Thread by @art_in_distress

#bkdk time Quirk shenanigans where future Katsuki gets sent back in time to their days at UA. The baku and deku of that time still haven’t acknowledged their feelings for each other, but Adult Katsuki knows that he had a crush on Deku at that time.

So of course he has some fun

In his time, he and Deku are engaged, and they know each other intimately. Katsuki knows everything about his Deku, and he decides that this would be the perfect time to make his cute nerd feel appreciated. He always did regret how he treated Deku, too stubborn and-

-prideful to admit his feelings. Deku deserved better, and hey, maybe the younger him would grow the balls to make a move.

So, Katsuki treated younger Deku how he treated his Deku, within reason of course. He made sure to make Deku’s favorite food, drinking in-

-the adorable blush that rose across his surprised face. He made sure to completely ignore the younger version of himself and instead focused completely on Deku, nodding and humming along as the nerd rambled and muttered to himself.

He paid attention to Deku, made sure he was really listening, which he could tell the shy nerd appreciated, if the constant redness of his face and the way he’d duck his head in embarrassment was anything to go by.

He also complimented him a lot, like he would with his own-

-Deku, making sure to not hold back. Well, he tried to keep it a bit more PG, wouldn’t want to scare the nerd off before they even got together. Instead, he’d say sweet things, like:

“You did a good job today, nerd.”

“Your hair looks good, it frames your face nicely.”

“Take care of yourself, okay nerd?”

“Sit, I made your favorite. Eat so you don’t die.”

“Go to sleep, you need rest. Damn idiot, making me worry.”

“Are you okay? Want to talk about it?”

“I’m proud of you, Izuku, you’ve improved a lot.”

He would pet the top of his head affectionately and put a blanket around his shoulders when he was shivering but too wrapped up in his journals to notice.

“You really should take better care of yourself, dummy, I can’t lose you y’know,” he’d chastise as he tucked the-

-blanket around him.

He got especially bold one day, while he was bandaging the nerd up after an intense sparring match, and kissed his bandaged knuckles. He immediately got a nose bleed and fell over, hitting his head on the ground as he passed out.

He yelled at him for that.

He’d give Deku tips on how he’d improved his style while also making him take breaks when he knew his joints were getting sore. “And you call me an old man, shitty nerd.”

He loved to pamper his Deku, making him all his meals and drinking in the-

-excited look he’d get on his face when he’d spot the older male. It was quickly becoming his favorite thing ever.

His second favorite thing was seeing how much it pissed off the past version of himself. Anytime Deku made his way over to the adult (he still did that cute-

-little bunny hop of his, it was too adorable) and start rambling about his newest notes, he’d look over the nerd’s head of hair to find the younger version of himself glaring daggers at him. He’d grin wide as he unabashedly pet the top of Deku’s head, making the-

-greenette giggle happily while young Baku’s face just reddened with pure rage. It was absolutely hilarious. He’d stare at his younger self, daring him with his eyes to finally make a fucking move already, but his younger counterpart just shook with anger before storming off.

It was just too fucking easy. He also may or may not have felt a sense of pride when, between the two Katsuki’s, this version of Deku turned to the adult.

‘See what happens when you’re nice to him?’ he’d say with his eyes to his younger self, a satisfied grin on his face.

‘Die, bastard!’ his younger self would glare back, making Katsuki chuckle to himself.

‘Grow a pair and do something about it, bitch’ he’d say with a narrowing of his eyes before petting Deku’s head again. His hair was just as soft as in his time. He’d cut a lot of it off as-

-an adult, so Katsuki was going to make sure to enjoy this version as much as he could. He played with it, combed it with his fingers, and even went so far as to braid it (Mina taught him, okay?) because he knew how much it calmed him down.

It was cute to see the nerd unconsciously seek him out when he was feeling stressed, and he’d gladly indulge him. Take notes, younger him. He’d stroke the others hair and let him either ramble about what was bothering him, or just sit in companionable silence.

Meanwhile, younger him would be lurking nearby, frothing at the mouth in anger and jealousy because he was too emotionally constipated and embarrassed to do anything. It was hysterical. He’d look over his shoulder and lock eyes with the gremlin as he kept in his laughter.

“Kacchan’s so cool now!” he’d praise with that sweet smile of his, and he’d pinch his cheeks in amusement.

“You saying I’m not cool now, eh!?” younger him would shout, breaking whatever he was holding in his hand.

“Eh!? N-no! You are, but-I”

“Oi, brat,” he’d interrupt-

-making him and all the other students nearby pause, “don’t be so defensive all the time. He didn’t mean anything by it, fucking relax.”

