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therainroguefanfiction · 4 years

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💕 Papa Shark (Eijirou Kirishima) 18+

Welcome to Mon-Thirst 💕

Genre: Romance, Fluff, Smut 18+

Word Count: 1,800

Pairing: F! Reader x Kirishima

World: Boku no Hero Academia

Prompt: “I stg if you sing the baby shark song one more time”

Author’s Note: Thank you to my wonderful friend, Kit, for the cursed prompt for this week’s Mon-Thirst 😂

WARNING: This fic contains adult material that should not be read by anyone under the age of eighteen. Contains: breeding kink.

If you are under the age of eighteen or just don’t want to see NSFW content, please block the tag “rains 18+”.

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You… were cursed. At least, that’s what you liked to tell yourself to describe the strange condition that ailed you. What was it? Well, you believed that you were cursed because, at random times, a song would begin to play within your head on repeat for twenty-four hours before finally fading away. You often found yourself singing aloud to these songs without realizing it and, nine times out of ten, you hated the song. It wasn’t just a simple case of, ‘oh I listened to this song and it’s catchy so now it’s stuck in my head.’ No, these were songs that you hadn’t even thought about in years, just randomly popping into your brain like an unwelcome relative sleeping on your couch and refusing to leave. It was torture.

As you stood in the living room, folding the warm laundry that had just been removed from the dryer, the words crept upon your lips without you realizing it. They had been stuck in your brain on a constant loop since you woke up and your brain just had to try expelling them. “Baby shark, doo doo doo doo doo doo. Baby shark, doo doo doo doo doo doo. Baby shark, doo doo doo doo doo doo. Baby shark!”

Though your words had been soft, they easily reached your boyfriend. Kirishima’s red eyes snapped to you from his position on the couch, an annoyed groan dying in his throat. He loved you dearly and he knew you weren’t doing it on purpose, but god if it wasn’t making him want to smash his face through the wall. Of all songs, why did it have to be that one?

“Mommy shark, doo doo doo doo doo doo. Mommy shark, doo doo doo doo doo doo. Mommy shark, doo doo doo doo doo doo. Mommy shar –”

“Y/N!” Kirishima snapped, his head falling against the back of the couch with a pained groan. “I swear to god if you sing that damn song one more time…”

Realizing that you had been doing it again, you sent him an apologetic smile. “Sorry, papa shark.”

His eyes snapped to you again, but you had already turned away, carrying the folded laundry to the bedroom to be put away. It was such a simple comment, but it stirred something deep within him. He remembered the first time the two of you met, you had commented on how he reminded you of a shark with his sharp teeth and pointed hair, so the nickname already held weight with him, but being called papa?

The thing he currently wanted most in his life was to be a father and the thought of you pregnant with his child, belly swollen as life formed within you, it had his dick hardening within his sweatpants. He had never talked to you about wanting kids, though, and he didn’t want to force or pressure you into anything. Kirishima had to get control of himself.

For the rest of the day, you were hyper-aware of every time your lips started to form the first syllable of the song and you scolded yourself, not wanting to further annoy your boyfriend that was supposed to be enjoying his day off. Kirishima, however, was watching you like a hawk, just waiting for you to slip up so he could punish you for doing so, but you were resilient.

When night fell and you were about to get into the shower, you were so relaxed by the steam filling the room that you let your guard down, the words softly falling from your lips as your hips swayed to the music playing within your head. It was an annoying ass song, to be sure, but you’d be lying if you said it wasn’t catchy.

It took a minute for the words to drift to Kirishima as he sprawled out on the bed, scrolling through his phone, but when your voice finally reached him. For a second, he just tensed up before throwing his phone onto the bed and darting for the bathroom. The sudden burst of cold air against your naked body made you shiver, eyes slightly wide as you turned to look at him, but his chest against your back prevented you from doing so.

His large hands caressed your skin, one resting on your belly. He could just picture it nice and round as his child grew within you and he groaned against your ear, grinding his hips against your ass. His voice was low and husky when he finally spoke, “I warned you about singing that song again.”

You swallowed hard, feeling your cunt throb with want as his slid down just above it, his teeth nipping at your ear. “Eijirou~”

Using his body, he lightly pushed you over to the sink and you grabbed a hold of it as his knees pushed your apart, his hand dipping lower until it ghosted over your cunt, eliciting a needy whine from your lips. “You drive me crazy, you know that?”

