Chapter 7: Overstimulation
The chaotic warmth of the living room felt like a different lifetime. Upstairs, in the sanctuary of Izuku’s riotous bedroom, the only sound was the low hum of the city through the slightly ajar window and Kaito’s shaky, hitched breathing. The air smelled of Izuku’s apple blossom shampoo, fabric softener, and the sharp, clean scent of sex.
Kaito was broken open.
He lay on his side, naked, curled in on himself like a question mark, his head a heavy, warm weight in Izuku’s lap. The patchwork quilt was a rumpled sea of color beneath them. Every muscle in his body felt liquid, unstrung. Tremors, fine and constant, ran through him—a physiological aftershock from the public, impossible climax on the couch and the frantic, silent cleanup that followed. Shame, exhilaration, and a deep, submissive ache warred inside him, leaving him raw.
Izuku was naked too, sitting propped against the carved wooden headboard, a vision of casual ownership. The soft light from the bedside lamp gilded the curves of his breasts, the pale swell of his stomach, the delicious junction of his thighs. One hand was idly combing through Kaito’s sweaty brown waves, the touch tender, almost maternal. The other hand, however, was engaged in a very different act.
It was wrapped around Kaito’s soft, oversensitive cock.
Izuku had started almost as soon as the bedroom door clicked shut. No words, just a push onto the bed, a stripping of clothes that felt more like a ritual than foreplay, and then Izuku arranging him just so. He’d been jerking him off for what felt like an eternity. Not to arousal, but through it, past it, into a realm of pure, shuddering sensation.
“There you go,” Izuku murmured, his voice a low, honeyed rasp. His fist moved with a lazy, relentless rhythm, up and down the spent length. It wasn’t hard, wasn’t fast. It was persistent. Inescapable. “Just let it happen, baby. You’re doing so good for me.”
Kaito whimpered. A full-body flinch traveled through him. His cock, utterly spent, was a live wire of agony and faint, confusing pleasure. It was too much. It was everything. Tears, hot and silent, welled in his eyes and tracked sideways across the bridge of his nose, soaking into Izuku’s thigh.
“Shhh,” Izuku soothed, his stroking hand never ceasing. His other hand left Kaito’s hair and drifted down, palming the firm curve of his ass, rubbing slow, possessive circles. “My big, strong scientist. My gorgeous boy. Crying in my lap because my hand feels too good. Isn’t that something?”
“Iz…Izuku, please,” Kaito choked out, the words slurred, thick with tears. “I can’t… it’s too… stop.”
“Stop?” Izuku’s tone was one of gentle, feigned confusion. His hand kept moving, up, down, a slick, maddening slide. “But you’re not even hard, Kaito. How can it be too much if you’re not even hard? It’s just my hand. Just touching you. After what you did to me downstairs? After you filled me up in front of my whole family?” He leaned down, his lips brushing the shell of Kaito’s ear. “You don’t get to beg off that easy.”
A fresh wave of sobs wracked Kaito. He pressed his face harder into Izuku’s thigh, seeking an anchor in the soft skin. The memories flashed—the daring look in Izuku’s eyes, the smirk on Katsuki’s face, the profound, weary acceptance on Shouta’s as he turned up the volume. He’d come apart in a room full of people he loved and respected. The vulnerability of it was terrifying. And Izuku owned every second of it.
“You liked it,” Izuku whispered, reading his tremors like a book. “You liked them knowing. You liked Daddy knowing. You came so deep inside me you saw stars, and you liked that they were all right there.” His stroking shifted, his grip tightening just a fraction, focusing on the hypersensitive head, rubbing his thumb over the slit where a last, pathetic drop of moisture gathered. “Admit it.”
“I… I…” Kaito couldn’t form the thought. His hips gave a tiny, involuntary jerk, a feeble attempt to escape the sensation that only served to push his cock more firmly into Izuku’s relentless hand.
“You did,” Izuku affirmed, as if settling a scientific debate. “And now you’re mine. All mine. And I want to see how long I can make you feel this. Every second of it.”
The clock on the bedside table ticked. The city hummed. And Izuku’s hand worked him.
Time lost meaning. It stretched and compressed into a single point of agonized sensitivity. Kaito cried until his throat was raw, silent, open-mouthed sobs that shook his shoulders. He begged into Izuku’s skin, please, please, I’m sorry, I’ll be good, just stop, just let me breathe. Izuku answered only with sweet, filthy praise and the unceasing motion of his hand.
“Look at you,” Izuku cooed, his voice dripping with affection and dark delight. “A sobbing, shaking mess. All because of my little hand. My poor baby. Does it hurt? It shouldn’t hurt. It should just feel… intense. Everything with me is intense, isn’t it? You love it. Your body loves it. See?”
He sped up his strokes, just for a dozen brutal revolutions. Kaito shrieked, a broken, airless sound, his back arching off the bed. A flash of something—not pleasure, not pain, but a white-hot neural scream—lit up his spine. His soft cock twitched pathetically in Izuku’s grasp.
Izuku slowed again, returning to that torturous, lazy pace. “There we go. Just a little spark. You’ve got more in you. I know you do.”
His hand on Kaito’s ass slid lower, dipping into the cleft, teasing the tight, clenched ring of muscle there. Kaito jerked as if electrocuted. “No, no, no, not there, please, Izuku, I can’t, I’ll break—”
“You won’t break,” Izuku said, his voice firm now, the sweetness edged with steel. “You’re my strong man. You took me in an alley against a wall. You fucked me on my daddy’s couch. You can take my fingers.” As if to punctuate his point, he spat, once, twice, into his hand, the sound crude and wet in the quiet room. He slicked his middle finger with it and returned it to Kaito’s entrance, rubbing insistently. “This is mine, too. Everything is. Relax.”
