Misuse of Power (Yandere My Hero Academia x F!Reader Oneshots)

"I've been in love with you ever since we were kids!"

I love Monoma sm, y'all have no idea.

Pairings: College Student!Monoma Neito x Reader / College Student!Kaminari Denki x Reader / College Student!Mizushima Masaki (Manual) x Reader

WARNINGS: Yandere themes, light suggestive content, marking (in Monoma's), swearing

Summary: Your childhood best friend and classmate has been in the friendzone since diapers and he's finally had enough of it.

Notes: These are separate headcanons for each of the 3 characters. This is a college quirkless AU. Let me know if you want this prompt with more characters.

MONOMA NEITO

Monoma wondered every day what it was that kept you from loving him.

Your crushes weren't TOO far off from being like him, but there had to be SOMETHING missing if you never chose HIM as your crush. So what was it?

You never liked when he bullied Class 1-A back when you were in high school, but he'd stopped in your third year and never did anything in college. Well, sure, he could be salty towards others and still had a cutting tongue and passive aggressive attitude, but you still stuck with him-

It was a movie night and those were simultaneously the best and the worst hangouts you have with him. You were snuggled up SO close to him that he could hear the beating of your heart- the heart that should belong to him.

Did you know what you did to him when you leaned against him like this? Did you know how much he wanted to wrap his arms around you and press his lips to your forehead? To your neck? To your own lips?

God, he loved you so much... and after all these years... how didn't you feel the same?

He didn't even realize what he was doing until he did it, his teeth sinking into the soft flesh of your neck, a groan surfacing in his throat as he gave into a temptation he'd always had.

You yelped and he let go immediately, surprise and shame flooding him. But at the site of the reddening bite on your neck had heat pooling in his gut. His arms tightened around your body like a noose, his head ducking down to mark up your neck again and again, ignoring your squeaks and pleas for him to get off.

"Wh-why?" You asked, eyes blown wide with apprehension when Monoma's glazed-over eyes met yours.

"I've been in love with you ever since we were kids! How did you never see me? Why did you never see me?"

You tried to apologize, trying to ask if you'd led him on somehow. Monoma had stopped but he wasn't letting you go. Instead, he sighed dreamily and rubbed his cheek against the top of your head lovingly.

He's waited two decades for this, let him have this moment.

KAMINARI DENKI

It's hard to remember just when Kaminari went from "girls have cooties" to "(Y/n) is really pretty" to "I like (Y/n)" to I like like (Y/n)" to "I would give my life to have a chance with (Y/n), I love her so fucking much."

He would do anything to get just an ounce of your love. ANYTHING.

He followed you around like a duckling follows its mother, eyes practically heart-shaped, and a lovesick expression written all over his face.

You probably thought "that's just how Kaminari is", since he'd been like this for years. But he wasn't that way with other people... only you.

Sure, he'd made a few jokes in ill taste with Mineta in high school, ones you were clearly not pleased by, but you were always the one on the front of his mind. Maybe that's why he chased after other girls a lot of the time. Other girls he had a chance with. He had a 0% chance of getting you.

But he wanted you. Oh, God, he wanted you... You were so close, yet so far away...

You looked so tempting, biting your lip in concentration. Kaminari's golden gaze was locked on your lucious lips, not his homework, which was supposed to be his main focus right now.

Go for it. A little voice whispered in his ears. Kiss her. Take her for your own.

Kaminari was the kind of man to take advantage of an opportunity, not to mention he was extremely impulsive at times. For better or for worse, that's what drove him to smash his lips against yours in a passionate kiss.

Your eyes were wide and you tried to pull back, but Kaminari's hand shot up to clasp the back of your head, deepening the kiss with a low moan.

When he pulled away, panting and licking his lips in a desperate attempt to capture every little bit of your taste.

"I've been in love with you ever since we were kids!"

Your face fell and so did Kaminari's heart. Before you could turn him down, he pulled you into another kiss, trying to swallow up your protests. His hands felt blindly across the floor, unzipping his backpack and shuffling through it.

He removed your hands from his chest and quickly tied them in the bit of rope he kept in his backpack. The rope he saved for whenever he was ready to keep you with him forever.

And, as he looked at your swollen lips and angry expression, he decided he was ready.

MIZUSHIMA MASAKI (Manual)

Mizushima was used to being considered a "guy best friend".

He was average in almost every field. In fact, even average people would probably call him "plain". The only thing that said him apart was his submissive nature and tendency to become anxious- afraid he may have rubbed someone the wrong way or that something he said came out wrong.

You were so understanding and reassuring... You made him feel more confident and happy... You were beautiful and kind, all at the same time.

He had fallen in love with you in junior high and had followed you to the same high school and university. He only applied to one college, after all.

You were the only thing that mattered to him, he put you above everything else in his life. And yet, you saw him as nothing more than a friend.

You wouldn't expect such a plain, average joe such as Mizushima to have such a dark secret. Such an unholy obsession that consumed his every waking, and even sleeping, moment.

It was all to easy to invite you over and just as easy to show you his "surprise" in the basement. If you thought you were getting an early birthday gift, you were, most unfortunately, wrong.

While you screamed your throat hoarse for help, tugged your hands raw on the iron chain, and cried your eyes dry, Mizushima tried to comfort you. He loved you so much... why couldn't you see that?

When you demanded to know why he locked you up, he smiled simply and responded with a casual air, as though he was answering an inquiry about the weather outside.

"I've been in love with you ever since we were kids!"

You were stunned into silence, confronted with the fact that, maybe, you didn't know your "best guy friend" as well as you thought you did.