HAPPY BIRTHDAY

HAPPY BIRTHDAY

BIRTHDAY SUIT | Bakugo Katsuki

synopsis: Bakugo never made a big deal about birthdays—just another day in his book. But you're not letting this one slide. As his partner, you know better than anyone that under that explosive exterior lies a man who deserves to be worshipped. And tonight, that’s exactly what you plan to do. Dressed in nothing but a gift-wrapped surprise, you give him a present no one else ever could—you.

content: smut, shameless smut, established relationship, lingerie sex, birthday sex, reader takes the reins, blowjob, sloppy, cowgirl , orgasm,

Bakugo never cared about birthdays. For once, he'd let you celebrate him.

No grumbles, no sarcastic muttering under his breath about “dumb-ass traditions” or “waste of time.” No disappearing off to train. No flinching when his friends shouted “Happy Birthday, Katsuki!”

He actually stayed. Enjoyed it.

The apartment had been buzzing earlier with close friends, laughter, drinks, and too many snacks. But now, it was just you and him. The glow of warm lights filled the room, soft music playing low from the speaker. The scent of buttercream and spiced candles lingered in the air.

“Sit,” you said, nudging him down onto the couch.

He dropped onto it with a tired, satisfied huff, one arm slung over the backrest as he watched you crouch beside the small stack of gifts left on the coffee table.

“Ya didn’t have to do all this, y’know,” he muttered. “Just havin’ you around is—”

“Shut up,” you smirked, passing him the first box. “You can get sappy after we’re done with presents.”

He rolled his eyes, but the blush on his ears gave him away.

One by one, he opened them. A couple of gag gifts from Kaminari, a surprisingly thoughtful book from Todoroki, custom gloves from Kirishima. A shirt from you he’d side-eyed in a store window a few weeks ago but pretended not to like. He’d mumbled, “Not bad,” when he saw it then—but the way he smiled when he saw it again tonight? That soft, flickering look in his eyes?

Yeah. He remembered.

But the last gift made him still.

He turned the box in his hand like he didn’t quite recognize it, even though you knew he did. You watched his fingers move slower—more careful. He lifted the lid and saw it:

A first edition, limited-run All Might training journal.

Something he’d mentioned in passing once during a midnight walk months ago. Something he said he always wanted but could never find.

He stared at it in silence, thumb brushing over the embossed edges.

“…You remembered that?” he asked, voice suddenly quieter. His eyes lifted to yours.

You smiled gently. “Of course I did.”

Bakugo swallowed hard, cheeks pinking up in a way that had your heart blooming in your chest. “You’re insane,” he muttered. “You know that?”

You kissed the corner of his mouth. “A little.”

He blinked hard, then cleared his throat.

“Alright, alright—cake. Let’s get this over with before I start feelin’ like a damn Hallmark card.”

You brought over the cake, candles already lit, your face glowing in the soft flicker as you sang the most off-key, dramatic “Happy Birthday” you could manage. He groaned, but he didn’t stop you.

He blew out the candles.

You sliced two pieces, handed him a fork… then stole it right back.

“Say ah.”

He narrowed his eyes. “You really gonna hand feed me right now?”

“wedding reenact,” you said, lifting a bite to his mouth.

He opened it, still scowling—but barely—as you fed him a chunk of cake. He chewed, crimson eyes on you the whole time.

“Good?” you asked.

He gave a slow, appreciative nod. “Yeah. sweet.”

"that so..."

You leaned in, swiped a little frosting from the corner of his mouth with your thumb. His lips looked so soft, gilding your frosted coated thumb onto them, then kissed it off his lips, pressing your own into the softness of his. It started soft.

But when your lips brushed his again—slow, warm, and just a little longer—his hands naturally found your waist, pulling you closer until you were nearly in his lap. He kissed back, gentle but hungry, lips parting to taste more of you.

You murmured between kisses, breath hot against his mouth: “Birthday kiss.”

He blinked slowly, his lips still parted from the kiss, eyes dazed and focused only on you. His hands stayed warm on your waist, thumbs stroking slow, thoughtless circles into your skin through the thin fabric. His gaze trailed over your face—your lips, your flushed cheeks, your eyes so full of mischief and adoration.

“You’re everything,” he murmured, almost like it slipped out without permission.

