If you asked, Bakugou Katsuki would tell you without hesitation that he is a certified genius. There is very little that he doesn't know and it's something he genuinely enjoys boasting about.

Despite the vastness of his knowledge, Bakugou Katsuki is also an entire dumbass.

Bakugou can and will gladly recite for you all that he knows about the second law of thermodynamics, but has exactly zero fucking idea why Kirishima Eijiro sits so close to him on the couch at night or why it makes his stomach feel like it's filled with butterflies when he does.

If you asked, Kirishima Eijiro would be the first one to tell you that he's kind of sort of a dummy but that he used to be a lot smarter in middle school.

Mostly because in middle school, there was no Bakugou Katsuki to keep him hopelessly distracted.

And yeah, Kirishima might not be great at math but he's the first one to realize that him plus Bakugou equals something much greater than friendship.

Bakugou on the other hand does NOT realize that, not until he sees it written in plain text in Kirishima's notebook by accident when he glances over at him in class.

It's just on the side margin, a simple little doodle of a stick figure clearly meant to be him based on the hair and telltale scowl, holding hands with Kirishima surrounded by teeny little hearts. On the bottom, a simple but ground breaking equation:

Katsuki + Eijiro = ♡

"Ah, I fucking get it finally," Bakugou huffs out loud smacking his hand on the desk, more annoyed with himself than anything.

Kirishima who was honestly dozing off is startled awake when Katsuki suddenly stands, gripping him by the shirt in the middle of class.

"Oi, so we like each other then?"

Kirishima blushes like crazy at the question, trying to understand what the hell is going on but when Bakugou tilts his head to the open notebook with his embarrassing scribbles he's too mortified to do anything but nod.

At this point everyone in class is staring slack jawed but Bakugou pays no one any attention, not even Aizawa who sighs from the front of the room, his narrowed eyes burning into Kirishima's like he's trying to piece together a puzzle.

Finally after what feels like a thousand heartbeats, Bakugou's face splits into a huge grin.

"Fuck," he says, chuckling softly as his eyes turn soft. " And I thought I was supposed to be the smart one. Sorry it took me so long to understand."

There's no time to react when Bakugou tugs him forward and presses their lips together, rendering his last hard working braincells completely stupid while around them the class erupts into gasps, shrieks and an overly rambunctious catcall from Denki.

Bakugou's lips on his are warm and soft and gone far more quickly than he'd like, but Aizawa is annoyingly fast at separating the two.

The detention they receive is totally worth it though.

And Bakugou might have been slow on the uptake, but he's impossibly quick at figuring out different formulas in which him and Kirishima fit together best.

What would you expect? He's a certified genius after all.