna feel my cum dripping out of you. You're gonna remember who owns this hole."
Izuku's vision went white. His body surrendered completely, his ass clenching around Katsuki's cock as he felt his son's climax—hot, thick, endless—flooding into him. The sensation pushed him over the edge one last time, his cunt releasing in a final, violent squirt that soaked the tiles in a widening pool. He collapsed backwards, catching himself on the tub's edge, his body trembling, his ass still clenching around Katsuki's cock as the last spurts of cum filled him.
Izuku's arms were already lifting before the thought finished forming, slick with bathwater and trembling from the aftershocks. He wrapped them around Katsuki's neck, pulling himself up from the collapsed sprawl against the tub's edge, his ass still clenching around the thick, softening length of his son's cock. The movement made Katsuki's spent flesh shift inside him, and Izuku's breath caught—a small, helpless sound against Katsuki's throat.
"Don't pull out yet," Izuku whispered, his lips brushing the hinge of Katsuki's jaw. "Stay inside Mommy. Just a little longer."
Katsuki's hands found Izuku's waist beneath the water, fingers pressing into the swell of his hips. "Mommy—"
Izuku kissed him. Not gently. Not like a mother soothing a child. He kissed Katsuki with the desperate, hungry mouth of someone who'd discovered a new organ and couldn't stop touching it. His tongue pushed past Katsuki's lips, tasting the ghost of soap and the salt of his son's spit, and he moaned into that kiss like it was feeding him something he'd been starving for his entire life.
When he pulled back, Katsuki's crimson eyes were glassy, pupils blown so wide they'd swallowed the red. Izuku cupped his son's face in both hands, thumbs tracing the sharp cut of his cheekbones. "Kacchan," he breathed. "Baby boy. Mommy needs to tell you something." He pressed his forehead to Katsuki's, their wet lashes tangling. "I'm addicted to you now. Do you understand? Your cock in Mommy's ass—it's all I'm going to think about. All day. Every day."
Katsuki's breath stuttered. "Mommy, I—"
"Shh." Izuku kissed the corner of his mouth, then the other, then the bridge of his nose. "You made Mommy feel so good, Kacchan. So fucking good. I didn't know it could feel like that. I didn't know my body could do that." He shifted his hips, a tiny, deliberate movement that made Katsuki's cock twitch inside him, and the sensation drew a broken whimper from his throat. "I want you to fuck my ass every day. Every morning. Every night. Whenever you want. Whenever you need." His voice cracked. "Please. Please, baby boy. Don't make Mommy wait."
"You're begging," Katsuki said, and his voice was awed, almost reverent, the age regression bleeding through in the way his hands tightened on Izuku's hips. "Mommy's begging for my cock."
"Yes." The word came out a sob, raw and shameless. Izuku's whole body was trembling now, his cunt clenching and releasing in rhythmic pulses that had nothing to do with orgasm and everything to do with pure, animal need. "Yes, Kacchan, Mommy's begging. Mommy's a whore for you now. Only for you. Only for his firstborn." He kissed Katsuki again, biting his lower lip, pulling back just enough to speak against his mouth. "Tell me you'll do it. Tell me you'll keep fucking Mommy's ass. Tell me you'll make me cum over and over until I can't walk."
Katsuki's hands slid down to grip Izuku's ass cheeks beneath the water, fingers digging into the plush flesh with a possessiveness that made Izuku gasp. "I'll fuck you whenever I want," Katsuki said, his voice dropping into something dark and certain. "You're mine, Mommy. Every hole. Every part of you. And I'm gonna use you until you can't remember what it felt like before my cock was inside you."
"Promise me," Izuku begged, and he was crying now, tears cutting hot tracks down his cheeks, but he didn't care, didn't try to hide them. He ground his hips down, taking Katsuki's cock deeper, feeling the soft, spent flesh begin to stiffen again inside him. "Promise Mommy you'll fuck my ass every single day. Promise you'll make me squirt all over this tub, all over the bed, all over every surface in this house until I'm empty and shaking and still begging for more."
Katsuki kissed him. Hard. Deep. His tongue fucking into Izuku's mouth with the same brutal rhythm he'd used on his ass, and Izuku surrendered to it, let himself be consumed, let his son own every inch of his mouth the way he'd owned every inch of his body. When Katsuki broke the kiss, his voice was wrecked, a growl that vibrated against Izuku's lips. "I promise, Mommy. I'm gonna fuck your ass so much you won't even remember what it felt like before. You're gonna wake up with my cock inside you and fall asleep with my cum dripping out of you. Every day. Every night. Forever."