You kissed the tip of his nose, giggling softly. “Thank you.”

And then?

His grip tightened. Just slightly. And he pulled you into his lap.'

“You keep lookin’ at me like that,” he muttered, voice thick and low, “I’m gonna forget we were takin’ things slow tonight.”

You leaned in, straddling him without hesitation, your thighs hugging his hips as you settled against him. His body welcomed you instantly, his hands sliding up your sides, fingertips dragging the fabric of your top slightly—like he wanted less of it between you.

“I was never planning to go slow,” you whispered, brushing your lips just barely against his jaw. “Not tonight.”

His breath caught—sharp, audible. You felt it in his chest, the way it stuttered under your palms. His reaction was subtle, but every part of him twitched with anticipation: his hands, his legs beneath you, the slight lift of his hips like he was already imagining how this night would end.

“Got one more present for you,” you murmured into his ear. “The real one.”

Bakugo’s brows lifted, suspicious. “Thought that damn journal was the real one.”

You grinned, climbing off his lap for just a moment—enough to walk toward the bedroom with that sway you knew drove him wild.

He watched, chin propped on his hand, eyes darkening the second your fingers dipped beneath the hem of your top as you disappeared down the hall.

“Oi,” he called. “What kinda present needs you to change for it?”

You didn’t answer.

But when you reappeared in the doorway—lingerie clinging to your curves like a second skin, chosen with him in mind—Bakugo sat up so fast he nearly knocked the fork off the coffee table.

Your name left his mouth like a groan.

“Holy shit…”

You were wrapped in delicate black lace, the kind of thing he never thought he’d see outside a magazine, and even then—never on you. Never just for him.

His mind blanked.

No words, no witty comeback. Just the shape of you silhouetted in the soft golden light. The way the sheer material clung to your curves, catching every dip and swell like it had been tailored with him in mind. The way your thighs moved when you walked, slow and sure, like you knew what that sight alone was doing to him.

His mouth had gone dry.

And still, he sat there—frozen on the couch, like his body had been rooted to the spot. Only his eyes moved, dragging over you with almost painful reverence.

Your presence wasn't just seen. It was felt. In the sudden hush of the room. In the way the air itself seemed to shift as you crossed it. There was a softness to it—like watching a flame flicker behind glass. Dangerous, but so goddamn beautiful.

Something in his chest ached.

It didn’t matter how many times he saw you like this—wanting him like this. That wide-eyed, breath-stolen reaction always snuck up on him.

His gaze caught on your collarbones, then drifted lower—hesitating on the swell of your breasts barely veiled by lace, down the soft line of your stomach, until it settled between your legs, where the thin strip of fabric left far too little to the imagination.

The sight knocked the wind out of him.

One of his hands, resting uselessly on his thigh, curled into a fist. The other—he didn’t even realize—had wiped itself discreetly on his jeans, sweat clinging to his palm.

Not from nerves. No. Never that.

Except maybe this time, it was.

Because you were walking toward him now, hips rolling, eyes locked onto his, and he could feel his body respond before his brain had even caught up. His mouth parted. Breath shallowed.

God, the way you moved. Like you were pouring yourself into every step. Like you weren’t just walking to him—you were offering yourself.

It made his pulse stutter.

And when you climbed back into his lap, warm skin settling over the growing heat in his jeans, he couldn’t think. All he could do was feel. Your nails dragging against the nape of his neck in ghost trails feather-light, his body withered under the touch. Your perfume mingling with his senses what scent was that? and why cant he stop sniffing you.

"You smell really good baby...really good" his nose ghosted your neck, hips pulling you closer. Your thighs oh so soft to him, bracket him so warmly.

He didn’t speak. Couldn’t.

He just looked.

Admiration wasn’t something Bakugo handed out easily—not to friends, not to strangers, and definitely not out loud.

But he was looking at you now like you were everything. Like you were a dream made real. Like he didn’t know whether to kiss you, worship you, or fall to his knees for you.

He couldn’t stop drinking you in.

How had he gotten this lucky?

You kissed him again. Slowly, reverently. The kind of kiss that curled toes and short-circuited nerves. You would use a hand to pull him by the shirt, and when you pulled back just enough to murmur, “Happy birthday, Katsuki,” his lashes fluttered low, heat gathering in his face as he let the words sink in.

His breath hitched when your hands found his chest.

