The quiet hum of the U.A. High dorms after curfew usually brought a sense of calm, a gentle blanket of peace over the tired students. But tonight, for Yui Kodai, the silence was anything but tranquil. Her heart thrummed a frantic rhythm against her ribs, a secret beat that had nothing to do with her quirk, Size, and everything to do with the anticipation coiling tight in her stomach. She sat on the edge of her bed, tracing the delicate stitching of her uniform skirt, a nervous habit she’d developed over the past few weeks.

The air outside her window was thick with the scent of late-blooming jasmine, carried on a breeze that rustled the leaves of the towering trees. Inside, a different kind of tension hung heavy. It was a delicious, almost unbearable tension, born from stolen glances in the common room, lingering touches during group projects, and whispered conversations that went on far too long. Denki Kaminari, with his electrifying charm and mischievous grin, and Eijiro Kirishima, whose unwavering earnestness and rock-hard resolve always seemed to ground her, had somehow, independently, managed to carve out significant spaces in her thoughts, and now, it seemed, in her evening plans.

A soft tap, barely audible over the distant drone of the city, pulled her from her reverie. It was the agreed-upon signal. Her breath hitched, a tiny, almost imperceptible gasp escaping her lips. This was it. The breaking of one of U.A.’s most fundamental rules: no students in each other’s dorm rooms past lights out, especially not when those students were from different genders. But tonight, the thrill of the forbidden was intoxicating, a potent aphrodisiac that promised to eclipse any potential consequences. This was no ordinary study session. They all knew it.

Yui quietly slipped out of her room, her bare feet silent on the cool linoleum floor of the deserted hallway. The moon cast long, silvery shadows through the windows, illuminating their clandestine path to the small, unused classroom on the ground floor they’d chosen. It was a rarely frequented space, often reserved for make-up lessons or remedial work, making it the perfect, unnoticed sanctuary for their secret rendezvous. She found them already there, Kaminari leaning against a desk, his usual boisterous energy subdued, replaced by an intense gaze that made her knees feel weak. Kirishima sat on a stool, his typically spiky hair falling a little softer in the dim light, his broad shoulders seeming to fill the small room. Both of their eyes, wide and dark, were fixed solely on her.

The air in the room was thick with unspoken words, with desires that had been simmering beneath the surface for far too long. Yui’s heart hammered harder as she stepped fully inside, pulling the door gently closed behind her, plunging them into a deeper intimacy. The only light now came from the streetlights filtering through the window, casting a soft, almost ethereal glow on their faces. Kaminari pushed off the desk, his movements slow and deliberate, a predator in the most tantalizing sense. Kirishima rose from the stool, his presence radiating warmth and a profound sense of protectiveness. Yui felt a delicious shiver run through her, a mix of apprehension and pure, unadulterated excitement.

"Yui," Kaminari’s voice was a low murmur, uncharacteristically soft, sending prickles down her spine. He reached for her hand, his fingers intertwining with hers, a spark of his natural electricity tingling against her skin, but it was gentle, a caress rather than a shock. Kirishima mirrored the action, taking her other hand, his calloused palm warm and firm against her delicate skin. She was caught between them, a willing captive in their shared gaze, their unspoken yearning. This was a threesome she had only dared to fantasize about, a forbidden desire that was now manifesting in the most potent way, deep within the walls of Boku No Hero Academia.

Kirishima’s thumb stroked the back of her hand, a simple gesture that spoke volumes. "We... we really shouldn't be here," he whispered, his voice a gravelly rumble that vibrated through her, but his eyes, earnest and deep red, contradicted his words entirely, promising a commitment to whatever was about to unfold. His loyalty, a trait she deeply admired, extended even to this thrilling transgression of the rules. Yui felt herself nod almost imperceptibly, a silent acknowledgment of the danger, but also of the irresistible allure. It was this shared transgression, this breaking of the "Rule" that made it all the more potent, all the more thrilling.

Kaminari chuckled softly, a low, sensual sound. "Rules are made to be broken, especially when the reward is this... captivating." His eyes devoured her, lingering on the curve of her lips, the flush on her cheeks. He stepped closer, pulling her gently, almost imperceptibly, until her body was pressed between his and Kirishima’s. The heat from their bodies enveloped her, a delicious warmth that chased away the lingering chill of the night. She could smell Kirishima’s earthy, almost metallic scent of ozone and effort, and Kaminari’s lighter, sweeter aroma, like freshly zapped air and faint cologne. The combination was intoxicating.

