Chapter 4: Triple Overstimulation
The world swam back into focus in fragments.
The first was the scent—musk, sex, and that sharp, clean edge of Katsuki’s cologne, now mingled with sweat. The second was the weight. Katsuki’s arm was thrown heavily across her waist, his breathing deep and even against her back. Izuku was curled against her front, his face buried in her hair, one hand resting over Katsuki’s on her hip. She was sandwiched between them, a sweat-slick, exhausted center.
Moonlight still cut through the blinds, painting silver stripes across Katsuki’s discarded shirt on the floor and over the half-eaten bowl of ramen on the nightstand. Izuku’s fairy lights were a soft, warm glow from his side of the room, casting their tangled limbs in gentle relief.
Her body felt liquid, used, profoundly relaxed. And yet, a thread of anxiety knotted in her stomach. The silence was loud. What happened now? Was this a one-time, heat-of-the-moment thing? A mistake they’d awkwardly brush past in the morning?
As if sensing her spiral, Izuku stirred. He pressed a soft kiss to her temple. “Hey.”
The simple word, filled with such tender warmth, made her throat tighten. She couldn’t speak. She just nudged her head back against his lips.
Katsuki grunted, his arm tightening around her. “Your brain is fucking loud. Go to sleep.”
“I’m not tired,” she whispered, though her limbs were lead.
“‘Course you’re not,” he muttered, his voice rough with sleep. He shifted, rolling onto his back. The loss of his heat against her spine made her shiver. “Dehydrated, maybe. Deku.”
Izuku was already moving, untangling himself with a fluid ease. “On it.” He slipped out of bed, naked and unselfconscious, padding out to the kitchen.
The space he left felt cavernous. Sophia lay on her back, staring at the ceiling. Katsuki’s hand found hers on the sheet, his fingers lacing through hers with a startling possessiveness. He didn’t look at her. He just held on, his thumb brushing over her knuckles.
Izuku returned with three glasses of water. He handed one to Sophia, another to Katsuki, then climbed back in, sitting up against the headboard. He sipped his water, watching her over the rim.
She drank greedily, the cold water a shock to her system. It grounded her.
“So,” Izuku said, setting his glass down. “That was…”
“Intense,” Sophia finished, her voice small.
Katsuki barked a short laugh. “Understatement of the fucking century.” He sat up too, running a hand through his spiky hair. He looked at her, his red eyes assessing in the dim light. “You good?”
The question was blunt, but the intent behind it wasn’t. It wasn’t just about physical well-being.
She nodded. “Yeah. More than good.”
A ghost of a smirk touched his lips. “Yeah, we noticed.” He nodded toward her. “You’re gonna be sore tomorrow.”
“I don’t mind.”
Izuku reached out, tracing the Japanese characters for ‘courage’ inked on her thigh. “You were incredible,” he said, his voice soft with awe. “The way you… you just let go. It was beautiful.”
Heat flooded her cheeks. She looked away, focusing on the Bubbles tattoo on his own bicep, visible in the fairy light glow.
Katsuki’s hand left hers to cup her jaw, turning her face back to him. His touch was firm, demanding her attention. “None of that. Don’t you fucking hide now.” His thumb stroked her cheekbone. “You wanted this. We wanted it. That’s the whole story.”
“Is it?” she asked, the fear finally spilling out. “What about… after tonight?”
Izuku and Katsuki shared a look over her head—a silent, entire conversation passing between them in a split second. It was intimacy of a different kind, forged over a lifetime. Izuku gave a slight nod.
Katsuki’s gaze returned to her. “What about it? You live here. We see you every day. You think we’re gonna pretend this didn’t happen? That we don’t want to do it again?” He leaned closer, his voice dropping. “You heard me in the hallway. I don’t say shit I don’t mean.”
“We want you, Sophia,” Izuku said, his hand joining Katsuki’s on her face, his touch a soothing counterpoint to Katsuki’s intensity. “Not just… this. Although,” he added, a blush darkening his freckled cheeks, “definitely this. But you. If you want us.”
The knot in her stomach dissolved, replaced by a spreading warmth. “I do,” she breathed. “I really, really do.”
Katsuki’s answer was a kiss. It was slower than before, less about conquest and more about confirmation. His lips moved against hers with a deliberate, claiming tenderness. When he pulled back, his eyes were dark. “Good.”
Izuku kissed her then, sweet and deep, tasting of water and comfort. When they parted, he was smiling, a bright, genuine thing that lit up his whole face. “Okay.”
A comfortable quiet settled over them. Izuku slid back down, curling into her side. Katsuki remained sitting up, looking down at them both, his expression unreadable.
Then, his hand landed on her hip, his fingers splaying over the curve of her ass. “Turn over.”
The command was quiet, but absolute. It wasn’t rough, but it brooked no argument.
Her breath hitched. The languid calm of moments before evaporated, replaced by a fresh, eager tension. She glanced at Izuku. His eyes had darkened, his lips parting slightly. He gave another almost imperceptible nod.
Slowly, her heart beginning to pound again, Sophia rolled onto her stomach. The sheets were cool against her flushed skin. She felt exposed, vulnerable. The rose tattoo on her chest pressed into the mattress.
Katsuki’s palm settled heavily between her shoulder blades, holding her down. Not painfully, but with an undeniable pressure. “Stay.”
She heard Izuku move, felt the bed dip behind her. Then, his hands were on her, gentle but firm, spreading her cheeks apart. The cool air of the room kissed her most intimate skin, making her shiver.
