#Mer!Katsuki | Explore Tumblr posts and blogs

mysicklove-main · 2 years ago

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Pairings: King Merman! Bakugou x Human! Fem! Reader

Word Count: 5.2k

Warnings: Just fluff.

Summary: You meet a merman one day and find yourself with your very own trading companion. You exchange gifts of the land and sea. The two of you were fine until Katsuki says he wants more from you.

𝐅𝐈𝐂 𝐌𝐀𝐒𝐓𝐄𝐑𝐋𝐈𝐒𝐓

Katsuki Bakugou gets everything he wants. The underwater kingdom is his, and whenever he wants or needs something, with a flick of his webbed hands, it appears. He is worshipped and maybe even feared by all of the seas. King Bakugou, the warrior ruler of the sea.

Except for a mate. No matter how many mers, both male and female, his court presents him with, he never feels anything toward them. His mother scolds him for not even meeting the young candidates, but he doesn’t give a shit. He gets what he wants; he will know if they are worthy just by a single glance.

So on some days, he forces his mother to watch the throne while he swims and swims just to clear his mind. He picks fights here and there with other sea creatures just to test his strengths. After he wins his battle against his third great white, he realizes he needs something stronger. Something to really pique his interest.

A human. Well, from afar, they look pathetic with their gangly limbs, but it is common knowledge to a mer that they possess weapons that can easily kill any creature of the sea. But this is Katsuki Bakugou we are talking about here. He isnt just some mer. He is the most powerful being of the sea. No one, including a human, could beat him.

So, the arrogant bastard took toward the surface to find the closest human. The water becomes more shallow, and not that he would ever admit it, but adrenaline fills his veins when he gets closer and closer to the shore.

Luckily for him though, a human was close. In the water, too. He was dreading trying to coax one into the ocean. Katsuki snickers at the strange limbs called legs kicking to try to keep the human afloat. It was so embarrassing for them. One flap of his tail, and he is yards ahead of them. It was incomparable the strength between the two species.

Without much hesitation, he grabs the submerged legs and pulls. They scream, of course, when they lose their precious oxygen and are surrounded completely by salt water. Their arms flail, and their legs continue to fight their way to the surface, but it’s all in vain. After all, this is Katsuki’s element.

Wanting to get one glance at the human before making a swift and easy death, he turns the figure around, and his eyes widen.

You were pretty. Prettier than any of the other mers he has ever seen. Even if your face is contorted in fear, he takes a second to admire your hair, eyes, and lips. They were all so cute. Exactly the way he likes them.

And your strength was actually impressive. Although you were no match for the king, you were definitely putting up some sort of a fight. He actually had to grip you tighter so you wouldn’t squirm away. Both of you knew it was a losing battle, but still, you really tried. You definitely had survival instincts.

As Katsuki gets distracted admiring the creature, you get one lucky hit and manage to kick him right in the nose. He hisses out and lets you go.

He could go out and grab you again easily but didn’t feel the need to. After that fight you put up, you deserved to stay alive. Stay alive, so Katsuki can meet you again.

You were just trying to take a dip in the ocean, really. After all the stress you have had this week, you deserved it. A nice relaxing day by the beach. You were not planning on almost getting drowned.

You swim swiftly toward the dock and yank yourself up before the creature tries to grab you again. You didn’t see much except for flashes of blonde hair, red eyes, and an orange tail. What was that thing? Some sort of fish? It just didn’t make sense. What fish could pull you down into the water? The beach was completely private, so it’s not like you could tell a lifeguard what happened.

You shiver and grab your towel before heading inside your beach house. You began to ponder, desperately trying to figure out what the strange animal was. After about an hour of research, you came to the decision that it was definitely a mermaid. Many studies have shown that they do, in fact, exist but are extremely rare to find.

It seems absolutely insane to you, but what else could be able to hold onto you like that? And that tail…It was huge.

You aren’t going to go near the beach for a while. Even so, though, you really did want another glance…I mean, seeing a real-life mermaid is crazy! Once little peep of the mermaid surely wouldn’t be a problem.

After all, curiosity killed the cat, but satisfaction brought it back.

Three weeks. Katsuki has managed to escape his royal duties to see your ass, and not once have you come back even close to the water. He has scouted the area over thirty times and found the small shack you call home. The mer lets out a scoff as he watches your shadow move back and forth inside the building.

He has thought about throwing something at the building but thought against it. He didn’t want you to think he was a violent maniac (even if he was) with your first real meeting. So, he boredly swam back and forth, waiting for you to come outside again.

He was in luck because at around 5 pm, you did finally open the door of your shitty shack and step outside. He quickly dove into the water to watch from below the surface. The last thing that he needed was to scare you back into hiding.

His eyes follow your figure as you walk toward and onto the dock that bridges into the ocean. You look nervous but determined, and Katsuki can see you holding something but can’t determine what it is.

Suddenly, your loud voice calls, “Hello!” over and into the water. You flush in embarrassment for doing something so silly. But you continue anyways, “If you are out there, mermaid, come over here!” It probably wasn’t the most convincing way to lead the visitor over, but whatever, you were desperate.

Katsuki smirks in triumph. He only knows very little of the human language due to his studies as a child. All he knows is that you greeted him and said the word “mer,” so you must be calling for him.

So he pops his head out of the water with a small smirk on his face. His orange ear fins are spread wide and on display. His scarred tail, from all the fights he has won, beats against the water as he watches you. He gently displays his sharp canines with his smirk. Like always, he looks like the strongest being of the sea.

When you take in his appearance, you scream and fall onto your butt.

Katsuki lets out a light bark in laughter, watching you fall. He couldn’t blame you; those strange limbs looked hard to use. If he were human, he definitely wouldn’t struggle, but he bets Denki or Eijiro would.

He puffs out his chest and made himself look as large and powerful as he could in the water. “Hello, I am King Explosion Murder or King Bakugou, ruler of the undersea.” He stood there waiting for the excitement or shock that usually comes from hearing his title, but nothing came. “Ruler of the undersea. Did you not hear me extra?” Judging from your frightened appearance, trembling on the doc, no, you did not understand.

