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Izuku wasn’t a jealous person. Not at all.
But seeing your boyfriend all over your best friend while you’re also very much enveloped with his best friend was just…
He couldn’t break free of Kirishima’s hold because damn the boy was tough and he didn’t want to accidentally hurt him by activating his quirk. And Katsuki was, well…
So there was this girl, whom Izuku saw as a near villain because she was making them do things without consent at the end but he’ll get there, and this girl asked for Todoroki and Kirishima’s signs. As well as Katsuki’s. Now there’s no surprise in that because they had a fame with sports festival and being in UA Hero Course class 1/A was more than enough nowadays and the students were used to it by now. Though apparently, she had very lovely (!) quirk that allowed her to make people that wrote, or signed or whatever, in her notebook to hug and… and… and kiss!
The point is, no one knew Izuku and Katsuki dating yet. It was something very knew and they wanted to try it first and then announce people when they feel like it because, quoted, “their personal lives were none of anyone’s fucking business”. Meaning: Izuku couldn’t directly just yell at the girl and possibly Todoroki to get the hell away from his boyfriend.
Now, he could turn a blind eye about the hug since he was also hugging Kirishima but when the girl tried to make them… kiss, Kirishima somehow broke free from the quirk’s effect by shouting out a very clear “I DON’T WANT TO KISS A MAN!” which was predictable since he had a secret crush on Ashido that everyone can actually see. So, Izuku expected a similar outburst of loyalty from Katsuki, rightfully so, which didn’t come.
And, no, Izuku was no jealous man. But Katsuki’s lips were his and his alone, discreet or not.
So there were mainly two reasons why he Smashed his lover’s ass to the next wall:
Gotta break the contact.
Revenge for letting someone else kissing him.
So the plan worked, they didn’t end up kissing, Todoroki and Katsuki, good for Izuku. There was one more problem though.
Izuku wasn’t talking to Katsuki, he didn’t talk at all with anyone the whole evening. He just went to his room saying he was tired from that day’s hero class and locked the door behind him before Katsuki found the chance to follow pursuit.
“Come on, Deku, you’re being ridiculous! It was the fucking quirk!”
No answer.
“Deku, open the damn door and let me fucking explain at least! Don’t make me shout in the middle of the corridor or someone will hear!”
“You can just leave instead, Katsuki.”
Fucking… Katsuki?! Ok, he was screwed for good.
“Deku can you please open the door, love. I swear I won’t get near you if you don’t want to. Come on.”
“Why, you worry about people finding out that you’re dating me? Maybe you can go kiss whoever makes fun of that, hah?”
Izuku was pouting on his bed, arms crossed and eyes damp. He was angry, not jealous.
“Do you even fucking hear yourself? Why would I be worried over that?!”
No answer again. Katsuki huffed, annoyed.
“Look, I’m sorry. Just… let me in and let’s talk, ok? Please, Izuku.”
Katsuki waited for a while longer but no door was opened.
“God, Deku, you’re stubborn as a damn goat when you’re jealous.”
Now, that, got the reaction Katsuki intended. Because since the days they were just flirting, Izuku always took pride of how he wasn’t the jealous type and he wouldn’t ever be an overwhelming partner. Katsuki wasn’t overwhelmed by this little tantrum Izuku was pulling by any means, in fact it was super cute and he’d give up on his kitchen rights for a month to just see the pout on Izuku’s face right now.
That is if he fucking opened the goddamn door.
“I AM NOT JEALOUS!”
“Don’t shout, dumbass, someone will hea-“
Before he could finish his sentence he heard the elevator’s ding. It was about two seconds before whoever extra walked in on Katsuki in front of Izuku’s door and the stupid fuck shouting out some nonsense shit.
“Deku you gotta let me in right about NOW come on!”
Katsuki could hear Dunce Face and Grape for Brains laughing loudly and talking to each other.
“- mean, did you see his face? I’ve never seen Midoriya this intimidating and Kacchan was just, pfft, he shat himself!”
“Tell me about it! He tried to hide it but not from us. Come on, I’ll show you the new magazine I’ve got my hands on. It’s Mt Lady exclu-“
He didn’t catch the rest of it since he was pulled inside the room in less than a few milliseconds and the door was closed shut. Again before he could register, and for the record Katsuki’s reflexes were the best among the whole class but obviously couldn’t race Izuku’s jealous boyfriend mode, he was tied to Izuku’s chair. His hands were enveloped with Blackwhip to stop him from using his quirk, smart move. His hands were behind the chair and his ankles were tied to each front foot, chest and legs tightly secured as well.
“Ok, kinky, but definitely not necessary.”
“Shut up before I also gag you.”
“Don’t tell me what to do.”
“Why not? You don’t listen anyway.”
“Izuku, come on. You know it too fucking well that I didn’t do it on purpose-”
“Yes, and you didn’t also try to stop it like Kirishima who was actually loyal to his love-”
“And we didn’t even fucking kiss in the end-“
“Because I smashed you away before you could bloody do so!”
“Then what’s the point of fighting over a kiss that didn’t even happen?!”
No answer.
“I’ll sleep so stay here until the coast is clear or whatever and then do whatever you want.”
“Oh no you’re not. Hey. Hey! Deku I know you’re not asleep yet, it’s literally been three seconds.”
Izuku pressed the pillow to his ear and turned his back to the chair.
Katsuki sighed and tried the bonds. There was no point in breaking the chair because the fucker was holding him down better with the Blackwhip. He could just talk Izuku’s ears off until he gave up and released him, or he would just shoot him out of the room entirely because he couldn’t predict anything about this Izuku. He’s never seen this side of him before.