Izuku's cunt released in a sudden, violent gush, squirting hot and wet against Katsuki's belly beneath the churning water. He sobbed through it, his whole body convulsing, his ass clamping down on Katsuki's now-fully-hard cock like it was trying to pull him deeper. "Yes—yes—fuck—" The words tumbled out, broken and desperate. "That's what Mommy wants. That's all Mommy wants. Just you, Kacchan. Just your cock in my ass, making me cum, making me squirt, making me your whore. Every day. Forever."
The words kept falling out of Izuku's mouth like he'd sprung a leak somewhere deep inside himself, somewhere that had been holding pressure for years and had finally burst. "Please, Kacchan, please—Mommy needs it so bad, needs your cock, needs you to keep making me feel good, keep making me squirt—" His hips were still grinding, still fucking himself back onto Katsuki's cock even though he'd just come, even though his cunt was still pulsing from the last release. "Don't stop, baby boy, don't ever stop—"
"Mommy," Katsuki breathed, and his voice was wrecked, awed, like he was watching something holy. His hands tightened on Izuku's ass cheeks beneath the water, fingers sinking into the plush flesh. "I'm not stopping. I told you. I'm gonna fuck you forever." He pulled Izuku down harder onto his cock, grinding deep, and Izuku's mouth fell open on a sound that wasn't even a word anymore—just a raw, animal keen that echoed off the bathroom tiles.
"That's it, baby boy, that's—yes, yes, right there—" Izuku's head lolled forward, his forehead pressing against Katsuki's, his breath coming in hot, wet gasps that mingled with the steam. His whole body was shaking, his cunt clenching and releasing in rhythmic flutters that had nothing to do with orgasm and everything to do with how fucking good it felt to be filled. "Mommy's such a whore for you, Kacchan. Such a desperate, needy whore. Just want your cock, just want you to keep fucking me, keep making me squirt—"
"You're so wet," Katsuki said, and his voice was almost reverent, almost disbelieving. His hips rolled up in a slow, grinding thrust that made Izuku's breath stutter. "I can feel it, Mommy. Every time you clench around me, your cunt just—it just keeps gushing. You're soaking my lap. You're soaking the whole fucking tub."
"I can't help it," Izuku sobbed, and he was crying again, tears cutting hot tracks down his cheeks, but he was also laughing, a broken, delirious sound. "I can't stop, Kacchan. My body just—it just—every time you move inside me, every time you fill me up, I just—" His cunt released again, a hot, liquid pulse that had him gasping, his nails digging into Katsuki's shoulders. "See? See? I can't control it. Mommy can't control anything when you're inside him."
Katsuki kissed him then, hard and hungry, swallowing Izuku's sobs like they were something precious. His tongue fucked into Izuku's mouth with the same brutal rhythm he was using on his ass, and Izuku surrendered to it, let himself be consumed, let his son own every inch of his mouth the way he'd owned every inch of his body. When Katsuki broke the kiss, his voice was a growl. "Good. I don't want you to control it. I want you to squirt all over me every time I fuck you. I want to feel it. I want to smell it. I want to taste it."
"Then make me," Izuku heard himself say, and the words came out like a challenge, like a dare, his voice dropping into something raw and desperate. "Make Mommy squirt again, Kacchan. Please. Please, baby boy. I know you can. I know you can keep making me cum until I can't even remember my own name. Please—" He was babbling now, the words tumbling out in a broken, desperate stream. "Please make Mommy squirt. Please make Mommy cum. Please fuck my ass until I can't walk. Please, please, please—"
"Fuck," Katsuki breathed, and his hips snapped up in a sharp, brutal thrust that drove his cock deeper than Izuku had ever felt it. Izuku screamed, his back arching, his cunt releasing in a sudden, violent gush that sprayed hot and wet against Katsuki's belly, against the churning water, against the edge of the tub. The sound that came out of him was nothing human—a raw, animal keen that seemed to go on and on, his body convulsing, his ass clamping down on Katsuki's cock like it was trying to pull him into his fucking soul.
"That's it," Katsuki growled, and he was fucking into Izuku now with short, sharp thrusts, each one driving another pulse of liquid from his cunt. "That's it, Mommy. Squirt for me. Keep squirting. I want to feel it. I want to feel you lose control." His hands were everywhere—gripping Izuku's hips, sliding up his back, fisting in his wet green curls and yanking his head back so he could watch Izuku's face as he came apart. "You're so fucking beautiful when you squirt, Mommy. So fucking perfect."
Izuku couldn't form words anymore. His mouth was open, his eyes rolled back, his whole body shaking with the force of his release. His cunt kept pulsing, kept gushing, driven by the relentless rhythm of Katsuki's cock in his ass, and he was lost in it, completely fucking lost, nothing but sensation and need and the broken, desperate chant of more, more, more that was running through his head like a prayer.