Just fingertips at first, dragging over the fabric of his shirt like you were memorizing him all over again. You didn’t rush—just let your palms glide across solid muscle, feeling the steady rise and fall of his breath as your thumbs brushed the edge of his ribs.

He was already warm under your touch. And you hadn’t even done anything yet.

Leaning in, you pressed a kiss just beneath his jaw.

Then another—lower, slower. Your lips parted against his throat, leaving open-mouthed kisses in a trail that dipped down the curve of his neck. His skin twitched under each one, the breath in his lungs turning shallow, rough.

“Knew you’d do something like this,” he murmured, but the strain in his voice made it sound more like a confession than a tease.

You didn’t answer. Just smiled against his skin, your teeth grazing lightly before you sucked. Gently—just enough to make him feel it. And then again, lower. His hands tensed at your waist.

You tilted your head to kiss along the other side of his neck, scattering another series of soft hickies—like you were branding him in lace and affection.

A groan vibrated in his chest.

Your fingers slipped to the hem of his shirt. He didn’t resist. Didn’t even move.

He just watched you. Quiet. Obedient in a way only you got to see.

You peeled his shirt up, inch by inch, revealing the planes of his stomach—warm, lightly flushed, his abs tightening beneath your gaze. You kissed his chest slowly as you exposed it, lips brushing across firm muscle, leaving kisses that lingered just a little too long.

You didn’t break eye contact.

Not once.

Even as you sank further down, mouth worshipping the path beneath his sternum. Even as your nails lightly scratched up his sides, drawing out a low hiss from between his clenched teeth.

His body was buzzing now—caught between restraint and surrender.

And it was beautiful to watch him come undone like this. Strong and scarred and still, somehow, soft for you.

His head tipped back slightly, jaw clenched, one hand gripping your hip while the other fisted into the couch cushion. His thighs flexed beneath you.

“Fuck,” he muttered, the word half breath, half plea.

You hummed softly, letting your lips hover just above his waistband.

“You’re warm,” you whispered, voice sultry and low, like you were letting him in on a secret. “All over.”

And he was.

Buzzing. Flushed. Waiting.

With his chest bare, his breathing ragged, and his eyes glassy with anticipation—he looked up at you like you were the only thing that mattered.

Your lips hovered just above the waistband of his sweats, breath brushing against the faint trail of hair disappearing beneath the fabric.

The muscles in his abdomen tensed again.

And still—you didn’t touch him where he wanted you to. Not yet.

Instead, you lifted your gaze, locking eyes with him as your mouth curved in the faintest, knowing smirk. There was power in the way he was watching you. Tension in the way his thighs shifted restlessly beneath yours.

Every inch of him buzzed.

For you.

“Can I take these off?” you asked, voice honey-slow.

Bakugo grunted, half-dazed. “… yeah.”

He sounded so obedient watching every moment like a patient puppy. His beautiful crimson eyes shimmering under the soft glow of the room.

Your fingers dipped under the waistband and dragged it down slow. The fabric caught on the hardened outline of him, and he hissed through his teeth as you freed him from the restraint.

His cock sprang up, flushed and heavy, already leaking at the tip. His hips twitched upward involuntarily, like his body was pleading before his mouth could catch up.

You made a sound of appreciation in the back of your throat—soft, reverent—before leaning in to press another kiss, just above the base. Your tongue flicked out, tasting the warm skin there.

His whole body shuddered.

“Y-you're really gonna take your time with this, huh?” he muttered, voice rough, but low with awe.

You didn’t answer.

You just looked up again, lips parted, pupils blown, hands pressing to his thighs to steady him—before licking a slow, flat stripe from the base to the tip.

Bakugo cursed under his breath, his hand flying to the back of your head on instinct—but it never pushed, never forced. Just tangled in your hair, holding on for dear life.

Your mouth closed around him, warm and wet and unforgiving.

And he melted.

His head tipped back, jaw slack, a ragged moan slipping past his lips. You sucked him down slow—sloppy and deep—letting your tongue trace every sensitive vein, letting your spit drip down over your hand as you worked the base.

He was a mess.

Every time you hollowed your cheeks and sank lower, his thighs tensed. His breath hitched. His hips jerked upward before he caught himself, groaning through clenched teeth.

"Fuck... baby… you—goddamn."

