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flametrashira · 4 months

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To celebrate finishing my first semester of grad school, may I request some hcs for Speed-o-Sound Sonic? I watched opm because of your fic about him and I've been brainrotting ever since.

AN: You are literally my favorite person in the world today. Thank you thank you thank you! I cannot tell you how happy seeing this ask made me! I love SoS Sonic so fucking much it's unreal and I'm always down to write about him. Also congratulations on finishing your first semester!

Pairing: Speed-o-sound Sonic x f!reader

Content Guidance: NSFW.

Speed-o'-Sound Sonic NSFW Headcanons

Sonic grew up in the Ninja Village, where emotion was seen as weakness to be beaten out of him. He's also a rebel, so when he falls for you it feels forbidden, and that makes him want you more.

He falls for you with the same intensity he falls into rivalry with Saitama. He's used to being feared and despised, or even just called a creep, so the poor guy is a goner when he realizes you like him back.

It doesn't matter that you live on the 25th floor of your apartment building (and he could easily take the elevator,) Sonic is climbing through your window at night to see you.

He perches on your window ledge, purple scarf flowing majestically behind him for a moment before he steps gracefully down into your bedroom.

"I was just passing by and thought I'd call in." Completely omits the part where there are three squad cars and two A class heros searching for him because he just threw an exploding shuriken into a crowd thinking he saw that caped baldy.

But getting to spend time with you is a pleasant way to lay low.

He'll never admit it but he's so grateful of the nights you ask him to sleep over. He's perfectly capable of sleeping in trees or in abandoned buildings, but having a comfortable warm bed to snuggle his soft, warm girlfriend in is heaven.

But he'll demonstrate his gratitude. He'll literally spend the night on his knees for you if you wish it.

He's a switch; he will absolutely torment and taunt you as a dom and be the prettiest, brattiest, most satisfying to break sub.

But he'll also be absolutely satisfied with no dom/sub dynamic at all. To be honest, he soaks up any kind of affection or pleasure he can because he knows he isn't supposed to.

He's also unexpectedly snuggly. You'd think being a ninja assassin would make him cold and calculating, but he's never been good at switching off his feelings.

As for sex, as you'd expect, he likes it fast.

In fact, he can move his body (or parts of it) so fast he can vibrate. Which is... handy.

And he loves doing this to you, making his hands or his tongue move at super sonic speeds to get you off. (Saitama could never)

Quickie king.

However, you want to wreck him (of course you do) slow... way... down.

get on top of him and ride him so slowly, pinning his hands to the bed. He's so whiny and vocal, begging you to go fast and to let him cum. But he loves it if you keep teasing and drag it out as long as possible.

Kiss his scars and let him know he's safe and adored.

His hip bones are so ticklish but he melts if you kiss them. It makes him gasp and squirm.

He's very flexible so he'll find a way to make pretty much any position work.

Now, obviously I need to talk about his balls. Those poor things took a beating and tbh he was absolutely traumatized by it.

It takes a while before he's comfortable with you touching them. You should feel honored when he does; it means he trusts you completely.

When you lick and suck them he can't keep his ass on the bed. His back arches so prettily.

His whimpers are the most beautiful, desperate sound you will ever hear.

Sonic likes to have you cockwarm him while he meditates. His goal is to remain completely calm, not reacting at all to the way your pussy throbs around his cock, focused only on his goal of surpassing his enemies. Of course he crumbles every single time. He can't resist you.

Sit in his lap and cockwarm him face-to-face, kissing his neck while he tries to remain focused. He will crack so quickly.

One day he realizes he doesn't try to hide his smiles around you. You just bring them out of him so easily.

And you realize he's been sneaking in through the window every night for months so he may as well just have a key. That touches him immensely. It means the world to him to have a place where he belongs, to be trusted and loved that much.

He still sneaks in through the window.

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flametrashira · 7 months

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Pairing: Speed-O-Sound Sonic (One Punch Man) x fem!reader

Summary: You were once a villain, committing crimes alongside your boyfriend, the world's fastest ninja, Speed-O-Sound Sonic. Now you're working as a registered hero, trying to atone for your colorful past... if you can only resist getting back together with him.

Warnings: NSFW

How NOT to Arrest Your Toxic Ninja Ex-boyfriend

Something was up.

You knew a Class C hero such as yourself would never have had a chance at catching one of the Hero Association’s most wanted criminals–let alone one as fast or deadly as Speed-o’-Sound Sonic– and yet, there he was, seemingly defeated and staring at you as he sat handcuffed to your water pipes.