"I love making you feel good," Katsuki said, and his voice was quiet now, almost wondering, even as his hips kept driving into Izuku with that same brutal rhythm. "I didn't know—I didn't know it would feel like this. Making Mommy squirt. Making Mommy cum over and over. It feels—" He broke off, his breath hitching, his hands tightening on Izuku's hips. "It feels better than anything. Better than cumming. Better than breathing."
"Then don't stop," Izuku managed, his voice coming out wrecked and broken, barely a whisper. His hands found Katsuki's face, cradling his jaw, thumbs tracing the sharp cut of his cheekbones. "Don't ever stop, baby boy. Keep making Mommy feel good. Keep making Mommy squirt. Keep—" His breath caught on a sob. "Keep using me, Kacchan. Use me however you want. Mommy's body is yours. Every hole. Every inch. Just—please—"
Katsuki surged up and kissed him again, and Izuku felt his son's cock throb inside him, felt the heat of it, the life of it, the promise of it. He knew Katsuki was close—could feel it in the way his rhythm was starting to stutter, in the way his hands were gripping tighter, in the desperate, broken sounds he was making against Izuku's mouth. And Izuku wanted it. Wanted Katsuki to fill him up again. Wanted to feel his son's cum flooding his ass, marking him, claiming him all over again.
But Katsuki didn't cum. Not yet. His hips slowed, stilled, his cock buried deep in Izuku's ass while his hands slid up Izuku's back, cradling him like something breakable. His crimson eyes searched Izuku's face, and there was something in them—something young, something desperate—that made Izuku's breath catch for a reason that had nothing to do with pleasure.
"Mommy," Katsuki whispered, and his voice cracked on the word, the age regression bleeding through. "You're shaking."
"I know." Izuku's hands found Katsuki's face again, cradling his jaw, thumbs tracing the sharp cut of his cheekbones. His whole body was trembling, little aftershock tremors that wouldn't stop, his cunt still pulsing in slow, rhythmic clenches. "Mommy's just—Mommy's feeling so good, baby boy. So fucking good." He kissed the corner of Katsuki's mouth, soft and reverent. "Better than anything. Better than I ever—"
His voice died in his throat. A thought was forming, something dark and impossible, rising out of the pleasure-drunk haze like a body surfacing from deep water. Izuku felt it coming and couldn't stop it, couldn't stop the words that were already shaping themselves on his tongue.
"Kacchan," he breathed. "Can Mommy tell you something? Something—" He broke off, his breath stuttering. His cunt clenched hard around nothing, a sudden, violent pulse that had him gasping. "Something dirty."
"Tell me." Katsuki's voice was rough, his hands tightening on Izuku's hips. "Tell me, Mommy. Tell me everything."
Izuku pressed his forehead to Katsuki's, their wet lashes tangling. The fantasy bloomed behind his eyes, vivid and obscene and so fucking hot that his cunt released in a sudden gush, soaking Katsuki's lap beneath the churning water. "I want—" He swallowed hard, his voice coming out wrecked. "When the baby comes. When Mommy's in labor. I want you to fuck my ass while it happens."
Katsuki's breath stuttered. His cock throbbed inside Izuku, a sharp, involuntary pulse. "Mommy—"
"I want your cock in my ass while I push your little brother out of my cunt," Izuku whispered, and the words came out raw and desperate, a confession he hadn't known was living inside him. His hips ground down, taking Katsuki deeper, and the sensation made his eyes roll back. "I want to feel you filling me up while I'm pushing him out. I want to squirt all over the delivery table while your cock is in my ass. I want—" His voice cracked on a sob. "I want the doctors to see. I want the nurses to see. I want your father to see what a whore his wife is for his firstborn."
"Fuck," Katsuki breathed, and his hips snapped up in a sharp, involuntary thrust that drove his cock deeper and made Izuku scream. "Fuck, Mommy, you want—you want me to fuck you while you're having the baby? In front of everyone?"
"Yes." The word came out a sob, raw and shameless. Izuku's whole body was shaking now, his cunt releasing in rhythmic pulses that had nothing to do with orgasm and everything to do with how devastatingly hot the fantasy was. "I want them to see Mommy squirting like a fountain while his firstborn's cock is buried in his ass. I want them to see what a desperate whore I am for you, Kacchan. I want them to see—" He broke off, gasping, his nails digging into Katsuki's shoulders. "I want them to see the head of your little brother coming out of my cunt while you're still inside me. I want to feel you both at the same time. I want to feel your cock in my ass and his head stretching my pussy and I want to cum, Kacchan, I want to cum so hard while I push him out, I want to squirt all over the delivery table, all over the doctor's hands, all over—"
His voice broke completely, dissolving into a raw, animal keen as another orgasm ripped through him. His cunt released in a sudden, violent gush, spraying hot and wet against Katsuki's belly, and his ass clamped down on Katsuki's cock with a ferocity that made them both gasp. Izuku felt himself spiraling, felt the fantasy consuming him whole, and he couldn't stop, couldn't stop talking, couldn't stop the words that were pouring out of him like the liquid that wouldn't stop gushing from his cunt.