And then he remembered. Of course, you don’t understand. He isn’t speaking in your tongue. To you, it must have sounded like a bunch of trills and clicks.

Katsuki opens his mouth to speak but growls. He doesn’t remember how to speak your language. It’s unnatural for mers to do it, but nobility are taught it, just in case. However, that was when he was ten, and he hasn’t practiced since.

Upon hearing his frustrated growl, you point your knife straight at him and threaten him. “S-Stay back! I have a knife, and I know how to use it!” You didn’t, but that was beside the point. You shouldn’t have come out here. It was a stupid idea. Curiosity did kill the cat, and you’ll need more than satisfaction to get you out of this situation.

The blonde doesn’t understand any of your words. The only thing he understands is that you are holding out a knife toward him. A gift! Already? Katsuki is known to be bold, but here you are, offering a courting gift on day one. I mean, it made sense, considering his physique. You must have seen how powerful he is and were quick to pounce. Eager, he likes it, and he can’t really blame you.

He huffs out pride and lets out a click in thank you. Then, quicker than lightning, the blonde snatches the knife from your hands and into his. He holds it up to admire it, unaware that you’re currently freaking out without your weapon to defend yourself. He scoffs at it. It was sharp but not even close to his very own canines. He turns toward you and pulls the knife up next to his teeth to show the comparison. He is once again unaware of how you pale drastically.

“Stay.” He uselessly commands before diving down back into the water, knife still in hand. You cock your head to the side in confusion at his disappearance, but realizing this is your only time to escape, you begin to book it down the dock and toward your home.

You don’t get very far. Katsuki, effortlessly fast, grabs your foot before you can return to the sand. You stumble forward and land on your knees, causing you to hiss in pain. A small scrape forms on your left knee.

He huffs in annoyance. “I said stay, you idiot! Look what you did!”

The loud growls cause you to tear up. This is it, isn’t it? He has got to be growling so much because his prey got away. It was a stupid idea, all of it. You were going to die, and nobody was going to find your body and–

Katsuki grabs your leg and licks the wound on your knee like he has done countless times with others during battles. After all, mer saliva has healing properties. Then as your eyes widen in shock, Katsuki pushes an orange sea shell toward you. He set in the water, just earlier for you. He lets out an annoyed bark when you don’t reach for it, and hearing the warning, you quickly scramble to take it. The blonde smirks in triumph and continues back to healing you.

You shiver when you feel the tongue back on your knee. It was like a cat’s tongue. The prickles gently nick at you. But, with all the courage you can muster, you tear your gaze away from the creature and onto the sea shell. It was light orange, and absolutely massive. Seriously, it was about the size of your whole hand. But, it was pretty and shiny in the sunlight.

You spare a glance at the blond, who is still completely focused on the task at hand. You could guess that he is trying to heal you for some odd reason. It made your heartbeat begin to return back to normal. Why would he heal his prey from such a minor wound if he was going to kill anyways? But why would he want you alive?

Then, you look to the right of him and see that in his hand, he is still holding the knife. Your eyes widen in realization of what is happening. “Trade! You want to exchange items with me. From the…human world?” The mer tears his mouth away from your skin and furrows his eyebrows in confusion. You point to the knife and then the seashell. “Trade?” You explain.

Katsukis eyes widen in understatement. So, the human word for “courting” is “trade”! Only a genius like himself would be able to figure that out so quickly. He lets out a soft grumble and nods his head. Then, realizing if this relationship is going to work, Katsuki has to tries to try and speak in your tongue. “Chr–aye-dd”

Your mouth falls open at the attempt of your language. The whole thing was absolutely insane, and now the strange creature is trying to communicate with you. This is a once-in-a-lifetime experience, so you continue speaking. “Yes, Trade! But say “Trr” instead of “Chr” You enunciate the sounds, so he understands.

Katsuki grumbles stubbornly when you correct him. Only his mother has been one to nag in, nobody else has the guts to do it, but here you are correcting him within the first greetings. You were bold; he had to give it to you. He also likes that. So, for your sake, he tries again.“Trrr-aye-d”

You laugh at this and smile gently. “Yes! Thats it! Trade.” You once again point to the knife and the seashell.

Seeing you smile, Katsuki lets out a trill and nods. Without much permission, the blonde rests his head on your leg, careful not to touch the wound. Then the hopeless mer begins to daydream. This was going perfectly! Not even one day of knowing him, and you have already allowed him to court you. Now, it was smooth sailing from here. He just needs to bring you a couple more gifts, and finally, King Bakugou will have his very own mate!

You, on the other hand, are freaking out a little bit. A merman is here and resting his head on your legs! Nobody would ever believe this was happening.

You tear your gaze away from him for a second and notice that the sun is almost down. Although the mer seems friendly as of now, you didn’t feel comfortable with him enough to stay with him during the dark. So, you try to gently get it up without disturbing him too much.

His daydream comes to an abrupt stop when you begin to move your legs. He groans in annoyance. “Stop.” He commands, which comes out in a small bark. You ignore him, considering you can’t understand him, and Katsuki slides back into the water.

He lets out a low growl, and your eyes widen. He wasn’t having second thoughts about this little exchange, right? So as you get to your feet, you quickly say, “Tomorrow, I will come back, and we can trade again. Okay?”

Katsuki looks scepitical. He only got out the word tomorrow and trade. Which definitely is a good sign, but does he trust you enough to keep your word? If he has to wait another three weeks, he is going to absolutely pissed. But then again, you seem to like him a lot if you already began wanting to court him on the first day of the meeting. Plus, you allowed him to touch you, once again, another good sign. You have got to like him.

So he sighs and trills a goodbye before swimming back down into the deep blue sea.

Katsuki Bakugou was adorable. It’s been about a week since you have known him and you have visited him every morning. He seems to be rather attached to you already. One day, you overslept and missed his meeting, and the next day you got an earful of mostly growls and barks. You thought it was adorable that your new friend missed you.

Currently, it was Friday, and exactly a week since you guys have been talking to one another. You learned his name and even have gotten him to speak in small sentences. He seems to pick up the human language very quickly. You wonder if it was a mer thing or a Katsuki thing. Either way, you praise him immensely, and he acts like he doesn’t care, but its obvious by the red ting on his cheeks he does. He also teaches you the language of merfolk. Your vocal cords don’t really do the barks or clicks justice, so the two of you continue to speak in your language.