Yui felt a soft, insistent pressure at the small of her back as Kirishima's hand moved from her hand to her waist, pulling her flush against his solid frame. At the same time, Kaminari's free hand found her other hip, his thumb beginning to rub small, mesmerizing circles against the fabric of her skirt. Her breath hitched. The contact was innocent, yet utterly charged with electricity, both literal and metaphorical. She could feel the hard planes of Kirishima’s chest against her back, the rhythmic beat of his heart echoing her own frantic pulse. Kaminari’s front was a softer, yet no less firm, embrace, his warmth radiating through her. She was deliciously trapped, and she wouldn’t have it any other way.

Her quirk, Size, often made her feel detached, an observer of the world she could manipulate with a touch. But now, she felt every inch of her body, every nerve ending alive and buzzing. She slowly lifted her head, meeting Kaminari's gaze, then Kirishima's over her shoulder. Their eyes were dark pools of desire, mirroring her own. Kaminari leaned in first, his lips brushing against hers, a feather-light touch that promised so much more. She gasped, a soft sound swallowed by the intimate space between them. He deepened the kiss, a slow, tender exploration that sent shivers through her. His tongue, playful and seeking, danced against hers, and she responded instinctively, parting her lips, inviting him deeper.

As Kaminari’s kiss grew more passionate, Kirishima’s lips found the sensitive skin of her neck, his warm breath ghosting over her earlobe before his mouth claimed the spot just beneath, sending a wave of exquisite sensation through her. Yui arched into his touch, a soft moan escaping her throat as he nibbled and sucked, leaving a trail of fire in his wake. Her hands, still held captive, were now released, finding purchase on Kaminari’s shoulders, then Kirishima’s, clinging to them as if they were her only anchors in a swirling sea of pleasure. This was the threesome she had dreamt of, a symphony of touch and taste, a duet of desire played out on her skin.

Kaminari broke the kiss, a string of saliva connecting their lips for a moment before he pulled back, his eyes dark and hungry. "You're so beautiful, Yui," he whispered, his fingers moving to the buttons of her blouse, slowly, deliberately unfastening them one by one. Kirishima, meanwhile, had moved his ministrations lower, his hand gently tracing the curve of her hip, his touch a comforting heat through the thin fabric of her skirt. Yui felt a blush creep up her neck, but it was a blush of pure arousal, not embarrassment. She wanted this, every single forbidden second of it.

The blouse fell open, revealing the pristine white of her undershirt. Kaminari's gaze lingered on the swell of her breasts, barely contained by the fabric. With a mischievous grin, he reached out, his fingers brushing the fabric of her shirt, and Yui, understanding his unspoken intention, focused her quirk. With a subtle shift in her focus, she touched the material, and it began to shrink, tightening around her breasts, accentuating their fullness, creating a delectable pressure. Kaminari’s eyes widened in appreciation, a low growl rumbling in his chest. "Oh, Yui," he breathed, "You're incredible."

Kirishima, seeing the effect of her quirk, chuckled, a deep, throaty sound. His hands moved from her hips to the hem of her skirt, his fingers delicately teasing the fabric. "Let me help you with that, beautiful," he murmured, and with a swift, practiced motion, he unzipped her skirt. It slid down her hips, pooling at her feet, leaving her in only her underwear. The cool air on her bare skin was a sudden shock, quickly replaced by the radiating warmth of their proximity. She felt utterly exposed, utterly vulnerable, and utterly alive.

Kaminari’s hands found the soft skin of her waist, then ventured higher, pushing aside the now-too-tight undershirt. His palms covered her breasts, his thumbs brushing over her hardened nipples, eliciting a sharp gasp from her. "So sensitive," he murmured, his voice thick with desire. He leaned down, his mouth closing over one of her nipples, sucking gently, drawing forth a moan that surprised even Yui herself. Her fingers tangled in his spiky blonde hair, holding him closer, urging him on.

As Kaminari lavished attention on her breasts, Kirishima knelt before her, his strong hands sliding over her thighs, pushing the fabric of her panties aside. Yui gasped, her legs trembling. His gaze was intense, unwavering, as he looked up at her, a silent question in his eyes. She nodded, her breath coming in ragged gasps. This was it. The moment she had both feared and craved. Kirishima leaned in, his warm tongue flicking out, tasting the sensitive skin of her inner thigh, then moving higher, teasing the very edge of her damp folds.

A wave of pure pleasure, hot and insistent, washed over Yui. She gripped Kaminari’s hair tighter, her body arching involuntarily. Kirishima’s tongue was hot and wet, a masterful instrument of pleasure, as he began to explore her most intimate depths. He licked and suckled, his breath hot against her clitoris, causing her to cry out, a soft, desperate sound. Kaminari, ever attuned to her needs, leaned down, capturing her lips in another searing kiss, swallowing her cries, deepening the raw, untamed pleasure that Kirishima was skillfully coaxing from her.

