Brother’s Best Friend. Izuku Midoriya
|| Older brothers best friend. College AU ,slow burn smut,best friend’s little sister.||
AN: Still learning how to write smut so heh lmk if this is good🥹.Ive been hesitant to post this😭.
The moment your brother’s footsteps faded down the hall, the quiet dorm room suddenly felt charged, like the rain before a storm. You stood just inside the door, heart pounding, as Izuku Midoriya’s gaze found you. intense, steady, and somehow different from the shy boy you’d known for years. He leaned casually against your brother’s bedframe, the dim glow from the city lights casting soft shadows over his face, making his green eyes shine with something that made your stomach twist. You’d known Izuku forever your brother’s best friend since high school but recently, things had shifted. There was a tension now, unspoken but undeniable.
“I’ve wanted to do this for a while,” he said, voice low, rough around the edges. His fingers twitched at his sides, nervous energy barely contained.
You swallowed, feeling your cheeks heat up.“Oh really?.”
He stepped closer, hand reaching out to tuck a loose strand of hair behind your ear, thumb brushing your cheek gently. The simple touch sent sparks through your skin, leaving you breathless. Without warning, he closed the gap, lips pressing to yours in a kiss both soft and urgent. His hands moved to your hips, pulling you flush against him, the warmth of his body grounding and thrilling you all at once.
You stumbled back a step until the bed caught you, the mattress dipping beneath your weight as Izuku followed. His hands slid beneath your shirt, fingers trailing delicate patterns along your ribs, memorizing every inch.
“You’re driving me crazy,” he murmured against your lips.
You smiled, breath hitching. “Is that a warning or a promise?”
He chuckled, the sound low and rough. “Depends if you want me to stop.”
“No,” you whispered, pressing into him.
His fingers traced the waistband of your shorts, slipping beneath with teasing slowness. The warmth of his touch made you shiver. “Already soaking,” he murmured, thumb brushing over your folds with deliberate, slow circles.
Your back arched, lips parting in a whimper.
He teased, “Think you can handle it?”
You swallowed hard, feeling the heat pooling in your chest, but your voice stayed steady, calm despite the fire burning down below..? “I’m right here, aren’t I?”
He grins at your response. He dipped two fingers inside you, slow and careful at first, watching every reaction like he was memorizing it. You clenched around him lightly, breath catching in your throat.
“God, you feel so good,” he whispered, adding a third finger, stretching you deliciously.? His thumb never left your clit, circling in a steady rhythm that had your hips moving with his touch. He curls his fingers hitting that spot that has your lips parting, letting out soft moans.
“God Izuku…. Don’t stop….”you breathed, voice shaky.
He laughed softly, a sound full of satisfaction and tenderness. “Right here baby?”
Your hands wove through his curls as his pace picked up, fingers curling inside you just right, pressing against that perfect spot. The heat pooling low in your belly blossomed, spreading like wildfire.
“Izuku,” you gasped, hips rocking forward, desperate for more.
He groaned hearing his name fall off your lips like that, his fingers moving expertly, thumb rubbing your clit faster. His other hand slides up your waist feeling your chest.
His touch only made you wetter, more desperate. You ground your hips harder, tightening your grip on his hair. His fingers continue to move faster thrusting and curling inside of you.
Your legs shook around him as your release tore through you, his name spilling from your lips in broken moans. “I–Izuku, I’m cumming!” you gasped, your back arching off the bed, chest pressing against his as you lost yourself in the wave of pleasure.
“Mm, that’s it… make a mess on my fingers.” He pulled them from you slow, dragging the tips against your soaked entrance just to watch you shiver. His gaze never left your face as he brought them to his lips, tongue curling around them with a low, satisfied hum. The sight alone had your cheeks burning, and the way he sucked every drop from his fingers made your stomach knot with need all over again.
Without giving you a chance to respond, he hooked his fingers into the waistband of your shorts and yanked them down in one rough motion, the fabric hitting the floor before you could blink. His own clothes followed shirt tossed carelessly to the side, pants shoved down until he was bare before you, the sharp lines of his body lit by the dim glow of the room.
He climbed back onto the bed, settling between your thighs like he belonged there, hands immediately roaming, one gripping your hip tight enough to keep you in place, the other sliding up your stomach to palm your breast through your bra. His thumb teased over your nipple, the faintest smirk tugging at his lips as you squirmed. “You’re not going anywhere,” he murmured, dipping his head to drag his mouth along your neck, his free hand sliding down to cup you again, thumb pressing into your clit with slow circles.