Not only that, but the mer was heavily physically affectionate. It was hilarious, considering the fact that he would insult you on being a “weak human,” and then the next minute, would curl into your lap as if nothing had happened.

In all honesty, no matter how much of a brat the mer was, it has been one of the best weeks of your life.

“Human. Att–tention. Now.” The orange merman demands when you stop running your fingers through his soft blonde hair and stare off into the distance. You chuckle at this and continue to pet him. You are glad you taught him the word “attention” because before that when he needed it, he would take to softly biting you. You have small bite marks all over your leg because of the overgrown, needy creature.

A small, content smile falls on his face as he nuzzles into your legs. Courting has gone absolutely perfectly. You were gentle and warm but were able to put up with his shit. A perfect match the two of you are.

Of course, every once in a while, you do say some stupid things. “Katsuki, do you think I can meet some of your mer friends?” The merman looks up at you and gives you a familiar glare. You smile in return, hoping to encourage him.

It doesn’t seem to work because he lets out a cat-like yawn and closes his eyes again. “Friends, weak. Stupid,” He grumbles, and you roll your eyes.

“I bet we would get along considering you call me weak and stupid,” You remind, and Katsuki opens his eyes back again to glare at you.

He lets out a series of trills and clicks on accident before sighing and switching back to your language. “On–ly need me,” He challenges, and you give up the argument. Katsuki was as stubborn as a mule. If he didn’t want you to meet his friends, you won’t.

All of the sudden, Katsuki rolls off your legs and into the water. You tilt your head to the side, but the mer just grumbles out a, “stay.” and lightly bites your calf to get his point across. You, like always, flinch at the bite, but let him, knowing that denying him makes him even more upset. Besides, it’s probably a sign of affection.

Then, he dives back into the water, leaving you alone. A couple of minutes go by, and eventually, he pops his head back above the water. He raises his webbed hand and shows a squirming fish in his hands. You give him a questioning stare, but before you can ask, he plunges his sharp canines into the body. The fish dies immediately, and you’re left in shock at what the hell just happened.

He then offers the fish to you. “Eat,” He barks, and you shake your head, disgusted by the fish placed so close to you. Katsuki doesn’t like this answer, and he glowers at you. “Food. Eat. Hun–ted for you.”

Even if you are used to his demands, you are not willing to go that far for the sea creature. “That will make me sick, Kats. I can’t eat raw fish, but I really appreciate the offer.” Katsuki stares at you for a second and then, like usual, lets out a series of annoyed trills. He grabs the fish and quickly begins devouring it, bones and all, much to your horror.

Once finishes, he looks back up at you with a satisfied smirk. “Good Hun–ter.”

You nod in agreement, “Yes, you are a fantastic hunter Katsuki, way better than me.” He chirps and nods, preening at the statement. You roll your eyes and laugh at his behavior.

And then he sighs and, like usual, begins his goodbyes. He seems to be a very busy creature, only being able to meet for about two hours a day. You wonder what is taking up his time. Another mer? Maybe he has a family? But he never mentioned either of these things.

You don’t get time to ponder on it, because Katsuki rubs against your legs one last time before saying his usual statement. “Trade. To–mor–ow”. To which you nod and wave your goodbye with your new pink seashell that you add to your collection.

He nods before falling under the water and disappearing.

You begin to think more and more about Katsuki. Even if he was another species, you couldn’t help but be attracted to him. His muscular upper body, his soft blond hair, his piercing red eyes, and even if you hated the canines in the beginning, they are beginning to grow on you. Plus, he has the best personality. Although it is a little aggressive at some points, you know he has good intentions.

He is sweet to you, under all of the insults, and is exactly your type (well, if he was human). So, like a normal person of your age, you begin to daydream what it would be like, to be more than a trading partner with the strange, but enthralling creature.

It’s been about three weeks, and the two of you have been “trading” almost every single day. Things like forks, coins, small mirrors, and cups have been given away while you receive an abundance of seashells and old jewelry that has fallen into the sea. Katsuki goes out of his way to find the nicest items he can. After all, he is a king, and his mate deserves only the best.

Katsuki knew he was doing a perfect job courting you. You are happy with him, he provides for you semi-well (only because you won’t take his food), and he is a fantastic protector. Often times the red-headed shark tried to talk to you, but Katsuki manages to scare his friend away every time. He isn’t going to risk you falling for some other extra. You were way too eager to court with him (even if it did make sense considering his physical appearance), and he didn’t want to play the odds of you accepting some idiots advances. You were his, and he was yours. That’s how things are supposed to go. So, today is the day he was going to ask you to be his mate. Then, the two of you are going live happily ever after.

He leaves his mother on the throne, like always, and grabs the ring he has planned to use. It was gold, and he removed the previous gemstone and replaced it with a pearl he had found when scouting the area for any threats. He knows that rings are weirdly important to humans, so, it was probably a good idea to get one. Then, he heads to your guys’ meeting spot.

You were waiting at the dock with your feet in the water. He swims up to you and lightly traces his hand up the bottom half of your leg. Then, like usual, he lays his head on your legs. You smile and pet his hair, “Hey, Katsuki.” He lets out a small click in greeting.

“I brought you something,” You continue, and Katsuki’s ruby eyes look up at you, slightly intrigued. You always gift him the strangest things. You pull out a tennis ball, and Katsuki squints at it before snatching it from your hands. He then begins to assess it. He rubs his cheek on it, then bites it gently, and finally growls at it, just to make sure it wasn’t anything dangerous. Once completely satisfied that it was safe, he trills in thanks. In your broken language, he says, “Good gift. M–Mine better.” to which you chuckle and nod, not willing to argue with the guy.

He pulls away from your legs and back into the water. A second goes by, and he is back up above the water and smirking as confident as ever. Katsuki quickly reminds himself of the stupid human customs he is trying to follow. He has practiced this sentence about a billion times. He forcefully, and a little nervously, thrusts the gold ring into your hold. “I K-King Katsuki Bakugou, take you, Y/N L/N to be” He lets out a small growl in frustration when he forgets how to pronounce the last part correctly. “To be…my mate.” He puffs his chest out while he waits for the tears and your acceptance.

