Nitrogen Narcosis – Adult!Merman!Kaminari x Adult!Human!Female!Reader

You had always enjoyed scuba diving. There was just something about exploring deep waters that had always intrigued you. 

For the most part, the most exciting sea creatures you had ever come across were sharks, manta rays, and sunfish.

Until that Tuesday…

It was late, and you were heading out to sea to watch the coral spawn in the full moon.

You had your usual skipper with you, manning the boat, so you felt safe and confident. 

“Where ya wanna go?” he asked through his thick beard as he drove the boat out into the open waters, “best we don’t head west, them mermen’ll getcha.”

You stopped what you were doing, half bent over to fix something on your scuba gear, and looked up at him.

Surely he was joking, right? Merpeople didn’t exist.

You were expecting to see a smirk on his face but he was dead serious and you straightened to watch him closer before asking your potentially tease worthy question.

“Are you being serious?” you asked dubiously when he hadn’t cracked a smile.

He nodded.

“No… seriously. Merpeople don’t exist… do they?” you asked, furrowing your brow in confusion.

He nodded again and looked out over the black waters at the front of the boat as you sped out towards the night horizon.

“Them’s is real alright,” he said gruffly, “I seen’em en I heard stories ’bout ’em.”

“You have seen a merperson?” You asked, still not really believing him as you narrowed your eyes at him, expecting that he would break into a smile at any given moment and call you an idiot for believing his prank.

“Aye,” he replied seriously, “I did seen’em. Frightful creature… long nails en a harrowing face. Haunts me dreams, it does.”

“Are you sure it wasn’t some kind of manatee or dugong?” you asked, looking out over the boat as well to see the water ahead.

“Has you ever seen a dugong with nails? That screeches like Doug wif ‘is hand stuck en the mincer?” he asked, using the name of a fellow sailor mate of his to illustrate his story.

“It screeched?” you asked.

“Aye, never forget it,” he replied with a solemn nod.

“Uh… ok, don’t go west then,” you said, feeling a little creeped out now.

The conversation died off then, and you went back to getting your scuba gear ready before heading underwater to watch the coral spawn.

“Maybe this wasn’t such a good idea after all… it’s going to be very eerie in the water with just an underwater torch. I’ll need to keep an eye out for sharks too.”

Pulling your gear on, you waited until your skipper had pulled up near the reef and you sat on the side of the boat and looked at him, putting your mask on and breathing a few times to make sure everything was working.

“Jes pull on this ‘ere line if you get in trouble,” he said, securing a rope around your waist, “I’ll be on t’other end.”

You did the ‘thumbs up’, then fell backwards overboard and sank into the cold black water.

You couldn’t see a damn thing, and quickly grabbed your torch to flick it on so you could, at least, navigate your way to the reef.

It was indeed very dark, but everything seemed fine, and you couldn’t see any predators around, so you tried to relax and focus on what you had originally come to see.

Ahead, a wall of coral met your squinting eyes and as the bubbles cleared from your exhale, you could see small coral spores being released into the water.

Fascination took over and you kicked gently closer to the coral to take a better look.

Colourful fish were darting in and out of their respective homes and you smiled to yourself as you got in amongst them.

Feeling a little better, now that you had fishy company, you swam deeper into the coral coves, checking out everything there.

Night time had been a good choice as most of the sea creatures in that area were out and about and you even got to see a few octopus as you swam around.

You were just coming around the back end of some coral when your flipper knocked something and you turned around and pointed your flashlight behind you to see what you had hit- praying you hadn’t broken the coral.

To your surprise, the waters behind you were open and clear of anything, and you looked around, confused.

“I swear my flipper hit something?” you thought, before shrugging and looking back to where you were going.

As your torch light flicked to in front of you again, you thought you saw a flash of something, and turned your torch in that direction, but again, you couldn’t see anything amiss… not even the creatures around you seemed disturbed.

“It’s just my imagination,” you thought, focusing on the coral again.

You swam between two large pieces of columned coral and as you came out the other side, you honestly… definitely… saw something move in the periphery of your vision and quickly moved your torch to that spot to check…

But again…

Nothing.

You were starting to feel a little spooked now. Three times, you had thought you had seen or accidentally kicked something- and that something seemed large, maybe at least the same size as you…

Deciding that it might be time to head back, you turned around and started back through the coral pillars.

You had just swim out the other side when you saw a flash of yellow from the outer rim of the torch light and you quickly spun your torch to see what it was but it had gotten away again.

You stopped there, slowly spinning back and forth, whipping your torch around in all directions to see this… thing.

You knew you had seen something.

Your poor heart and breathing rate were both elevated and you knew you didn’t have a lot of time left if you kept this up, so turned one last time towards the direction of the boat but all of a sudden there was a male face in front of you and your mask was ripped from your face before a pair of lips met yours.

