Dolphin Kick – Siren!Kirishima x Human!Fem!Reader

You and Eijirou had been friends since childhood. 

When your parents split, you and your mum had moved to the seaside. You both loved water as well as the sound of the ocean so it was there that you had set up your futures.

Your mum had bought a run-down seaside hotel and bought it back to life, and you?

Well, that’s where you met Ei.

You had thought it was strange that a small boy with black hair would be just randomly floating around out in the waves a little off shore so you went out to investigate.

Turns out he wasn’t a human.

But a Merman…

He was really cute though and super nice to boot so you struck up a friendship with him.

As time passed you both grew and Ei had really bulked up. He was hot as fuck but you hadn’t ever told him that.

Was it weird that you had developed a crush on a merman?

Yeah, maybe.

Was that stopping you from seeing him secretly?

Nope.

Did your mum know about him?

Hell no!

……………………………………….

It was just on nightfall one night and you were chilling in the lounge of your seaside house when you heard a beautiful song coming from the ocean. You recognized it immediately as his song and looked up at your mum.

She hadn’t heard it. She never seemed to be able to hear it so maybe it was a song only for your ears?

“Hey mum?” you hummed, getting up from the couch and putting your phone away.

“Yeah, Hun?”

“I’m just gonna go for a beach walk,” you said with a smile, “I’ll be back in a bit.”

“Ok, baby, don’t be too long, ok?” she replied with a smile, continuing to pack the plates from the dishwasher into the cupboard.

“Ok,” you replied brightly, opening the back door and skipping out off down to the beach.

You grinned as you picked up the pace to a run and sprinted for the stretch of white sand that lead down to the ocean. 

As you got closer to the water you saw Ei a little way off and your grin widened even more (if that was even possible) 

“Hey!” you called brightly as your toes touched the waterline- the slow lap of the waves spilling over your feet periodically. 

“Come in!” he called back with a wave of his hand.

You squinted at him to see a little better. It looked like he had changed his hair colour.

“Did you dye your hair red?” you shouted above the drone of the waves.

“Oh! You noticed!” he called happily, “yeah… I did. I think it looks super manly.”

“It looks great!” 

“Come in!” he called again, waving you in with his hand.

“I… uh… I don’t have any swimmers o—,”

“Just take your clothes off!” he shouted brightly.

The look on your face was priceless.

“My clothes?!” 

He nodded, giving you that sharp toothed grin you loved so much.

“I guess he doesn’t really care that much? We’ve been friends for ages so it shouldn’t really matter if I have clothes on or off, should it? He’s a merman so maybe the human body doesn’t faze him? Has he seen naked swimmers before?”

Your mind threw around excuses and questions for a few seconds until you finally went ‘fuck it’ and started stripping off.

Trying not to make it awkward, you kept your gaze down and didn’t look up at Ei until you had started to enter the water.

“It’s so cold!” you shrieked, holding your arms up a little as you shallow breathed your way deeper- water slowly rising from your navel up to your bust line.

Eijirou’s eyes roamed your breasts and a smirk pulled at his lips a little as you kept coming towards him, having to swim now that your feet couldn’t touch the bottom.

“What? What is it?” you asked, seeing the look on his face. 

“You look good, Y/N,” he said in a deeper voice as you approached him.

“Oh uh… t-thanks?” you replied, “I guess we look kinda weird to you guys?”

“No? What do you mean?” he asked, reached a hand out to take yours and pull your body against his, “personally, I’m more attracted to human females.”

Your heart started pounding in your chest as he pulled you into his torso. You could feel his tail swishing around underneath the water to keep him buoyant, the scales from his waist down brushing against your bare lower front.

“I’ve been meaning to tell you this for a while,” he suddenly said, looking away a little before glancing back at you as you looked up at him expectantly, “I think you’re really hot.”

“H-How did you learn that word!” you squeaked with embarrassment.

“I asked you one day what you call humans who are very physically attractive and that’s what you told me. I was meaning it for you. I find you very physically attractive.” His sharp toothed grin was so innocently alluring that it made you giggle a little.

“Oh… uh well… I didn’t think you would find me attractive that’s why I took my clothes off…”

“I’ve always had an attraction to you,” he said, his hands slipping down your bare waist and around to your ass.

“Ei?!” you squeaked, pressing your body closer to his to escape the pressure of his hands on your rear. 

“Yes?” He asked, something hard suddenly appearing and pressing firmly against your lower abdomen.

“Uh…” Your attention was drawn to it and you tried to look down to see what it was but because your bodies were pressed together you couldn’t see anything.

“Can you feel my copulating organ?” he asked innocently.

You screeched and pushed him back firmly with your hands.

“What’s wrong, Y/N?” he asked a little confused by your sudden rejection.

“Is that your…. dick? I just felt against me?!”

“Is that what humans call it? Dick?”

“Uh… yeah…” 

“What do you call the human female version of the dick?” he asked.

You snorted with laughter and slapped your hand to your mouth to silence yourself.

“I’m sorry,” you giggled.