“What gives?” you asked.

His pale blue eyes flashed mischievously. “I don’t know what you mean.”

“You let me catch you.”

“Did I?” His gaze remained completely neutral. “Now why would I do that?”

This fucking guy. He was so damn smug, sitting pretty on your floor, his tight black ninja-suit leaving absolutely nothing to the imagination. Not that you needed to imagine anything.

Speed-o'-Sound Sonic was, after all, your ex-boyfriend, and you knew exactly what lay beneath that bodysuit. You knew every line of his body, every curve, every scar… hell, you'd even given him some of those yourself.

But Sonic was bad news all round. Especially when you were trying to atone for your less than shining past and become a hero.

He’d been causing mayhem for weeks, pursued by– and skillfully evading– Class S heroes, so you knew there was no way in hell the ninja assassin was actually your captive. You knew him far better than that. So, you stayed on your guard, heart pounding from the adrenaline of the fight and… something you were trying very hard not to think about.

You had hoped to never see him again, not this close anyway.

"Is it so hard to believe that you caught me? It isn't the first time you've had me in handcuffs after all, is it?" He leisurely stretched out his leg, pointing his toes like a cat basking in the sun. “You beat me fair and square, princess. I suppose you’d better bring me in.”

“Mhm, whatever you say…” you raised a cynical eyebrow, which earned you a chuckle.

"What? You don't believe you're good enough?"

"It's not that. I just know you."

“Alright,” he said with a smirk. “Guess you're not half as naïve as you used to be.”

He was free of the restraints before your eyes could even register his movement. You ducked in time to avoid the kunai aimed for your left shoulder, but the cold press of steel at your throat forced a gasp from your lips as you stared into his ice blue eyes. He had you beat in a flash.

“Bastard,” you spat, leaping back, drawing your own blade and adopting a defensive stance.

Sonic chuckled gleefully for a second before covering his mouth with his hand and clearing his throat, returning to that same cold, hard stare. Ninjas weren’t supposed to show emotion, though Sonic had never been very good at that. Matter of fact, he was terrible at it.

A moment later he darted toward you once more. You parried the attack with your sword, buying you a second before he lunged for you again. The assault was half hearted… for him anyway.

He grinned as your swords clashed. “You could’ve just gone along with my plan, you know? I had no intention of killing you as long as you didn’t stand in my way.”

You evaded his next strike, his movements so familiar to you after years of training together and fighting alongside each other. “Oh yeah? And what plan was that?”

“You think I’m stupid enough to reveal my plans to a hero?” he scoffed and narrowed his eyes. “Let’s just say my real target is in a maximum security prison, and I needed an in.”

You frowned, confused for a second; not just because he immediately revealed his plan to you after saying he wouldn’t but… because his plan didn’t make much sense. He took advantage of the distraction and disarmed you.

Your sword clattered to the ground. “So you’re killing criminals now?”

“I’m not picky about my targets as long as the money’s right. Anyway, shut up.”

“Or what?” you asked, which seemed pretty asinine considering he literally had a katana to your neck.

Sonic seemed to think so too. Your question gave him pause which is exactly what you needed. He was faster than you, but you were stronger, and you weren’t going to waste that moment of hesitation. You shoved him hard in the center of his chest, ducking as he swung his sword toward you and almost costing him his footing.

“You little–”

It didn't matter. He was on you again a moment later, impossibly fast and ruthless. He’d gotten stronger in the years you’d been apart. He’d gotten better. And the straight and narrow had blunted your proverbial claws.

He pinned you to the wall of your apartment with a hand around your throat, grinning from ear to ear. “You may be feisty, but you’re no match for me. It's funny really. I actually don’t even want to kill you. I just want to see what your next reckless move is going to be.”

His face was so close, his body flush against yours with only the thin blade of his razor-sharp katana separating you. You hated this sly creep with every fiber of your being; his cold, killer instincts, his smug, self assured attitude, the distracting curves of his lean body which kept you pinned to the wall.

How many times had you been in this position with him, gasping as he showed you exactly how he could use his preternatural speed. Sonic was undeniably a shithead, but there had definitely been advantages to having a boyfriend who could move so fast it made him vibrate.

A knot in your belly once loosened, grew tight.

You sucked in a breath, “Asshole.”

“That all you’ve got?”

“Fucking asshole.”

“Mmh… better.” He laughed, his breath hot against your lips as he held you firmly. His feline eyes brightened in amusement at your futile attempts. He’d always loved your pettiness.

You clenched your teeth and silently seethed. Did he have to be so damn pretty?