But much to his surprise, you begin to giggle as you grab the pretty ring. You admire it and praise him on how beautiful it was. You have never seen a ring like this, it was pretty. You place it on your pointer finger and smile. Then you pat his head lightly and say, “Yes that is how wedding ceremonies go! How did you learn those lines? And I love the addition of “king.” Great touch Kats. Actually, did you know that I happen to be the Queen of the human lands?”

Katsuki has never been more confused in his life. Firstly, you put the ring on the wrong finger. He read so many slabs that told him that you were supposed to place it on the one next to the pinky! Secondly, you didn’t even respond to the declaration. You just praised him on his abilities. Thirdly, you are a queen?! Would this mean that your two people can finally live in peace? This seems like the most important question, so he says, “You–Queen?”

You laugh once again and, this time, shake your head. “No. Sorry I was just teasing you, Katsuki. I couldnt help it since you said you were the “king” of the sea.” He furrows his brows. Did you think he was joking? He has left his people abandoned for you daily, and you don’t even believe him!

“I am King! You are my Q-Queen! Mate!” His newly learned language gets choppy when upset. He grabs onto the doc with his hands and looks up at you with a scowl.

You tilt your head to the side. “Mate?”

Poor Katsuki goes into another hissy fit. He growls and grumbles, and you furrow your eyebrows, used to his dramatics. You don’t know exactly what’s pissing him off, though.

You are pissing him off. You guys have been “trading” for two weeks now, and you don’t even know what mates are. What do you think these entire interactions have been about? “We trade. Now we mate.”

“Like animals do?”

He uses his tail to propel him above the water. Now he is almost your height when you are sitting down on the dock. He only does this when he really needs your attention. The scowl has deepened, and this time, you do flinch. “Like mer do!”

Was Katsuki joking? About the king and the mating thing? You have never heard him joke before, but also, what was he talking about? You guys originally were trading items, and now you guys are friends. Did you confuse him somehow?

Your thoughts were suddenly cut off when Katsuki leans forward and pressed his lips onto yours. They are wet and a little salty, but still soft. You are just glad that you can’t taste fish on his lips. Your eyes widen for a second, but then gently kiss back for a second, and Katsuki pulls away. Red tints his face, and you probably match his furious blush. “S-See! Mate.”

Oh. So this entire time, he has been wanting to get with you? You use your hands to cover your face in embarrassment, but Katsuki is quick to remove them with a short but scolding bark. “We trade. Now we mate.” He repeats.

You realized that you confused him this entire time. He misunderstood your definition of trade. “You court and then mate. Not trade Katsuki. Trade is when you exchange items, like merchants do.”

Katsukis face contorts into disgust. Like the lower-class people? He is a king, for christ’s sake! How did you think that he was trading with you like some lowly extra? He didn’t need your useless items (yes, he did, he actually loves them all)! He lets out a series of growls and barks in the mer language at your misunderstanding. Finally, he, in your tongue, says, “Stupid human!”

Although you haven’t known Katsuki for that long, you know is not mad specifically at you, just upset. I mean rightfully so; you have misunderstood his attentions this entire time. You have got to make it up to him. So, you lean over and tilt his chin upward toward you and cut off his growls with a soft kiss. He, of course, shuts up and kisses you back intensely.

He hates craning his neck to kiss you, it makes him feel small, and he is the strongest creature under the water; he should never feel small. So without much hesitation, he grabs onto your figure and pulls you into the water.

You screech in surprise as the cold water hits you, and Katsuki grins. He presses his lips against yours again and effortlessly holds you above the water. Eventually, you pull away with a trail of salty saliva. “You are going to have to recourt me.”

Katsuki frowns as his face fins pin straight back on his face. “Why?”

“Because I didnt know you were trying to courting me. I want to enjoy it this time,” You hum, and Katsuki flicks a tad bit of water into your face. You scrunch your face up and whine, and Katsuki laughs low.

His orange tail flicks into the water. “Idiot human.” But, he still nods in agreement. It wasn’t like he was going to force you to be his mate. If needed to be, he can wait.

Your smile turns mischievous. “And you have to court me like a human does.” This time Katsuki does growl in annoyance. Human ways are so tedious.

“No.”

“Awe I guess I just got to find a human “mate” to court me….” You fake pout, and Katsuki grips you tighter. He can see right through your bluff, but pissing you off right now in such a nice moment does not seem like the best idea.

“Fine.” You give him a peck on the lips for his compromise. He in return, grabs your hand and replaces moves the ring from your pointer onto your ring finger. He lets out a satisfied click with the new placement. Now both mer and human will know you are his.

As you watch Katsukis ministrations, you think back to what he said earlier and hum in thought. “Hmm and Kats you were just joking about being a king right?”

Katsuki laughs mischievously and a little arrogantly. Your eyes widen at the response. “Right, Kats?”

“Nope.”

You squirm in his hold, but he wraps his tail around you, preventing you from leaving. “I can't be the ruler of a kingdom that I’m not even from! Plus I'm not even a mermaid!”

But Katsuki was already lost in thought, daydreaming once again of the future. Besides, there are many ways to get you changed into a mer, it wasn’t hard. “King and Queen Ex-plo-sion Murder. The most powerful mates of the sea.”

“Katsuki!”

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mysicklove-main · 2 years ago

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Pairing: Mer! King Bakugou x Mer! Queen Reader

Word Count: 5.3

Warnings: Fluff! Possessive behavior. Biting lol. Female! Reader

Summary: Katsuki convinces you to change into a mermaid.

𝐅𝐈𝐂 𝐌𝐀𝐒𝐓𝐄𝐑𝐋𝐈𝐒𝐓

Courting a human sucks. It is all sugar-coated, a bunch of nonsense to try to appease the other. The way mers did it was simple. Show potential mates you can provide with gifts and food, and make sure your bodies are compatible. Of course, Bakugou hasn’t gotten that far with you and his face heats up whenever he thinks about it. But in the less dirty sense, he knows you find his body attractive and your body was equally as perfect.