“Look at this,” Katsuki murmured, his voice a low, appreciative rumble. “Look at this greedy little hole. Already twitching. You’re fucking insatiable.”
A hot wave of shame and desire washed over her. She buried her face in the pillow, a muffled sound escaping her.
“None of that,” Katsuki said again, his tone leaving no room for protest. He gripped her curls, not yanking, but with enough force to pull her head up and back. “You watch. You watch what he does to you.”
From this angle, she could see Izuku between her legs, his green eyes gleaming with focused intensity. He looked up at her, holding her gaze. Then he leaned in.
His tongue was a hot, flat stripe against her, lapping up the mess they’d made of her—his own release, Katsuki’s, her slick. The sound was obscenely wet in the quiet room. A ragged moan tore from her throat.
“That’s it,” Katsuki breathed above her, his hand still in her hair. “Listen to that. Hear how fucking wet you are for him.”
Izuku ate her with a single-minded devotion that made her toes curl. His tongue probed deeper, then focused on her clit, sucking the sensitive bud into his mouth. Her hips jerked off the bed, but Katsuki’s hand between her shoulders pressed her back down.
“Hold still,” he ordered. “Let him work.”
She tried. God, she tried. But Izuku’s mouth was a drug, his tongue tracing patterns that had her seeing stars. She was panting into the mattress, a steady stream of pleas and curses tumbling from her lips.
Katsuki shifted. She felt him move behind her, his body aligning with hers. She felt the thick, hard length of him press against her inner thigh, already slick from her arousal. Then he spat.
The warm, wet splash landed directly on her exposed entrance. She flinched at the sudden sensation, a sharp cry bursting from her.
“Good,” Katsuki growled. “Now look.”
He didn’t wait. Two thick fingers, calloused and demanding, pressed against her. With no warning, no gentle easing, he drove them deep inside her in one brutal, perfect thrust.
She screamed. The fullness was shocking, breathtaking. Her body clenched around the invasion, a vice of pure sensation. Izuku moaned against her clit, the vibration shooting straight to her core.
Katsuki fucked her with his fingers, a ruthless, pumping rhythm that matched the frantic licking of Izuku’s tongue. “See?” Katsuki’s voice was strained, thick with his own need. “See how you take it? Like you were made for this. For us.”
He crooked his fingers, dragging over a spot that made her vision white out. Her back arched as much as his weight would allow, a broken, continuous sob wracking her body. The coil inside her, so recently unwound, was winding again, tighter and hotter than before.
Izuku’s hands came up to grip her hips, holding her open for Katsuki’s thrusting fingers and for his own devouring mouth. He was breathing hard, his own arousal evident in the tense lines of his body.
“Come on his tongue,” Katsuki commanded, his pace relentless. “Do it. Soak his pretty face.”
It was the only permission she needed. The orgasm ripped through her with violent, unforgiving force. She shook apart, her cries muffled by the pillow, her body convulsing around Katsuki’s fingers as Izuku drank her down, swallowing every pulse and shudder.
As the last waves receded, Katsuki withdrew his fingers. She was limp, boneless, utterly spent. She felt him shift again, his weight settling more fully over her. The blunt, searing heat of his cock replaced his fingers, pressing against her tender, throbbing entrance.
“One more,” he whispered into her ear, his voice raw. “One more from me. Take it.”
He didn’t ask. He pushed.
The stretch was exquisite, a burning fullness that bordered on pain. She was so sensitized, so thoroughly used, that every inch of his invasion was magnified. He seated himself fully, a groan tearing from his chest.
Then he began to move.
This was different from before. It was slower, deeper, each drag of his cock inside her a deliberate claiming. His hips rolled against her ass in a grinding rhythm that pushed her face harder into the pillow. His hands gripped her hips, holding her immobile for his use.
Izuku had moved. He was beside her now, on his side, his face inches from hers. He kissed her, his lips soft against her panting mouth. His hand drifted down her body, finding the wet, swollen nub of her clit. He rubbed slow, tight circles, keeping her on the edge even as Katsuki’s relentless pace pushed her toward another peak.
“You feel him?” Izuku breathed against her lips. “Feel how deep he is?”
She could only nod, her words stolen. She felt everything. The crush of Katsuki’s chest against her back, the punishing slide of him inside her, the gentle, devastating circles of Izuku’s fingers. It was too much. It was everything.
Katsuki’s thrusts began to falter, losing their measured pace. “Fuck, Sophia,” he grunted, his voice breaking. “You’re so… fucking… tight.”
His release hit him like a detonation. He slammed into her one final time, his body going rigid, a hoarse, broken shout torn from his throat as he emptied himself inside her. The heat of it, the pulsing fullness, triggered her own shattering climax, a silent, breathless convulsion that Izuku swallowed with a kiss.
For a long moment, there was only the sound of their ragged breathing. Katsuki collapsed heavily on top of her, then rolled off almost immediately, gathering her against his side. Izuku molded himself to her front, his leg hooking over hers. They were a tangle of sweat-slick limbs and shared breath.
No one spoke. Katsuki’s hand traced idle patterns over the hibiscus lineart on her upper chest. Izuku’s fingers were intertwined with hers, resting over the ‘07’ on her hand.
Sophia’s eyes drifted shut. The anxiety was gone, evaporated in the heat of their combined need. In its place was a profound, terrifying certainty. This wasn’t an ending. It was a beginning. And as she drifted into a deep, sated sleep nestled between them, the last thing she felt was Katsuki’s lips, surprisingly soft, pressing a kiss to the crown of her head.