Your breath hitched the moment he pulled his fingers away, and before you could even process what was happening, Izuku’s eyes locked onto yours dark, hungry, and completely in control. His hand gripped your hip with a strength that made your skin flush hot, fingers digging in just enough to anchor you as he positioned himself.
You felt the thick head of him press against your slick entrance, teasing the sensitive flesh with slow, deliberate pressure. God, he’s so big… The heat pooled low in your belly, stretching you in a way that made your whole body tremble. Your heart hammered, chest tightening with anticipation, and you swallowed hard, the slick wetness making the friction slick and urgent.
Then, without warning, he pushed inside, slowly at first, savoring the stretch as you gasped, nails digging into his broad shoulders. The sensation was overwhelming every inch of him filling you, hot and hard, claiming you. You could feel the muscles of his hips tense as he held still, letting you adjust, your breath coming in shaky pants.
He’s inside me. Izuku Midoriya, inside me. Your mind raced, heart pounding, and your body sang in raw, desperate need.
Then he pulled back just a bit too little and slammed forward again, hard, driving you into the mattress beneath. The sharp slap of skin echoed in the quiet room, and your breath caught in a strangled moan.
“Shit, you’re so fucking tight.” Izuku growled, voice low and rough like you’d never heard before. His green eyes burned into yours as he began setting a punishing rhythm slow, then fast, then relentless. His hands slid from your hips to your waist, gripping tight enough to bruise as he slammed into you like he couldn’t get enough.
Your body bounced with his every brutal thrust, slick heat mixing with sharp edges of pleasure and hunger. The slick wetness coating him only fueled his drive, the sounds of your moans and gasping breaths filling the room like a desperate symphony.
He’s so dominant, you thought, but it’s Izuku. The way he looks at me, like I’m everything. His lips brushed against your neck, teeth grazing your skin as he whispered, “Fuck, you fit me perfectly. Can’t get enough of this tight, pretty pussy.”
His hips slammed into you hard, each thrust deep and merciless, making your body shudder with every powerful stroke. The slick heat of your wetness coated him completely, the friction raw and urgent. You bit down hard on your lip, desperate to hold back the moans bubbling up inside you, trying to keep yourself quiet just for him.
But Izuku’s grip on your hips only tightened, fingers digging in as his voice dropped low and rough beside your ear.
“Let me hear you, baby,” he growled. “Don’t hold back.”
With a sudden, fierce surge, he slammed into you even harder, hips pounding relentlessly. The sharp slap of skin echoed around the room as your defenses shattered. Your breath hitched, and the sound you’d been holding back spilled out a desperate, ragged moan filled with need.
His thumb pressed mercilessly against your clit, rubbing hard and fast, pushing you closer to the edge. Your nails clawed into his back, pulling him closer as he fucked you with wild abandon, every thrust hitting that perfect spot that made your knees tremble uncontrollably.
“Fuck, you feel so good,” he snarled, voice thick with want. “Come for me, baby. I wanna hear you scream.”
You couldn’t help it. Your body convulsed violently, orgasm crashing through you in fierce waves, muscles clamping tightly around him as he groaned deep in his throat. But Izuku wasn’t done he fucked you harder, faster, chasing his own release as your moans filled the room, loud and uninhibited.
With a final guttural growl, he spilled inside you, chest pressing heavy against yours, both of you trembling from the intensity of your shared pleasure.
He stayed buried deep inside you, chest pressed heavy against yours as his breathing slowly evened out in the quiet dorm room. The faint hum of campus life outside barely pierced the walls, but here, in this cramped space your brother called home, everything else faded away. Your fingers traced slow circles over the taut muscles of his back, slick with sweat, marveling at how close he was so close to the world you both tried to keep separate. The same place your brother lived, studied, laughed in… now held this secret moment between you two.
His hand lifted, brushing a stray lock of hair from your flushed face, thumb lingering gently on your cheek. His voice dropped low, just for you: “You’re mine.” The words felt heavy with all the risk and intensity of what you’d done here how close you’d gotten in a space that wasn’t meant for this.
You curled into him, heart pounding not just from the aftershocks but from the thought of your brother walking in, or hearing something, or realizing. The thrill of danger mixed with a softer hope blooming inside you.
A soft creak from the hallway made you both freeze. Izuku’s lips curved into a sly smile as he whispered, “You nervous about him walking in?” His fingers traced teasing patterns down your spine. “Relax. If he catches us, I’ll say I’m just keeping you company.
His voice was low and playful, the hint of a challenge sparkling in his eyes. “But maybe… that’s part of the fun, huh?”
You bit your lip, heart racing as his hands tightened on your hips, pulling you flush against him once more. In this cramped dorm room, every stolen second felt electric, charged with danger and you couldn’t help but want more.