So yes, the king should be done with the whole courting thing. It’s been about a month now and you are still frustratingly human. You haven’t given in to his antics.

You haven’t accepted the blonde because frankly, you are absolutely terrified of being a mermaid. Sure, you didn’t have much family nor friends to leave behind, but still, it was a whole new world. You weren’t sure if you were mentally prepared for that.

“You. Pretty,” The mer at your feet huffs, frown still on his face, contrasting the compliment. From his research, he decided that humans like compliments.

“Yeah? Thanks, Kats, but you have told me that ten times today.” He trills in annoyance and uses the tip of his tail to splash water at you. You squeal but giggle at the cool water that falls upon your face.

He grips your left leg and presses his face to your calf. “Mate now?” He asks, just as he had done for the past couple of days. He then begins to gently nibble on any skin he can lay his teeth on. You give him a sharp glance, warning him to be gentle. Your legs are already littered with bite marks thanks to a certain someone. He rolls his eyes, but abides, not wanting to piss you off.

Once satisfied with the mer you sigh. “Yknow, human courting is more than just giving compliments.”

He lets out an overdramatic growl and you raise your eyebrows. His orange face fins fall flat against his head. “Human ways stupid,” He hisses and you roll your eyes.

“Forgive me King Bakugou, ruler of the sea, for being a human,” You tease sarcastically and he glares at you. You smile and reach to pet his hair, he grumbles but leans into the touch. “Alright, I have seen that you tried. I'll be your mate Katsuki. Just give me a week to you know–prepare to be a mermaid?”

He pulls away from your leg, eyes wide. He almost seems to be happy, but of course, knowing Katsuki, he wasn’t about to show it. So, instead, he barks a complaint, “Too long. Now!”

You gently push the tip of your foot onto his forehead, forcing his head to tilt back. He bares his teeth at you, but doesn’t move from the position. “A week. Keep complaining and I won’t be going at all,” You threaten and he narrows his eyes at you.

Sometimes, Katsuki was demanding. It was fine in most cases, but if you sit there and take it all the time, it will definitely go to his head. You are not one of his subjects to boss around.

So, alas, he moves away from you and nods with a huff.

He swims back up to the dock and uses his tail to push himself out of the water, as he has done countless times. He rests his forearms next to your legs, successfully holding you still. He is slightly shorter than you in the position, but still way more threatening out of the two of you.

“Kiss?” He asks, but it comes out more like a demand.

Nevertheless, you are happy to oblige, and you swear you could see a small smile on his face when he presses his lips to yours.

When Katsuki heads home for the day the last thing he wanted to see was two idiots in his court.

“Did you see when she pressed that strange thing on his forehead?” The blonde-haired, and yellow-tailed, mer trills. He stares curiously at the figure above the water that is walking away.

“Yeah, and Bakugou didn’t even try to bite it off! He is totally whipped.” The red-headed shark, who looks almost exactly like a mer, excluding the extra large fin on his back, says in return. The two are so close to one another that they look like two schoolgirls talking about their crushes. They don’t seem to notice their king’s presence.

Katsuki, suddenly grabs the two of them by the back of their necks, causing them to jump. He has a murderous smile when talking. “And what the fuck are you two idiots doing over here?”

The two eye each other and smile sheepishly. “Just you know. Looking for our king!” Eijiro, the braver out of the two says enthusiastically.

“And new queen,” Denki half mumbles and Katsuki eyes him suspiciously. He can’t help but like the way it falls from one’s mouth though. But, the larger mer refuses to say that out loud, so instead he growls and drags the two away.

Then, he begins planning for your arrival.

Today was the last day of you being human. You sigh and go through your items, wondering if you’ll ever need them again. Becoming a mermaid is a life change, obviously. So, you were struggling just a little.

You got rid of most of your stuff, but you were hesitant about removing them all. If going with Katsuki didn’t work out, would you be able to come back? You had to ask later.

So here you are, walking out of the small shack you called home. You approach the dock with only a bag full of the mer’s gifts during his courting process. You couldn’t imagine leaving them behind.

Katsuki is at his usual spot, peaking his head above the water. A pink figure is next to him. Your eyes widen, in the six weeks you knew the mer, he has never introduced you to anyone. This had to be the person changing you.

You gulp, but a familiar bark calls you over. You smile nervously. “Hey, Kats. Who’s this?” You take in her appearance. Bright pink hair, skin, and tentacles. An octopus. You have never seen one that looks like her. She was beautiful.

“Mina. Friend. Ch-Change you.” The octopus tried to talk but it comes out as strange gasping and gurgles. You could tell it was the mer language but was definitely a little different considering it was coming from an octopus. So you just smile and wave at her.

She smiles so wide in return and you begin to feel a little comforted. Mina grabs at your ankles and begins to continue talking in the language you cannot for the life of you understand. You look toward Katsuki for help, a little afraid that she might drag you in. She looks nice enough, but she is a sea creature. You don’t trust them completely yet.

“Look at her tentacles Bakugou! Only two of them. How weird!” Katsuki rips her hand away from your body and growls at her.

“Watch it. That is your Queen that you dare to touch without my approval.” Mina shrinks her hand away and nods hesitantly. She totally forgot how important you are.

The octopus tries to do a curtsey, but it looks more like she just submerged more of her body in the water. Katsuki huffs and nods while you look at her confused. “Katsuki what is she doing?”

“Showing Re-spect. Queen.” You look at him wide-eyed. You were not going to get used to this.

“Oh. Um, thank you?” Mina has no idea what you are saying but continues to stare at you with stars in her eye. Unknown to you, but she has been waiting for the day the blonde finally chose his mate for years now. You laugh awkwardly.

She grins at the sound and turns toward the king who is wishing this process went a lot quicker. “What did she say? Tell me Bakugou!”

He rolls his eyes. “She says thanks. Now can you get on with it?” She nods, used to the blonde’s behavior, and beckons Katsuki to grab for your hand. He holds his hand out to you, and you take it. He begins to lead your hand to the octopus but stops.

You begin to tremble, nerves getting the best of you. Katsuki looks at you, eyes furrowed with concern. He quickly scans the area. “No danger. Don’t be afraid. Protect you. Promise, mate.”

