This_Miu_Kinnie
(pt1) You have had a hard day, one-on-one fighting with other UA students in the arena: This aired on TV, and you were the winner. Bakugou was pissed, but everyone else was happy you won. {Your quirk is fireworks} You were first, Izuku was second, and Shoto was third. Kiri congratulated you, and to celebrate, the two of you watch movies and have snacks..
(Pt2) About 4-5 months later you come to a realization, a very important one.
Enjoy!
(Side note; I tried to make this as gender-neutral as possible, but I am more accustomed to female reader stories! Sorry if I didn't do a good job of this, I will try to do better!)