The command, coupled with the overwhelming stimulus from the front, broke the last of Kaito’s resistance. A profound, shuddering relaxation, the surrender of total exhaustion, washed through him. His body went limp. The tension in that tight muscle released.
Izuku’s finger pushed inside, just to the first knuckle.
Kaito wailed. It was a full-throated, ragged cry of overstimulation, a sound he didn’t know he could make. It was too much. It was a violation so complete it circled back to a kind of sacred intimacy. He was being opened, claimed, in his most vulnerable state.
“Good boy,” Izuku breathed, his own composure slipping for a heartbeat. His voice was thick with arousal. He pushed his finger in deeper, curling it slightly, a gentle, searching pressure. His other hand continued its mechanical, devastating strokes. “Such a good boy for me. Taking it. Feeling it. This is what you wanted, isn’t it? When you let me lead you into that alley? This is where I was always taking you.”
He was right. Kaito knew it in his marrow, in his weeping, oversensitive cock, in the slow, full ache of his ass around Izuku’s finger. This was the destination. This utter unraveling. This total loss of control, gifted willingly to the person he trusted most in the world.
Izuku began to fuck him slowly with his finger, a shallow, rhythmic push and pull that synced with the strokes on his cock. The dual assault was catastrophic. Kaito’s cries dissolved into continuous, hiccupping whimpers. He was floating, dissociated, a creature made only of feeling. The room, the light, the posters on the wall—all of it blurred into a watercolor smear.
“I could do this all night,” Izuku mused, his voice a dreamy whisper. He added a second finger, stretching him, the burn a bright, clarifying counterpoint to the dull, throbbing agony in his front. “I love the sounds you make. I love how you shake. I love knowing I’m the only one who gets to see you like this. My beautiful, brilliant Kaito. Reduced to a crying, coming mess in my lap.”
The word “coming” triggered something. A weak, desperate throb in his cock. A spasm deep inside where Izuku’s fingers worked. He wasn’t hard, not truly, but his body was trying, against all logic and exhaustion, to respond.
“You want to come again?” Izuku asked, wonder in his tone. “You think you can? Let’s see.”
His hand on Kaito’s cock became purposeful, tighter, faster. His fingers inside him crooked, searching, and found a spot that made Kaito’s vision flash white. He scissored them, stretching him open, rubbing that brutal, brilliant patch of nerves in time with his strokes.
It wasn’t pleasure. It was beyond pleasure. It was a systemic overload. Kaito’s body bowed, tense as a drawn bowstring. A raw, guttural noise was torn from his throat, a sound of pure, unadulterated release that had nothing to do with orgasm and everything to do with utter surrender. Clear fluid, not semen, spilled from the tip of his cock in weak, pulsing spurts, a dry, agonizing climax that felt like his soul was being wrung out.
Izuku didn’t stop. He milked him through it, his hand a relentless engine, his fingers buried deep inside him, holding him through the convulsions that looked more like seizures than pleasure.
Finally, after an eternity where Kaito truly believed he might die from the sensation, Izuku stilled.
He slowly, carefully, withdrew his fingers. He released Kaito’s spent, dripping cock. The sudden absence of touch was its own shock, a vacuum of feeling that left Kaito gasping on the edge of a void.
For a long moment, there was only the sound of Kaito’s ragged, weeping breaths.
Then, Izuku moved. Gently, he shifted Kaito’s boneless body, turning him onto his back, arranging him so his head was still cradled in his lap. Izuku looked down at him, his wine-red eyes soft, his expression one of devastating tenderness. He wiped at the tears and sweat on Kaito’s face with his own clean hand.
“There,” Izuku whispered. He leaned down and pressed a soft, lingering kiss to Kaito’s trembling lips. “All done. You were perfect.”
Kaito could only stare up at him, his eyes wide, wrecked, full of a love so profound it ached. He tried to speak, but only a broken sigh emerged.
Izuku smiled, a real smile, not a smirk. He reached over to the bedside table, grabbed a water bottle, and brought the straw to Kaito’s lips. “Drink. Small sips.”
Kaito obeyed, the cool water a blessing on his raw throat. Izuku made him drink half the bottle, then set it aside. He then pulled the rumpled quilt up over both of them, creating a warm, cocooning darkness. He slid down the headboard, wrapping himself around Kaito, spooning him from behind, his front pressed to Kaito’s back, his arms holding him close. His hand splayed possessively over Kaito’s stomach.
“Go to sleep,” Izuku murmured into the nape of his neck, his breath warm. “I’ve got you.”
The last of the tremors began to subside, soothed by the solid, warm weight of Izuku’s body. The overstimulation faded into a deep, full-body hum, a cellular memory of the ordeal. In its place spread a fatigue so total it felt like sinking into warm earth.
As Kaito hovered on the edge of unconsciousness, Izuku’s voice came again, a soft, final murmur in the dark.
“Tomorrow, you’re gonna help me figure out how to get cum stains out of microfiber. And you’re gonna look my daddy in the eye at breakfast.” A pause. A kiss on his shoulder. “And you’re gonna love every second of that, too.”
And Kaito, in the deepest, most truthful part of his shattered, reassembling heart, knew that he would.