You sent him a playful grin, pushing your ass back against his growing erection. The moan that left his lips was like music to your ears. “That’s what I’m here for~”

With a chuckle, his fingers dipped between your folds, sliding up and down as he collected your slick on his skin. “You’re so wet for me, babe. Good, I don’t have to prep you as much.”

You breathed out as his fingers gently rubbed up against your cunt, circling around your clit before making their way back down to your entrance. “Skip the foreplay, Eijirou, I just want to feel you.”

At your command, he plunging two fingers into you, wiggling them around before pulling them out and plunging them back in. The heel of his hand rubbed against your clit with every movement, making you mewl for him with every thrust of his fingers. He could feel you clenching around him so tightly and he groaned, palming himself through his pants. He just wanted to be inside of you, to feel you squeezing his cock like your life depended on it.

“Eiji, please~” you whined, tugging at his hand until he removed his fingers from you. You watched him as he hastily stripped the clothes from his body, freeing his long cock. The tip was bright red, leaking with precum and you licked your lips, spreading your legs wider as he gave himself a couple of pumps.

His eyes met yours as his fingers slid across your cunt, collecting some of your juices to cover his cock with before lining up the head at your entrance. You whimpered, pushing back against him. He couldn’t help the smile that split his face at how badly you wanted him because he felt the exact same way about you. “I’m going in,” he breathed, hands gripping your hips as he slowly inched his dick inside of you.

You threw your head back at the way he stretched you out, filling you like no one else could. You could feel every vein along his cock, rubbing against your walls as it inched further into you. There was one that was especially thick on the underside of his cock that you absolutely loved to feel sliding against you.

When his dick reached the halfway point, his arm slid under your knee, lifting it up to open you up more. The new angle made it easier for him to bottom out in you, balls flat against you as the tip kissed your cervix. It was such a delicious feeling having Eijiriou within you, it made you feel whole and you sometimes wished you could just stay like this forever.

Your hips bucked against him and he got the hint, beginning to thrust in and out of you at a languid pace, knowing that you got far more pleasure from intercourse that way. A groan passed his hips as he leaned forward to nip at your shoulder, his free hand rolling your nipple between his calloused fingers. The steam was still pouring from the running shower, making you feel light-headed as it mixed with the heat of arousal, but that only made the pleasure build quicker.

“I love you so much, Y/N.” Eijirou couldn’t keep up the slow pace any longer, picking up speed as he thought about filling you with his seed. “I’m going to fill you so full of my cum, there’s no way you won’t get pregnant.” He growled, thrusting hard into you.

The words made your cunt clench tighter around him and you cried out, gripping at his red hair. “Do it, Eijirou. I’ll milk you dry!”

Both of you moaned in unison as you chased your highs, his hand leaving your breast in favor of massaging your clit. “I can’t wait until your full of my babies. Plump and growing as my seed grows within you. And everyone will know I did that.”

You moaned loudly, his words sending you over the edge as the coil your stomach snapped, body twitching as your orgasm rushed over you, but he didn’t stop his ministrations, thrusts turning sloppy as he chased his own orgasm. “I want your child, Eiji. Fuck, fill me with your seed, let me mother your child!”

“Fuck, I -” With one final thrust, he buried himself deep within you, his thick cum painting your inner walls white as he released his load. Just as you promised, your cunt clenched tightly around him, trying to milk every drop of cum he had to offer. Panting, his hands rested on the sink beside yours so he didn’t drop all of his weight on you, face against your shoulder as he slowly came down from his high.

You felt his hips move and you whined, pushing yourself back against him as you grabbed at his body, trying to keep him attached to you for as long as possible. “Don’t move, idiot.”

He lifted his head to rest his chin on your shoulder, sending you a pout. “You want to cockwarm standing up?”

“No,” you rolled your eyes, taking his hand in yours. “I want you to make sure your cum is in me long enough to get me pregnant.”

His dick twitched, heart skipping a beat at the words you offered him. He had assumed you were just getting into it in the heat of the moment, but he had been wrong. “You… You really want to have kids?”

You chuckled, leaning back against him as your hand rested against the nape of his neck, bringing his lips closer to your own. “Of course I do. Let’s be a family, Eiji.”

“Oh, Y/N!” Tears filled his eyes but he held them back, smashing his lips against yours, letting his lips express how happy and excited he felt.

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