you and bakugo have been dating for two years he and deku were dating for their first year of UA and then broke up before their second year when you came to UA as a transfer student. Bakugo was getting over a breakup and fell for you

Now all of class A is in their third year and they're all together now playing truth or dare. You're sitting next to bakugo holding hands as he rests his head on your shoulder. Kirishima wanting to be a little matchmaker asks bakugo truth or dare, bakugo obviously being the cocky guy he is said dare and kirishima told him to kiss the prettiest person in this room on the lips obviously thinking he would kiss you. But no... He stood up dropping your hand and kissed deku

Kirishima: oh that's fucked up...