Katsuki's hands found Izuku's face, cradling it with a gentleness that made the air between them go still. His crimson eyes were wild, pupils blown wide, but his voice came out low and steady—a promise, not a plea. "I'll do it, Mommy. I'll fuck you in front of everyone. I'll fuck your ass while you push him out. I'll make you squirt all over the doctors, all over the nurses, all over Dad if he's there. I don't care who sees. I want them to see."
"Kacchan—" Izuku's voice broke on a sob, his cunt releasing in a hot, helpless pulse that had nothing to do with orgasm and everything to do with how fucking much he needed to hear those words.
"I'm serious." Katsuki's grip tightened, his thumbs pressing into the soft flesh of Izuku's cheeks. "I'll fuck you the whole time. Every contraction. Every push. My cock in your ass while you bring my little brother into the world. And I'll keep making you squirt, Mommy. I'll make you squirt so much they'll have to mop the floor. I'll make you squirt until you're empty and shaking and still begging for more."
Izuku couldn't speak. Couldn't breathe. The fantasy had him by the throat, and Katsuki's voice was feeding it, stoking it into something so hot and devastating that his cunt just kept gushing, rhythmic pulses of liquid that soaked Katsuki's lap and disappeared into the churning water. His ass clenched down on Katsuki's cock, and the sensation made them both gasp.
"You want that, don't you?" Katsuki's voice dropped, rough and reverent. His hips rolled up, a slow, grinding thrust that made Izuku's eyes roll back. "You want everyone to see what a whore my mommy is for me. You want them to see you squirting like a fountain while your firstborn's cock is buried in your ass. You want them to know that you're mine. That your body is mine. That your cunt only does this for me."
"Yes—yes—fuck—" Izuku's hands fisted in Katsuki's wet hair, yanking his head back so he could look into his son's eyes. His whole body was shaking, trembling on the edge of something enormous, and he could feel Katsuki's cock throbbing inside him, feel the heat of it, the life of it. "Mommy wants that so bad, Kacchan. Wants everyone to see. Wants them to know—" His voice cracked. "Wants them to know I belong to you."
"You do." Katsuki's hips snapped up, driving his cock deeper, and Izuku screamed. "You belong to me, Mommy. Every hole. Every inch. Every squirt. Every orgasm. You're mine. And I'm gonna prove it. I'm gonna fuck you in front of everyone, and when that baby comes out, he's gonna come out knowing that his mommy is his big brother's whore."
The words hit Izuku like a physical blow, and his cunt released in a sudden, violent gush that sprayed hot and wet against Katsuki's belly, against the churning water, against the edge of the tub. He felt Katsuki's cock throb inside him, felt the sharp, involuntary pulse that meant his son was close, and he ground his hips down, taking him deeper, wanting to feel him come apart.
"Cum inside me, Kacchan," Izuku breathed, and his voice came out wrecked and desperate, a sob and a prayer tangled together. "Cum in Mommy's ass while I squirt all over you. Fill me up, baby boy. Make me yours all over again. Please—" He kissed Katsuki's forehead, his temple, the corner of his mouth. "Please cum for Mommy. Please."
Katsuki's rhythm shattered. His hips snapped up in short, brutal thrusts, and Izuku felt his son's cock pulse, felt the hot flood of cum filling his ass, and the sensation pushed him over the edge. His cunt released in a massive, violent gush, spraying everywhere—Katsuki's belly, the churning water, the edge of the tub, the bathroom tile—and Izuku screamed, his back arching, his whole body convulsing as the orgasm ripped through him.
"Mommy—Mommy—" Katsuki's voice was a broken chant, his eyes rolled back, his body trembling as he pumped his cum deep into Izuku's ass. His hands were everywhere—gripping Izuku's hips, sliding up his back, fisting in his wet hair—and Izuku held him through it, cradling his son's head against his chest as they came apart together.
The orgasm seemed to go on forever, wave after wave, Izuku's cunt pulsing in rhythmic gushes that wouldn't stop, his ass clenching down on Katsuki's cock like it was trying to pull every last drop of cum out of him. And when it finally began to fade, when the last tremors rippled through his body and the last pulse of liquid released from his cunt, Izuku collapsed forward, his forehead pressing against Katsuki's, their breath coming in hot, wet gasps that mingled with the steam.
They didn't move. Didn't speak. Just held each other in the warm, churning water, Katsuki's cock still buried in Izuku's ass, Izuku's arms wrapped tight around his son's shoulders. The bathroom was quiet now except for the low hum of the jets and the soft, ragged sound of their breathing, and Izuku felt something settle in his chest—something deep and certain and terrifying in its intensity.