You pulled back just enough to swirl your tongue around the head, then sank down again, deeper this time.

And he twitched in your mouth, body locking up as you moaned around him.

The sound went straight to his spine—he was pulsing now, barely holding on.

When you pulled off with a wet pop, spit connecting your lips to him in a string, you wiped your mouth slowly with the back of your hand, lips swollen, eyes hooded.

“Wanna ride you,” you whispered, climbing back up into his lap. “Can I?”

Bakugo was panting. Eyes glassy. Completely undone.

He swallowed hard, leaning into your chest to whisper "Please.”

You hovered over him, your hair framing your face so bewitchingly.

You lined him up with your entrance, already soaked and pulsing for him. And as you sank down, inch by inch, his eyes rolled back and his hands grabbed your hips like he needed something to anchor him to this earth.

You moaned low as he stretched you open.

“Shit—so full,” you breathed, resting your palms on his chest.

“Look at me,” he rasped, voice trembling. “Wanna see your face.”

You did. And when your eyes met his—when he saw the way you looked at him, like he was the only one you ever wanted—his whole expression softened.

His hands caressed up your waist, slow, reverent.

“You’re fuckin’ perfect,” he whispered, voice shaking.

You didn’t move right away.

Not really.

Instead, you hovered just above him, your entrance brushing the slick, sensitive head of his cock—barely letting him in, just enough to tease. Just enough to let him feel the heat of you. Your thighs flexed slightly, hips rolling in slow, agonizing circles that dragged your soaked folds over the tip again and again.

A soft, wet sound filled the space between you. Your juices clung to him, thick and sticky, smearing across his shaft with every grind.

“Fuck,” he groaned, head thunking back against the couch. “You’re—fuckin’ killin’ me.”

You smirked, gaze flicking up to watch him.

And god… the way he looked right now? His chest rising with every ragged breath, his lip bitten raw, his knuckles white where he clutched your hips. Every muscle in his thighs was trembling beneath you. Twitching with the restraint it took not to thrust up and bury himself in you.

You leaned forward, your chest brushing his while your hips stayed in motion—rocking slowly, teasing him with slick, hot friction.

“I thought this was your birthday,” you purred into his ear. “Shouldn’t I be giving you what you want?”

Bakugo grit his teeth, his jaw tight with tension.

“I do want this,” he growled. “You drivin’ me fuckin’ insane like this—teasin’ me—makin’ me feel like I’m gonna explode just from the tip—shit…”

You giggled, soft and wicked, and sat back just enough for him to watch.

One of your hands reached between you, guiding him so the head rested right at your entrance again. You gave a few slow bounces—just the tip sliding in and out, each time making him curse louder.

“S-shit! Baby—fuck—fuck, just let me in—” His voice cracked, his fingers digging into your skin like he was about to lose it.

You finally pressed your hips down a little more, letting him sink in halfway.

His mouth fell open, a deep, guttural moan ripping out of him. His head snapped forward to look at where you were taking him in, flushed and wide-eyed.

And you just smiled at the desperation in his gaze.

“are you feeling good baby,” you whispered, dragging your nails lightly down his chest.

“God—yes—fuck yes,” he hissed, eyes fluttering as you dropped down another inch. “You feel so fuckin’ good, baby. You always do. Always…”

You leaned in again, letting your breasts press to his chest as you kissed the corner of his mouth.

“Then you better hold on,” you whispered, breath hot, “because I’m not gonna stop until you’re a mess for me.”

And with that, you finally sank down fully. All the way. His entire body jerked like he’d been electrocuted.

He let out a strangled sound—somewhere between a moan and a gasp—his head rolling back, hands gripping your ass like he was holding onto sanity itself.

You didn’t move for a moment.

Just stayed there, so full of him, clenching around him until he twitched helplessly inside you. And then—slowly, sinfully—you started to ride.

Your hips began to move again—slow, like honey melting in warm sun, like a wave building over time until it crashes. You circled them, let your walls flutter around him just to feel the way he shuddered beneath you. His eyes opened halfway, heavy-lidded and glazed, following every sensual sway of your body like it was the only thing in the world that mattered.

And to him—it was.

“Katsuki…” you whispered, your palms gliding up his abdomen. “You’re so deep.”