You made one more attempt to break free, trying to push him away, but he only pressed tighter against you, his thigh now fully braced between yours, applying humiliating, delicious pressure to your duplicitous core. Trying to squirm free only succeeded in creating more friction and making your face grow hotter.

He knew it too. Sonic's lips curved into a devilish grin, as his cheeks turned a little pinker. "Did you miss this?"

His question gave you pause. Your heart lunged. Yes, you missed it. You missed the passion, the danger, the thrill of doing whatever the hell you wanted with him. But you were good now; a registered hero… people depended on you to bring villains like him down. Gone were the days of fucking your ninja assassin boyfriend until you could barely walk.

You drew a deep breath. "No."

"Liar." He smirked, his face no more than an inch from yours. "You and I both know you're no angel, princess. No matter what, you’ll always be my bad girl."

A moan escaped you before you could stop it. Your eyes widened as you clamped a hand over your mouth.

"Ah," Sonic grinned victoriously. "There she is."

"D-don't–"

"Don’t what? Call you my bad girl? Why? You gonna start acting on it?" He moved his thigh ever so slightly, sending a tingle of pleasure through your body.

"God, Sonic..."

It was his turn to moan as you whimpered his name. His lips were so close they ghosted against yours as he whispered, "Oh princess… I'm not ashamed to admit that I definitely missed this."

You couldn't stand it. You couldn't stand him. And yet, you pulled him into a claiming kiss, filled with frustration and the desire to put him in his place as you felt him smile against your lips. He was just as awful as the day you walked away from him. And just as wonderful. Bearing down on his thigh, you sighed in relief.

Kissing him felt like coming home when you hadn't made the bed, there were dishes in the sink, and the garbage was overflowing– it was messy and annoying but it was where you belonged.

He silently sheathed his katana and interlocked his fingers with yours, raising your hands to hold them against the wall as his tongue explored your mouth. With every passing second you rediscovered one more thing you hadn’t realized you’d missed so badly; the sound of his approving hums, his familiar choji oil scent, and the way his ninja suit prevented you from touching a single inch of his skin while simultaneously allowing you to trace every mouth-watering curve of his honestly absolutely insane figure.

You tilted your hips against his long, muscular thigh and Sonic moved with you, only too happy to assist in your ruin as your kisses grew more heated. He released his grip on your hands. Muscle memory led your fingers to the purple scarf around his neck, tugging him toward you and earning you a quiet groan as his gloved hands slipped beneath your shirt.

It wasn't enough for either of you.

His brow creased in frustration as his cloth-encased fingers skated along your skin, a barrier between you he just couldn’t stand. A moment later he was yanking away the scarf and pulling down the top of his suit. He tugged the elasticated fabric from his arms and torso,wriggling out of the collar until the suit gathered around his waist and he could finally, finally, touch you skin-to-skin.

There was no point in pretending you didn’t want this anymore. You had never been able to resist him and he knew it all too well. Your hands grasped at whatever they could, following familiar paths along scarred sinew and muscle.

You rocked against each other, purely for your physical pleasure, but his heated gasps and broken moans were just as desperate as yours. He was getting so much from it too. He was getting you.

"Why did you leave me?" he whispered against your lips as you continued to grind against his thigh.

"Because… you're bad."

"Yeah." He chuckled between panting breaths, swiping his thumbs over your already-hard nipples. "But so are you, princess. So are you."

A thread snapped within you and you shuddered through your orgasm, groaning into his eager mouth as he held you, pinning you between the wall and his body.

Just as you were coming back down to earth, your phone vibrated on the kitchen counter, the Heroes’ Association’s contact flashing on the screen. It was now or never, two choices lying before you; answer and give away his location, or ignore the call and indulge in him. The life of a hero, or a life by his side.

He laughed– so cocky, so irresistible– pressing a sweet, affectionate kiss to your burning cheek. "Have you got it all out of your system, or are you gonna admit that you'll never get enough of me?"

That bastard. He knew the answer, he just wanted to hear it from your lips.

Your pride was a small price to pay. "I… want more."

He flashed his Jack-o-lantern grin. "Oh really? Let me hear it then, princess. Tell me what you want."

If not for the subtle shakiness of his breath, you'd think he was totally in control of his own urges, content just to let you get off and walk away again. But you knew him better than that.

"You," you answered finally.

That was all he needed. His lips were on yours again as you stumbled together toward the bedroom, hands exploring every inch of his body, ignoring the futile buzzes from your phone.

There was no point in denying that with Speed-o’-Sound Sonic, being bad felt so fucking good.

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