“Don’t tell me what to do, old man!” his younger self shouted, making the older man roll his eyes. Jeez, he was such a pest. He turned-

-to Deku and gave him a gentle smile as he placed a hand on his shoulder.

“Thanks for putting up with me like this, Deku,” he’d smile, making the greenette turn red with embarrassment as his younger self turned red with anger.

“O-oh! N-no problem! I mean, it isn’t anything, r-really!” he stammered as Katsuki chuckled, leaning down to press a kiss to the top of his head. That made everyone react, and in his younger self’s case, react violently. Katsuki paid him no mind as he led Deku to his room to-

-get away from everyone. He may be more mellow now, but the others were still damn extras, especially at that age, so annoying.

“Kacchan?” Deku asked one day while they were alone. “Why did you hate me at this age? Why are you so nice to me now? Do I die in the future?”

Katsuki hated that their relationship was so bad that the only way Deku thought he’d possibly care about him was if he’d died. Katsuki sighed, scooted closer to the shorter male, and pulled him into a tight hug. The other froze up, but didn’t object as he returned the embrace.

“I don’t hate you, Deku even at this age,” he said softly. “I know that might be hard to believe, but I was just a coward, and an ass. I didn’t treat you the way you deserved, for a long time now, and I want to make up for it. I want to treasure you like I should have been doing-

-all along. I’m sorry that things are the way they are now, but you’re really important to me, okay? Don’t ever forget it.” Deku sniffled as he tightened his grip on the blond, burying his face into his shoulder as he tried to keep his tears under control.

“Heh, let it out nerd,” he chuckled as he gently pet his back and his hair. “It’s alright, I’m right here.”

“R-right,” he hiccuped, nodding into his shoulder. They stayed like that for a little while before the younger male pulled away, taking a few relaxing breaths.

“So, I’m not dead in the future?” he asked tentatively, looking up at him with wet eyes. Katsuki laughed and shook his head.

“We’ve had some close calls, I’ll never forgive you for that by the way, but no, you’re still kicking, and as cute as ever,” he added with a wink, making-

-Deku jump and bury his face in his hands.

“Kacchaaaaan! Stop!” he whined as Katsuki laughed.

“C‘mon, you like it,” he teased, grabbing the nerd’s cheek and pulling on it.

“Ow! K-Kacchan!” he sniffled with a smile. “That hurts! No!”

“Yeah? What’re you gonna do about it?” he-

-taunted. Before they could say another word, the door flew open, and his younger self had burst in with sparking palms and an angry expression.

“Get the fuck off- him?” he tapered off, his stance relaxing as a look of confusion crossed his features. They all stared at-

-one another before everything clicked in his head. Did his younger self really think so little of him? Well, he had been kind of a shit, and with Deku he tended to overthink things, hmm. He merely laughed and got up off the bed, shoving his hands in his pockets as he-

-brushed past his younger self, who still eyed him suspiciously as he made his way to the door.

“You two have a lot of things to talk about, I think,” he smiled at them as he crossed the threshold. “So, I’ll leave you too alone. Oi, brat,” he called to himself.

“What?” his younger self grit out, hands clenched into fists.

“Your pride isn’t as important as you think it is,” he said, clearly surprising the other blond. “You’ll be a lot happier that way, and you’ll be the type of person worthy of him. Don’t fuck it up even more.”

And with that, he closed the door behind them, sighing as he walked aimlessly through the halls he remembered so well.

He blinked, and he was back home. He heard a crash.

“K-Kacchan!” Deku cried out before he was tackled to the ground. “Kacchan! You’re back! I missed you-

-so so much!” he sobbed as he pressed kisses all over his face. Katsuki merely wrapped his arms around his fiancé and held him close, burying his face in his soft, curly hair as he rocked them back and forth, reassuring his lover that he was back.

“I missed you so much, Kacchan,” Deku hiccuped, hiding his face in his neck. “I was so worried, I didn’t know you were, if you were, e-ever-“ he choked off as the blond gently shushed him.

“Ain’t no stupid Quirk gonna keep me away from you, Deku,” he assured him, almost afraid-

-of loosening his grip, even a little. “I’ll always find my way back to you, okay? I love you, dummy. And nothing’s gonna stop me.” That earned him a wet laugh from his fiancé, who sat up and smiled at him with tears in his eyes.

“I love you, Kacchan,” he hiccuped as Katsuki wiped away his tears. The two sat in silence for a little while, content that they were back together again, before Deku spoke up.

“So, Kacchan? Where exactly did you go?”

END

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