Sure, he would hold Katsuki’s hand tighter whenever someone talked to him outside of school when no one’s watching but it was a cute gesture, not a whole ass attitude.
Katsuki had to play it dirty. He fake hissed.
“Ow, my arm… Should’ve been careful with the stretch…”
He was totally fine, maybe a bit sore from where Izuku kicked him earlier but it was barely a throb.
Though, Izuku didn’t know that. And if there was one thing Izuku couldn’t possibly ignore, it was to see Katsuki hurt.
Soft ass.
And, it worked.
Izuku slowly turned his back with slight worry on his face and steadily retracted Blackwhip. He didn’t say anything or asked if he was ok but before he could do so Katsuki jumped at the bed and enveloped him with an iron gripped hug.
“Gotcha!”
“Let me goooo! I’m mad at you Kacchaan! You liar, you knew I couldn’t stand seeing you hurt! Cheater!”
“I said I’m sorry, nerd! And sorry for pretending too if you want but I ain’t letting go until you say you forgive me.”
“Hmph.”
“Come on, ‘zuku! I’ll even take you on a date to the new All Might café!”
“Good try. It’s your nerd ass that wants to see there and, no, because you’re taking me there regardless.”
“You spoiled brat.”
Katsuki let go a little bit to look at Izuku who was facing away from him. The ash-blond held his chin and met his forest green orb all gloomy. Izuku wasn’t lying when he said he was upset.
“Damn, baby, I didn’t think it would make you this mad. I’m really sorry.”
“Of course I’d get mad, you’re my boyfriend Kacchan. It’s already hard enough to roll my mind around the fact that…”
“What? What fact?”
Izuku tried to avert his eyes but Katsuki didn’t let him, holding his chin in place.
“Tell me, don’t avoid the question.”
“The fact that… you chose to… be with… me.”
Izuku was trying to swallow around the lump on his throat and hold back his tears. He was already nervous about the fact that they were dating discreetly but also… Izuku wasn’t blind. He, and probably any person you turned from the street, could see that Todoroki was attractive. Izuku was just… plain. That’s how everyone described him as at first sight. He had those baby fat glued to his face and the freckles also made him look like a five year old. He was short and just so… average. Also, Katsuki hated him not so much time before they started dating.
What Izuku felt seeing those two’s faces getting together wasn’t betrayal but panic. He feared if they kissed and Katsuki realized he made a wrong choice by dating Izuku while Shouto was just there-
“I’ll have to stop you right there, dumbass. Thank god you have a stupid mumbling habit or I’d never get that nonsense outta your damn mouth. I can’t believe how you can be so idiot sometimes Deku.”
Izuku was sobbing and sniffing by the time he realized what he said out loud. Now it was all out in the open for Katsuki to see, he presented Todoroki in a golden plate to his boyfriend. Katsuki was going to dump him.
“I don’t know how many times it will take for me to make you understand that I’m sorry I treated you like shit back when we were kids. I don’t know at which confess you will believe me when I say ‘I love you’ over and over and over again but I don’t fucking care. You don’t get choose who I want to date or who I want to find attractive. You don’t get to tell my boyfriend all those stupid degrading shit either because I chose to love you with all that you are.”
“Kacchan…”
“Today was… I don’t know how the fuck did Shitty Hair broke free but I swear I tried, too. It could be because he signed the damned notebook and you didn’t so that the effects were less strong in your case but Icy Hot and I both were under so it didn’t give in. I panicked too, of course I panicked because all that shit was about to happen in front of you and… the way I treated you back then… I thought you’d have enough of it and leave me… I don’t care if Todoroki is the best model of Japan but when compared to you… Izuku I’ll always choose you. There was never anyone else but you and that’s not changing.”
Katsuki thumbed away the tears that were running along Izuku’s round cheeks freely and kissed each of them on the freckles.
“I find your cheeks and freckles adorable and they’re extra precious now. You know why?”
Izuku’s cheeks were tinted pink now and he sniffed once before he spoke with a wobbly voice.
“W-Why?”
“Because they’re fucking mine. Because you’re mine but I am yours just as much, don’t you ever forget it. Ok?”
“Y-you big sap.”
“Hell yeah I am, I will be the cheesiest person in the world if I want for my boyfriend. Got a problem with that?”
Izuku chuckled and hugged Katsuki, arms around his neck and face buried in the crook of his neck. His voice was still watery and now muffled, trying to press down his giggles.
“No, not a bit, Kacchan.”
He got back from his hiding spot and Katsuki looked into his jades once more to see if he cleared out any painful sadness that’s left inside. He saw none, thankfully, instead he saw a deep fondness.
Izuku leaned in slowly, looking between Katsuki’s eyes and his lips. Katsuki took the cue and leaned in on his side faster than the greenette, closing any distance left to seal this little misunderstanding away.
They kissed their frustration and silliness out before they parted, with red cheeks and even redder lips. Izuku looked meaningfully into his crimsons, then his whole feature got serious and he looked like a kicked bunny.
“But seriously, if I ever see you kiss another, Kacchan… Let’s say you won’t be off the hook this easy with a few cheeky words. And no hugs with anyone for a month, Kirishima included. I can’t take it.”
It was Katsuki’s turn to giggle that turned into a whole hearted laugh.
“Oh my fuckin’ god! You’re adorable! Pffthahaha!”
“Kacchan take me serious! I mean it!”
“Whatever you say, nerd. Damn, hahaha!”
Katsuki pinched Izuku’s cheeks until they were sore and Izuku settled with being the big spoon as a punishment for Katsuki as they cuddled until they fell asleep with smiles plastered on their faces.