“Why is it funny?” he asked with a small smile, intrigued by your reactions.

“It’s just- no it’s fine, uh we call it… pussy…” you replied bashfully.

“Ok. Well with Merpeople, when we are really attracted to another Merperson, we find it pleasurable to put our—.”

“— aghhh yeah, ok, ok, I get it. It’s the same with humans,” you squealed, flapping your hands in the water with embarrassment.

“Wanna do it with me then?” he asked with a sharp toothed grin.

“Wait? You wanna…. with… me?!”

“Yeah? You’re hot.”

“Ei. I can’t handle you saying it so bluntly!” you squeaked with embarrassment.

“But I really like you, Y/N,” he said as he swam closer to you again, “do you like me? I thought you might have? Because you always respond to my song? Only those who are in love with the singer can hear the song…”

“Ohhhh so that explains it…” you thought, having a light bulb moment as to why you could hear the song but your mum couldn’t.

“You do, don’t you?” he asked again, gently placing his hands on your side and hovering over you a little.

“That’s not fair, because you can tell if I like you because I can hear your song! So you’ve known for a while that I like you,” you replied with averted eyes, pouting a little. 

“You got me,” he said with a chuckle, bending his head down to your ear to whisper in it. “So let’s do it,” he added seductively, his lips tickling the outer rim of your ear. 

You blushed and turned your head back a little towards his but he kept his head there and you ended up having your faces side by side- pressed together. 

Gently his lips nibbled at the soft skin of your neck- just under your ear, and your eyelids fluttered closed as your hands found the medium area where his flesh became the scales of his lower half and you toyed with the different textures under your fingertips.

He kissed lower, down your neck and around your collarbone as you tilted your head back and let him have his way.

As he started to kiss up your neck to your lips, the head of his cock pressed against your clit, rubbing gently back and forth in time with the swishes of his tail.

“Ohh~,” you moaned, tilting your hips against his and giving in to how perfect the stimulation felt.

His lips found yours and you kissed lightly a few times.

“Sorry… I don’t want to kiss you too deeply because of my sharp teeth…” he whispered, wrapping his arms around your waist and pulling you closer so that he could rub harder against you.

“That’s fine,” you panted, parting your legs a little so that you could feel him better.

Hugging desperately, you continued to rock your hips against each other, panting and groaning and occasionally kissing each other’s necks and lips.

“This feels so good, can I please have you inside me?” you asked.

“In your pussy?” he asked, lowkey excitedly.

“Yeah. Put your dick in me,” you replied desperately.

“I’ve been wanting to do this for so long!” he groaned, reaching down and grasping his cock in hand before using his other hand to raise your leg against his thigh and push up into you.

“Oh wow, you’re strong,” you panted, grabbing onto him as the head of his cock forced its way into your tight hole. 

“So… tight,” he gritted out as his hips tilted and connected with yours again. 

You let out a salacious moan as he pushed his length up into you and dug your nails in around the back of his neck and head.

“Come here,” he said, wrapping his arms around you and pulling your body close to his before he flicked his powerful tail and started swimming backwards with you up on top of him.

The rolling motion of his tail in the waves rocked up though his body and his cock thrust up and down into your core, making you release another cry of pleasure and your eyes rolled in your skull.

“Do you like that?” he asked in a strained voice, the pleasure of your warm pussy walls around his cock making it hard for him to focus on anything else. 

“God it feels so good,” you panted, mouth hanging open as his hands slid to your hips and you sat up while he continued to swim around on his back, cock pumping into you with each flick of his tail. 

“Y/N,” he groaned, “this feels so good, I knew humans were superior.”

“No, I think mer-dick and mer-sex game is way up there,” you panted, body starting to get really worked up.

“I’m close to….”

“Cum inside me, release into me, I don’t even care,” you moaned.

“It’ll be fine anyway because we’re different species,” he groaned in reply, “can I move faster?” 

“Yeah,” you moaned, basically along for the ride now- in more ways than one.

He picked up the pace, swimming faster- his cock pumping faster in unison with his flicking tail.

Small anticipatory mewls rose from within you and you looked down at Eijirou’s panting mouth, watching as his face flushed and eyes rolled then- perfectly timed- you both came, letting out moans and groans as Eijirou stopped and grabbed your body, pulling you down to him so that he could kiss your face all over.

As he kissed you, your lower halves sank down into the water again and his cock pulled out of you, his cum spilling out and washing away in the currents of the water.

“That felt amazing,” you huffed, a little breathless from that ride.

“Yeah. I’m so glad we copulated,” he replied breathlessly as well.

You chuckled and smiled then looked around, noticing you two were well out to sea now.

“Wow! How far did you swim?!” you asked him.

“Uh… not sure… did you wanna come home for a bit? It’s a full moon tonight,” he said- pointing to the bright yellow moon coming up over the horizon.

“What does that mean?” you asked.

“It means if I kiss you now you’ll turn into a mermaid until the sun rises tomorrow morning,” he said with a grin.

“Ok! Let’s go!” you said excitedly, leaning your parted lips to his.

~ END ~

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