You smile at the reassurance but it doesn’t help. It wasn’t like you didn’t want to be a mermaid, but this once again is a huge change. Your whole world is about to do a 180.

You don’t know how to phrase this any nicer, but you have to get it off your chest. “If I…If I want to go back home, as a human. Will I be able to?”

Katsuki grimaces. He had to admit that question hurt, but it was reasonable. Mers may mate for life, but humans don’t. After a while would you leave? Would he let you leave him? He didn’t like pondering such nonsense things.

But, for your sake, he turned to Mina and translated your question. She takes a second to think about it but nods and explains how easy it is to reverse the spell.

He feels hesitant about telling you this. “Yes. But–Don’t leave. Stay. With me.” Katsuki pauses, looking up at you. He huffs. “Please?” He has never asked for anything in his life, and if anyone in his court heard this they would be flabbergasted.

This is also the first time he has also said please to you. You smile and run your fingers over his webbed ones, and nod at him reassuringly. “Wasnt planning to. Just wanna keep my options open. Just in case, yknow, something bad goes wrong.”

He, like usual, grumbles, but he does understand. You’re smart. Thinking about how a situation could go bad, and how to keep yourself safe. Things queens should be thinking about it. So, although it feels wrong instinctually to agree with you, he can’t help but feel a little prideful at your statement. “I un–understand. But, nothing go wrong.”

You chuckle at his statement, but don’t disagree. You hope nothing does go wrong. You hope that the two of you will stay together forever while you are down there.

Mina gurgles, annoyed that she can’t understand what you guys are talking about. Katsuki clicks at her sharply and she rolls her eyes. Then the mer brings your hand onto hers. You gulp. “Ready?” He barks.

“As I’ll ever be.”

Your vision begins to fade, and the last thing you see is Katsuki grinning, canines hanging out of his mouth that looks almost animalistic.

When you awake you are underwater and breathing it. You of course panic when your first wake up, but immediately remember.

You begin to take in your surroundings. You are in a dark sort of cave. It’s hard to see much, but you are very much alone. It unnerves you. Where the hell was Katsuki?

You begin to move but forget about your new appendages. You quickly turn around to get a look at your tail and gasp. It was pretty. A light green, with glittering scales that are not that exciting in the darkness. But still, you could tell it was beautiful. It was definitely smaller than Katsuki’s massive orange one, but definitely still large.

You put all your years of playing mermaid in the public pool into the effort at this exact moment and suddenly, you are swimming. Not fast, of course, considering you are definitely confined into a small space, but definitely something. You smile wide and swim in circles, twirling around, fulfilling your childhood dreams.

Suddenly a noise startles you out of your thoughts. You freeze and quickly duck low, hiding from whoever it was. Chances were, it was Katsuki, but you aren’t willing to risk it.

“I don’t know man, this seems like a bad idea. Bakugou is going to kill us if he sees us.”

“Just one peek. It will be fine, Kirishima, stop being such a guppy. We will ask her not to tell him we were here!” Eijiro looks over toward the blonde mer, and nods hesitantly. He begins to drag the shark toward the end of the cave.

Suddenly, a rock is thrown at them. Not hard, considering you are not used to the dynamics of force in the water, but definitely still there. The shark jumps and looks at you in shock. “M-My Queen.” The two strangers bow at you and you grab another rock.

“Who are you guys? And where is Katsuki?” You hiss, green face fins spread in alarm. The two look at you in shock.

The yellow-tailed mer is the first to respond. “How…How can you understand us? Didn’t you just transform?”

You begin to lower the rock in confusion. Then it hits you. You weren’t using your vocal cords the same as usually do. You were clicking and trilling at them. It was instinctual, you didn’t even know you were doing it.

Another figure appears and you hiss on instinct. When you do so though, you immediately cover your mouth, eyes wide in shock.

“I did it!” Mina says with a smile and swimming up close to you, way closer than normal personal space. She grabs your hand and begins to assess it. “I gave you something that helps with understanding mer linguistics. I just couldn’t wait to talk to our new Queen!”

“Does the king know?” Eijiro says eyebrows pinched in concern. He knows that Katsuki doesn’t like doing things without his approval. Especially stuff involving his new mate. That’s why if he and Denki were found out, they were fucked.

“Well, no! But he will be happy! Anyways, what are you guys doing in here? I am making sure the transformation went well.” She turns back to you and runs her hands over your face fins. You flinch at the strange feeling. “My Queen, can you please open your mouth for me?” You abide, and she begins to count your teeth and checks your canines.

Kaminari swims closer to the octopus. “We wanted to take a look! Bakugou really scored, huh? She is so pretty and–”

“I’ll ask you guys again. Where is Katsuki?” You hiss, cutting the blonde mer off. You weren’t trying to be rude, but you were overwhelmed, and the fact that he is not here when you are so vulnerable is upsetting you.

“Demanding! Perfect for a ruler!” He responds, a smile on his plastered on his face like he was used to being treated like this.

“He is hunting for you, my Queen.” The large shark, you were most wary about says, with a soft reassuring smile on his face.

“Y/N. Please, all of you call me Y/N, all this “my Queen” talk is throwing me off.”

They all look at each other hesitantly, wondering how exactly Bakugou will feel about being on a first-name basis with you. But, you were their queen, and this was your first command. So they all nod at you. “Of course…Y/N,” The blonde mer says and you smile. “Im Denki and this is Eijiro. And of course, you met Mina. We are part of King Bakugou’s court.”

Mina lifts your arms up and moves them around, humming to herself. “Anyways, don’t worry, he will be back soon. These two idiots aren’t supposed to be in here but don’t be afraid they are harmless.” The two grin at you at her statement and you return the gesture.

Suddenly, there is noise at the entrance of the cave. Mina drops your arm instantly, and moves to take a peek. She gasps and quickly turns her shocked gaze toward the other two. You watch the boys’ faces pale drastically.

Eijiro quickly stutters out, “M-My King….You are here–” before the two of them are pinned to the floor, held down by the backs of their neck. You gasp and Mina sighs, knowing this was going to happen.