Between them, Yui felt herself unraveling. Kirishima’s mouth was a wonderland of sensation, his tongue swirling and probing, his lips drawing on her with a sensual suction that made her toes curl. He found her clitoris, circling it with exquisite precision, then flicking it teasingly with the tip of his tongue. Her body was writhing, a symphony of shivers and tremors. She felt a delicious pressure building deep inside her, a familiar precursor to climax, but this time, it was amplified, intensified by the dual assault on her senses. She knew this was just the beginning of their threesome, a taste of the intoxicating delights that awaited her.

Just as she felt the first tremors of an orgasm beginning to bloom, Kirishima pulled away, leaving her breathless and panting, her body still buzzing with unreleased energy. He rose, his eyes full of tenderness and a smoldering heat. Kaminari, too, pulled back from her lips, his fingers trailing down her stomach, then slipping beneath the elastic of her panties. With a swift, gentle tug, he freed her from the last vestiges of her clothing, letting them fall to the floor with a soft sigh. Yui stood before them, naked, vulnerable, and completely ready.

Kirishima reached out, his hand finding the soft mound between her legs, gently parting her damp folds. "You're so wet, Yui," he whispered, his voice thick with awe. His fingers brushed against her swollen clitoris, sending a fresh wave of shivers through her. Kaminari, ever the impulsive one, pushed her gently towards the old wooden desk in the center of the room. "Come here," he commanded softly, his eyes alight with mischief and desire. Yui, her mind hazy with pleasure, obeyed, leaning back against the cool, smooth surface of the desk, her legs parting slightly in an unspoken invitation.

Kaminari quickly shed his own clothes, his muscular body lean and toned, his dick already standing tall and proud, throbbing with anticipation. Kirishima followed suit, his broad, powerful frame a testament to his hardening quirk, his own erection thick and impressive. Yui felt a thrill of pure, primal lust seeing them both, naked and aroused, standing before her. This was the moment. The culmination of weeks of unspoken longing, of forbidden glances. This was Yui Kodai about to experience the depths of pleasure with her two secret admirers.

Kaminari, with a grin, knelt between her legs, his strong hands lifting her thighs, resting them on his shoulders. The angle was intimate, exposing her completely. He leaned forward, his erect penis pressing against her glistening entrance. Yui gasped, her hips instinctively bucking forward, eager for the invasion. "Easy, easy," he murmured, his voice a low rumble. He began to slowly push inside her, a gentle pressure that stretched her, filled her, making her moan aloud. The sensation of his thick shaft slowly sliding into her, filling her completely, was exquisite. She felt a delicious fullness, a warmth spreading through her core.

Just as Kaminari was fully seated within her, Kirishima moved in, kneeling behind him, his own hard dick pressing against her backside, seeking her other entrance. Yui's eyes widened. Double Penetration. It was even more audacious, more thrilling than she had imagined. She felt a rush of both fear and intense excitement. Kirishima leaned in, his lips brushing her ear. "Ready, Yui?" he whispered, his voice full of concern and a dominant edge. She could only nod, her breath catching in her throat, her body trembling with anticipation.

He began to push, slowly, deliberately, into her tight anal entrance. Yui cried out, a sharp, surprised sound. It was tight, so incredibly tight, a sensation completely new and overwhelming. Tears pricked at the corners of her eyes, but they were tears of both pain and intense pleasure. Kaminari, feeling her discomfort, paused his movements within her, his hips still. "Are you okay, darling?" he asked, his voice laced with concern. Yui gritted her teeth, then, with a deep breath, she focused her quirk. She reached back, pressing her hand against her own inner thigh, concentrating on the muscles around her ass. She willed them to relax, to stretch, to accommodate, a subtle manipulation of her own body's size on a microscopic level. It was a risky maneuver, pushing the boundaries of her quirk’s application, but she needed it.

A moment later, she felt a slight release, a subtle expansion. "Now," she whispered, her voice hoarse. Kirishima resumed his slow, persistent push, and this time, though still a delicious challenge, it was less painful, more pleasurable. He slid deeper and deeper, until he too was fully buried within her, his hot length filling her backside completely. Yui cried out again, a sound of pure, unadulterated ecstasy, her body now stretched to its absolute limits, utterly consumed by the two powerful men who were now intertwined with her.