A sharp breath hissed between his teeth. He looked like he was trying to hold something back, but his hips bucked once—shallow, needy. You kept your pace measured, deliberate, grinding down into him with that same velvet friction that made his head roll back again.

“Shit,” he groaned, the sound low and desperate. His hands were clutching at your waist now, not to guide, but to ground himself. “You’re squeezin’ me so good—I can’t—baby, fuck—please.”

You leaned down slowly, dragging your lips across his collarbone. Then lower—pressing open-mouthed kisses to his chest, his stomach. As you moved, your body rolled into his, your rhythm never faltering, hips undulating in a steady, torturous rhythm.

Every time you sank down, he twitched inside you, groaning louder.

“I love the way you sound,” you whispered, licking the salt from his skin. “All desperate and sweet. My perfect birthday boy.”

He looked at you like he’d melt.

One of his hands slipped up your back, tangled into your hair, tugging lightly as you nuzzled his neck. You licked a stripe just beneath his ear, then suckled gently at his skin, your teeth dragging slightly—leaving soft, loving hickeys along his neck and collar.

And every one had him groaning, his cock jerking inside you.

“Gonna mark you up tonight,” you murmured. “So everyone knows who you belong to.”

“I already do,” he rasped, voice nearly broken, “fuckin’ been yours.”

You smiled into his skin and sat back again, palms braced against his chest as you began to bounce now—slow, deep, full bounces that had him clenching his jaw and moaning through his teeth. His abs flexed beneath your hands. His hands gripped your hips tighter.

Your name left his lips like a prayer.

Your hips found a rhythm—delicious, sticky, sinful—and the way he filled you, the way he responded to every little grind, made your legs start to tremble.

He felt it. His hands slid down to cup your ass again, helping support your movements as he watched you from beneath heavy lashes.

“Baby,” he breathed. “You’re—fuck—you’re gonna make me come—just like this?”

You leaned forward again, kissed him deep, then pulled back just enough to whisper:

“Yes. Inside. Don’t hold back. I want you to come just like this.”

He let out a wrecked moan, his hips finally thrusting up to meet yours, matching your rhythm.

Faster now.

Deeper.

You clung to his shoulders, your mouth falling open as the coil inside you tightened and tightened—

And then he gasped—head thrown back, mouth open, cock twitching violently inside you as he spilled, deep and thick and hot, fingers bruising your hips while he cursed your name like a confession.

You didn’t stop.

Not even then.

Still slow. Still steady. Still riding out every aftershock as he moaned beneath you, overstimulated and undone.

His eyes fluttered open, glassy and soft as they met yours. His hair stuck to his forehead. His chest heaved. His hands slid up your spine, arms curling around you as he held you close.

Your chest heaved against his, his heart pounding against your ribcage like a war drum. He was still buried deep, twitching, oversensitive—but you didn’t move. You just cradled his face, tilted it up so he had no choice but to look at you.

“Listen to you,” you whispered, voice sultry and sweet as sin. “Mouth full of curses… all because I couldn’t help creamin’ all over that fat cock.”

Bakugo groaned through clenched teeth, face flushed and jaw tight like he was holding onto the last thread of sanity.

“You heard it, didn’t you?” you murmured, grinding just enough to make him jolt, to let another wet, obscene squelch fill the space between you. “God, the noise we made—bet our neighbors think I was drowning in it.”

He groaned louder, head falling back against the couch.

You leaned down, kissed the corner of his mouth, slow and lingering, then whispered, “Soaked you, Katsuki. You feel how messy I made you? Look at your lap—look at what you did to me.”

He peeked down—eyes glassy—and let out another hoarse, broken curse when he saw the slick still glistening between your thighs, dripping slowly down both of you.

You rocked your hips again, so delicately, and he twitched inside you, helpless. His whole body shivered with a groan, his head collapsing on your shoulder "fuck enough"

You grinned. “You liked it when I sat there and shook my ass on it, didn’t you? Teasin’ you right on the tip ‘til you were cussin’ like you were about to lose your damn mind, yeah?” you grind.

“You’re—fuckin’ evil,” he gasped, fingers twitching against your waist.

You kissed his jawline this time, biting lightly just below his ear. His hands gripped you tighter again, like he was about to flip the script—but he was still spent, still weak from how you dropped your ass on him, He just held you there instead, breathing ragged, letting you purr filth against his skin.