You passed out at that point.

………………….

It was a while later that you came too and opened your eyes.

You were still underwater. With no mask on… but able to breathe?! 

You freaked out immediately, panicking and screaming a hell of a lot of bubbles into the water.

Through your panic, you noticed you were sitting inside a rather large clam shell that had a soft layer (kinda looking like a bed) and there were bioluminescent algae strung around this bed looking clam thing too.

“What?! Where?! Who?!” you screamed internally.

As you were looking around, eyes still wide with fear, a male head popped up from behind a rock nearby.

You almost screamed again, but seeing as it was a cute male face, you didn’t.

“Where am I?!” you asked this stranger, who also… didn’t have a mask on, “who are you? What is this place? How come I can breathe under water?”

“Hey,” the friendly male said as he allowed more of himself to show to you.

Your eyes travelled from his cute face and blond hair, with a black streak in it, down his lean body, to his bare abdomen and lower to his— MERMAN TAIL?!”

You freaked out again, but he called gently to calm you, swimming over quickly to try and placate you.

“You?! You?! You?!” you screeched in bubbled shock.

“Kaminari Denki, yes, that’s me, and yes, I’m a merman,” he said with a flirtatious smile, “I gotta say, I had been tailing you for a while. That ass of yours is a sight to behold.”

“How can I breathe under water?!” you asked, still reeling from this encounter.

“Oh. I kissed you, you don’t remember? It happened a little suddenly, and then you passed out so I bought you here. It’s a full moon. And if I kiss you on a full moon you’ll be able to breathe under water… until daylight. I think?… I should check that actually?” He stopped to ponder it for a second and you blinked at him.

Suddenly you remembered what your skipper had said about the merperson he saw and you frowned slightly and tilted your head at Kaminari, who looked at you.

“What?” he asked.

“Oh… uh… nothing, my… umm… you’re cute. I was told maybe you water people might not be??”

“You think I’m cute?!” Kaminari asked with a delighted look on his face as he swiftly swam around to your other side and gave you a sultry look, “well, I think you’re pretty sexy for a human too.”

“What do the usual humans look like?” you asked curiously, feeling like he had seen some ‘not so nice’ looking humans.

“Well… uh… they don’t usually have nice asses like you do,” he said, reaching a hand to touch your side as he sidled up to you.

“Oh… I see, you’re an ass merman then, I guess?”

“I’m an ‘appreciator of anything female and sexy’ kinda guy,” he replied with a sexy smirk.

“Well… seeing as I probably don’t have a lot of time left here… and this might be the only time I get to spend with a real merman, did you wanna touch my butt?” you half laughed, finding this whole thing somewhat comical now as you got up on hands and knees and spun your ass towards him, wiggling it a little in your tight wet suit.

“You’re cool if I touch it?” he asked with surprise and delight, grinning happily as he held both hands out with the grabby hands motion, but refraining from touching you until you had given him permission.

“Yeah, why not. It’ll be a story to tell if I randomly blurt out at a party ‘by the way, a merman touched my butt’.” You laughed.

“I don’t think anyone would believe you… but why stop at touching butts. Why not do more?” he asked, hinting that he would definitely be open to more.

“What do you suggest?” you asked, looking back over your shoulder at him as he copped a handful of your ass.

“Mmmmm?” he hummed, thinking as he gently squeezed your ass cheeks in his hands, “I can think of something… but it would involve you being out of this… black extra skin, thing… what do you call this?” He pinched at your wet suit.

“Oh. It’s called a wetsuit,” you replied, reaching for the zipper at the front and tugging it down.

Kaminari was surprised that you were getting out of it so quickly and didn’t quite know what to say as your bare back became exposed to his wide eyed gaze.

“Oh… wow…” He reached forwards and dragged his fingers slowly down your spine. “You feel the same as me.”

You turned and lay back on the clam bed to take the wetsuit all the way off and exposed your lower half to him.

His eyes immediate shot between your legs, staring at your pussy.

“Wow,” he breathed with awe, taking a good look at you.

“Can… I touch it?” he asked hesitantly, again, poising his hand over your lower half.

“Sure,” you said, propping yourself up on your elbows to watch him touch you.

His fingers were soft to the touch and you relaxed a leg out as his fingertips traced around your clit and over each of your pussy lips.

“God that feels good,” you thought as you watched him.

As he continued to gently explore you with his fingers you saw his cock slowly push out from between 2 folds in his tail and you looked over at it.

“Ooooh?” you hummed with a smirk, “well, if you get to touch me, then can I touch you?” 

“Touch me?” he asked, unaware that his excitement was now visible.

You gestured to his thick cock and he made a surprised sound, then chuckled.