Her hands gripped the edge of the desk, her knuckles white. Kaminari, seeing she was now accommodated, began to move again, his hips thrusting slowly, deliberately, inside her tight vagina. The sensation was beyond words: a delicious stretch, a grinding pleasure as his balls slapped against her clitoris with each thrust. Then Kirishima joined him, his movements slower, more controlled, in her anal opening, a rhythmic pumping that sent shockwaves of pleasure through her. This was the ultimate threesome, the ultimate expression of her hidden desires, played out in the forbidden halls of U.A. High.

The rhythm quickened, a primal dance of bodies intertwined. Kaminari pushed deeper with each thrust, seeking her G-spot, grinding against it with an expert precision that made her moan uncontrollably. Kirishima’s movements were powerful, his large dick stretching her to her absolute maximum, igniting a new kind of pleasure deep within her. Yui felt her clitoris throbbing, engorged and exquisitely sensitive, rubbed by Kaminari's intense thrusts and the vibrations from Kirishima's movements behind him. She was being pleasured from every angle, her body screaming with a delicious agony that bordered on pure bliss.

She could hear her own gasps, their grunts, the wet, slapping sounds of skin against skin echoing in the small classroom. Her body was slick with sweat, her hair clinging to her temples. Kaminari leaned forward, capturing her lips in a deep, passionate kiss, his tongue invading her mouth as his hips continued their relentless rhythm. Kirishima, from behind, buried his face in her hair, inhaling her scent, his strong hands gripping her hips, holding her firmly in place as he pounded into her. This was raw, untamed passion, a storm of sensation that threatened to consume them all.

Yui felt the pressure building again, a familiar coil of exquisite tension tightening in her core. She was nearing the edge, hovering on the precipice of a shattering orgasm. She pushed back against Kaminari, her hips arching, desperate for more. "Oh, please," she whimpered, her voice barely audible. Both men seemed to understand, their thrusts growing more fervent, more desperate. Kaminari leaned in, his voice ragged. "Come for us, Yui. Let go."

Her climax hit her like an electric shock, a surge of pure, unadulterated pleasure that rippled through her entire body. She cried out, a guttural sound torn from her throat, her body convulsing wildly around their thick shafts. Her legs wrapped around Kaminari’s waist, pulling him deeper, her muscles clenching and milking his dick. Kirishima, feeling her orgasm, let out a primal roar, driving his own thrusts even harder, deeper, his body shaking with the force of his passion. He matched her climax, his muscles hardening even further as he poured his seed deep inside her, a hot, thick creampie filling her tight backside, a wave of warmth spreading through her as his cum pulsed deep within her.

Kaminari groaned, his own orgasm building rapidly. With a few more powerful thrusts, he too let go, crying out her name as he flooded her sensitive depths with his own hot, potent creampie. Yui felt the double creampie, the warm, sticky liquid filling both her entrances, a profound sense of fullness and satisfaction washing over her. She was completely saturated, completely used, and completely, utterly fulfilled. She collapsed against the desk, panting, her body humming with the aftershocks of their intense shared climax.

They remained intertwined for a long moment, their heavy breaths slowly evening out. The silence in the classroom was no longer tense, but soft, peaceful, filled with the lingering echoes of their passion. Kaminari slowly pulled out of her, his dick slick and glistening, his eyes gazing at her with a profound tenderness. Kirishima followed suit, his own withdrawal a gentle release that left her feeling both empty and incredibly loved. He turned her around, pulling her into a tight, comforting embrace against his broad chest, her head resting against his shoulder. Kaminari lay beside them, his arm wrapping around Yui’s waist, pulling her closer still.

Yui felt a tear slip down her temple, but it was a tear of joy, of utter contentment. She was sandwiched between them, her body still throbbing from their combined assault, their scent clinging to her, a delicious reminder of their forbidden encounter. Kirishima pressed a soft kiss to her hair. "You were incredible, Yui," he whispered, his voice rough with emotion. Kaminari’s fingers stroked her side gently. "More than incredible. You're... everything."

She closed her eyes, letting their words wash over her, letting the warmth of their bodies soothe her. The risk, the breaking of the "Rule," the intensity of the double penetration and the creampies, had all been worth it. This was more than just a sexual encounter; it was an affirmation of a deeper connection, a shared intimacy that transcended the simple boundaries of friendship. As the first hint of dawn began to paint the sky a soft lavender, filtering through the classroom window, Yui Kodai knew, with a certainty that settled deep in her soul, that this illicit, passionate threesome was just the beginning of a beautiful, complicated, and utterly fulfilling journey within the halls of Boku No Hero Academia.