“What the fuck are you two doing in here? I should banish you. Coming in here on my sleeping mate, your Queen, without my permission,” He hisses out, face fins spread wide, pupils constricted, and claws digging into their necks, causing the two to wince. “No, not banish, I should kill you guys for–”

You let out a small yelp, shocked by what the hell is happening. You have never seen Katsuki angry before, and now he is using full sentences to threaten to kill people. His very own subjects! It made you think about what he could do to you.

That’s not even talking about his appearance. He looked animalistic. Like he really would see his threat through. You didn’t know if you really were cut out for the world under the sea.

Katsuki whips his head toward you at the sound, and his eyes widen. He takes in your very much shaken appearance, trying to hide behind Mina. He of course didn’t mean to scare you. He assumed you were still asleep. “Out. All of you. I’ll deal with you later. Now!” The three quickly scamper out of the cave, leaving you alone with the king.

He sighs and rubs at his face. He swims up to you, but instictually, you flinch away due to his appearance. His eyes slowly contract back to usual and his facial fins relax. “Sorry. Sorry. Don’t be scared. Will not hurt you. Sorry. Mate. Protect.” He using your language again. It’s a little muffled under the water, but understandable.

But what really shocks you was how desperate he sounds. He really was afraid that you were scared of him. It made your heart throb. You have to think about it, but you speak in your tongue. “It’s okay. I’m okay. You shocked me a bit, but I’m not afraid of you Katsuki.”

He gently grabs onto your arms and this time you don’t flinch away. He sighs and hugs you. Katsuki mumbles, “Those fucking bastards.” In your neck and you laugh.

“I like them. Eijiro freaked me out at first, but they seem nice.” He jumps and pulls away from you, holding you not at arms length.

He furrows his eyebrows at you, confusion written all over his face. “What? Speak.”

“Um okay?”

“What the fuck? How the hell can you understand–Mina. That idiot! I knew she would somehow ruin this.” He pinches the bridge of his nose and you laugh.

“What’s the big deal? This is a good thing. You now can use full complex sentences. It’s honestly kinda weird, but now I can understand you more, without the growls and grumbles,” You reason and he looks away from you, a small blush on his face. He mumbles something under his breath. You hum in question.

“Nothing. I just–Whatever doesn’t matter.”

You cock your head to the side. “C’mon tell me, if I am to be your mate I have to understand what’s going on in that hard head of yours.” He rolls his eyes at your grin.

Katsuki mumbles out, “Didn’t want you to learn it yet.”

You furrow your eyebrows in confusion and then bring back the teasing. “Why? So you could be the only one to talk to me?” You smile and lightly tug on the two orange fins attached to his face.

He blushes and turns away from you. You have your answer. A laugh falls from your lips and he growls in embarrassment. “You possessive little shit! How would I be able to rule a kingdom without speaking your language?”

“I would teach you the basics. You could ask me to translate the rest.”

“With your fantastic English speaking?”

“Fuck you! I’m fantastic at speaking it, better than you.” You laugh at his cocky statement, and his eyes fall to your tail.

His grumbles stop as he stares at your tail. He runs his claws over it gently, admiring it. You stop your laughter to follow his gaze. “It’s pretty. Smaller than mine. It fits you. I knew you were destined to be a mer.”

You smile at him. It was rare for Katsuki to speak so gently with you, so you were soaking it all in. But, you turn the conversation back to what’s important. “You scared me earlier.” He scowls, remembering your terrified face, just a couple of minutes ago. “When you weren’t by my side when I woke up.”

His ruby eyes scan your face. “I was hunting. I was with you every second for the past week. If I didn’t I would most likely starve to death. I don’t know why the hell you woke up the one time I was gone. It’s your fault.” You give him a glance that said, really? at his ridiculous answer and he scoffs, giving in immediately. “Sorry. Didn’t mean to scare you.”

“It’s alright.”

He nods before he leads you over to the stone ledge covered in seaweed that you awoke on. “Rest. You just shifted. Mina says you should be sleeping. Can’t have you die on the first day of being a mer.”

“Die?!” You screech and Katsuki laughs mischievously.

“Im fucking with you. I didn’t dedicate six weeks courting your ass just for you to die. Sleep. Now.” You use your new appendage to hit his stomach at his teasing. But, you’re not used to your new strength, so you accidentally hit him way harder than you meant to. He winces and falls forward, having the wind knocked out of him. Your eyes widen and you spit out apologies immediately.

“Pretty and strong. Perfect.” He wheezes and you laugh nervously, fretting over him. He just pushes you back down on the slab, mumbling how he alright. He then curls up next to you and begins to lull you to sleep.

Two weeks go by, and now, officially you are Katsuki’s mate. Two nights ago it became official, and the both of you have bite marks on each other’s necks.

The one on yours is huge, he didn’t even try to make it hidden. It’s right below your ear, and no matter how hard you try, it will be shown to everyone. Possessive bastard.

Katsukis is a lot smaller, you were hesitant about biting him in the first place, so you placed it near his collarbone. He stopped wearing jewelry so that it could be shown and you swear he goes out of his way to crane his neck to display it when talking to someone. It was ridiculous.

But, other than his antics being queen honestly hasn’t been that hard. His court loves you already and his mother absolutely adores you. She saw you once scold Katsuki for being mean to one of his subjects and fell in love immediately.

You live in a palace. It was absolutely massive and was made out of gold. Katsuki says it has been here for hundreds of years. It was completely different than your beach shack, but you were growing fond of it.

Katsuki’s room is definitely very…Katsuki. It was more like a cave in all honestly. He says he likes to go with his roots. His instincts. Mers originally lived in caves after all. You have done some touch-ups to make it more home-like, but kept it the way he likes.

The gifts the both of you received hang upon the walls. It was a little strange to see a tennis ball held in such a protective case, but you didn’t say anything, not wanting to hurt his feelings.

Currently, you were talking to Eijiro as you were swimming to the dining room. You have slowly convinced Katsuki to actually eat in the dining room with the rest of his court, instead of bringing dead fish back in his mouth like a wild animal.

He agreed but forces the chefs to make his and your meals the fish he hunted. Everybody snickers about it behind his back, but nobody has the guts to say anything to his face.