“Yeah… go ahead,” he said, shifting around so you could touch him while he continued to touch you.

His girth was thick and you stroked him gently, just toying with his length as you mused to yourself about how human it was. You weren’t sure what you had been expecting- if you had even been expecting anything- but you had always assumed that it would be some kind of fish type organ… so this was a wonderful surprise.

“Hey uh… you can taste me if you like?” Kaminari offered, obviously enjoying your hands on his cock.

“Oh? Well… you can taste me too then,” you offered.

“Oh shit, for real?” he asked with delight.

You chuckled. “Where did you learn to talk like that?”

“I listen to how you humans talk and the girls say it all the time,” he replied, “it’s for real.”

“Not quite the right context, but good try,” you chuckled again, poking your tongue out then flattening it and pressing it to the underside of the head of his cock.

He paused to watch you take him in your mouth and his eyes rolled as his thumb slipped between your folds and pressed against your clit.

He just seemed to know how to touch you and the aching in your pussy increased as he wiggled his thumb a little then broke eye contact and looked down at your thighs spread before his eyes.

It was your turn to lift your head to watch him now and as he gingerly poked his tongue out and flicked the tip across your clit.

“Ohhhh,” you moaned, “that feels really nice on that spot.”

“Here?” he asked, bending his head back down to do it again.

“Yes~,” you moaned again.

“That noise sounds good, keep doing that,” he said to you- regarding your moaning.

You nodded and turned your head back to his dick then took the head of it into your mouth and swirled your tongue around it, not that it needed any coating, you were under water and everything was well lubricated.

“Mmmm,” he hummed deeply, his fingers working on you a little so that he could watch you suck and lick his cock.

Wanting to give him a good experience, you pushed more of him into your mouth and used your tongue to swipe over and around his girth, knowing your tongue would be a warm sensation against his slightly cooler cock.

As you focused on him, he went back to lapping at you and got into it a little more, using the flat of his tongue to lick all over and in around your pussy and clit, even pushing his tongue up inside you as best he could.

You spread your legs as wide as was comfortable to let him do his thing, hips bucking up towards his face occasionally.

“This is gonna sound crazy, but I honestly just want you to fuck me,” you finally said, pulling your mouth off his cock.

“What’s that?” he asked innocently, pulling his mouth off your aching clit.

“I want this” – you pointed to his cock that you were still holding in hand- “in here” – you pointed between your thighs.

“For real?!” he asked with excitement.

“Yes,” you chuckled, “for real.”

He didn’t need to be told twice and quickly flicked his tail to spin around and plant himself between your open thighs.

It was a lot easier being fucked by a merman. You could wrap your legs around the thick part of his tail and cross your ankles over his dorsum as he used his caudal muscles to hunch himself back and forth- making his cock slide back and forth inside your pussy while you kissed furiously and moaned into his mouth.

It didn’t take long for you both to cum and as he pulled out of you, you suddenly felt like you were struggling to breathe- a sensation similar to when you were running low on oxygen in your scuba gear.

“Kaminari?” you panted, “I… I need to get to the surface… quickly!”

He saw the look on your face and grabbed you, taking you back to the surface as fast- but slowly- as he could, he knew that rushing you to the surface after being at such a depth could cause the nitrogen in your blood to bubble (**true fact**) and so took the ascension slowly.

You could see the moon shimmering on the waters as you got closer to the surface but you were starting to black out and your vision shut down just as your head broke the surface.

Being half passed out, you didn’t know what happened in that timeframe and only came too when you felt the skippers rough hand around your wrist, pulling you out of the water.

“Ah! Yer must’ve gotten nitrogen narcosis, that,” you heard your skipper say as he dragged your naked body over and into the boat.

Slowly your vision came back and you coughed and gasped when you realized you were naked on the boat.

“‘Ere,” the skipper said, handing you an open towel, “I was wonder’in what’ad ‘appened t’ya.”

“Wh- what happened??” you gasped, coughing and wrapping the towel around you.

“There was a pull on th’line but then nuttin’ came up when I dragged ye back in! Y’was gone!”

“I?…” Slowly images of Kaminari came back to you and you clammed up, refusing to talk.

“Jes rest noe, while I take yer back in, I’ll give th’ ambulance a call, right? Thems’ll fix yer up.” He reached out at patted you on the head, just grateful to have you back alive.

~ END ~ 

**additional ending**

It was about 2 months later and you hadn’t been back in the water since. You remembered Kaminari clearly, and you knew what you had done with him… but you were also a little spooked to go back in. 

Your period was late too…

Concerned, you took a pregnancy test…

It was positive.

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Curiosity Satisfied (Part 2) – Merman!Adult!Midoriya x Human!Adult!Female!Reader >>>