Surprisingly, you actually enjoy eating fish. It took a couple of days of getting used to it, but it was a lot better when the chefs prepared it. You had no idea how they made the sauces for it, considering you guys were under the sea, but you knew you probably didn’t want to find out.

“And then we helped the guppy find his parents!” Eijiro clicks, snapping you out of your daydream. He was telling you about his day guarding the city.

You smile at him. “How sweet. I’m not surprised, you are a great soldier.” He grins at you and nods. The shark seems to have taken a liking to you, considering you don’t shit on him constantly like Katsuki does. You don’t mind. It was nice to have friends, you didn’t have many on the surface.

Suddenly the door behind you opens and the two of you turn toward it. Eijiro, like always, bows low in greeting. You smile.

Katsuki swims over toward the two of you, with the usual scowl plastered on his face. “Why talk to him?” He grumbles, not liking that you are alone with the shark. He knows nothing will ever happen, but still, it was annoying that he has so many kingly duties that he doesn’t get to spend as much time with you as his court does.

You rephrase his statement. “He asked us what we are talking about.” The shark nods and Katsuki looks at you like you slapped him. You cock your head, confused.

“Don’t trans–late. He is idiot.”

“You know he is a member of your court.”

“Our court.”

“Yes, our court.” He nods in triumph and you sigh, but smile. Katsuki has been going out of his way to talk to you in English. He likes the idea that only the two of you can communicate with one another like this.

The blonde swims up to you and presses his lips to yours, without a warning. Eijiro lets out a disgusted noise, before turning away and heading to the dining room by himself.

“Really?” You sigh when you pull away. He grins mischievously and grabs you by the hand, before leading you to the dining room.

Upon your entrance, your court “stands” from their chairs. They all bow and simultaneously say, “Greetings to His and Her Majesty.”

You smile and wave at your new family, you manage to get a small wave back from Denki. You still aren’t used to the whole dramatic greetings. Katsuki just nods in approval.

Katsuki sits at one end of the table, and you sit at the other. You actually hate doing this, you much rather sit next to one another, but it was important for the king and queen to also show respect.

You receive your custom-made meals, and your mate grins from across the room. “Salmon. Good.”

“Thanks, Kats.” You smile warmly at him, knowing he takes immense pride whenever he has “provided” for you successfully. He huffs but uses his hand to wave the thanks off. Denki has to hold back a laugh.

The others receive their meals and begin to indulge themselves. You are the only one who uses silverware, but you don’t mind, you are now used to the way merfolk eat. The first day it almost gave you a heart attack watching them viciously tear into the fish.

You talk to Mitsuki for most of the meal and occasionally join in Mina’s conversations. Katsuki talks to Eijiro most of the meal, but the two of you make eye contact multiple times. You always smile at him. It was a nice dinner. It always was.

You really love it here. Everyone is so kind to you. Being a queen is not too hard, but that is simply because Katsuki is really good at being a king. He is respected by everyone, so naturally, as his mate, you are too. Plus you haven’t had to make any life-changing decisions. Katsuki did that for you, and you were grateful. You didn’t have much experience ruling people.

Dinner ends uneventfully and you dont mind. The routine is nice. Katsuki leads you back to his room. It was the first time you have seen him all day besides dinner.

The day ends with just the two of you. You lay facing one another, and Katsuki runs his fingers through your hair. He kisses the bitemark on your neck. He then murmurs, “My Queen.” into your neck.

“Hmm?”

“Just like saying it.” You laugh lightly.

You sigh and look toward the stone ceiling. “It’s weird. If someone told me that I would be a ruler a year ago I would have fainted.”

He grins, canines on full display. You remember when they used to freak you out. Now you can’t help but love them. “Would you believe that you are mated to the strongest being of the sea?”

“I think you mean the most arrogant bastard of the sea.”

“Don’t act like you don’t love it.”

You roll your eyes and switch back to your native language. “Mated to a man who thought courting meant trading. What a strange thing.”

“Your fault! Dumbass!”

You grin at him. “How was that my fault? You really thought I was coming onto you that fast?”

He grumbles to himself. “Wouldnt be sup–rised. Happened before.”

You fake gasp. “Don’t tell me. Have you been trading with other mers before you met me? I’m wounded Katsuki!” You knew the answer to that, having heard him multiple times tell you that he only had eyes for you.

“Yeah. Traded with many mers. Way prettier than you.” He nibbles on your jaw, a sign of affectionate teasing. He has also told you multiple times in high dramatics that he was “mated to the prettiest being of the sea.”.

You laugh and continue the joke. “Don’t worry, I understand. I “traded” with tons of other human men too.”

He growls and runs his teeth over the mating mark. “Joke over.”

You pet his head, still grinning. “Who said I was joking?” He looks up at you, squinting at you and frowning. He can tell by the look on your face that you are lying.

He quickly switches tactics to lightly gnawing on your skin, earning squeals from the ticklish feeling. He pins you down to stop your squirming. It doesn’t stop your hysterical laughing. “Stop! That tickles! Mercy! Katsuki!”

“Say it.”

“Say what!?”

He stares at you. “Fine! Fine! I have only traded with you!”

“And?” The mer prompts, as he moves to your stomach to lightly bite it. You continue to squirm, but you know what he wants you to say.

“And….Katsuki! Im going to pee myself! And I am so happy to be mated to the strongest being of the sea!”

“And?”

“And what?!”

“You know.”

“And I love being Queen of the sea! And I’ll never turn back human!” He releases you with a grunt and you begin to pant, trying to regain your composure.

He didn’t mean to get you to say that last part, but he can’t help but feel an immense amount of joy from the words. He is afraid you’ll get sick of the life of a queen. The reassurance helps.

Once you calm down, you glare at him for torturing you. “I am going to kill you Katsuki Bakugou!”

“With those little fangs? You can try.” You pounce on him immediately and the two of you twirl in the bed. He laughs and growls playfully at you. Katsuki barely lets you win. He smiles when he feels those dull claws, compared to his, pins him against the bed. He will let you have this moment, especially after what you just said.

The poor servants were left red in the face when they passed your door, hearing the thumping, growling, and squealing coming from the King and Queens bedroom.

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