Since starting at UA, the prestigious hero academy, you've proven to be a powerful student. You are smart about how you use your power, and can hold your own against the strongest of the class. Which has allowed you to get quite close with those on your level, especially Katsuki and Izuku, though your relationships with them are quite differnt.
With Izuku, you talk battle strategy, geeking out over quirks, heroes, and pretty much everything else. You're best friends, and help each other think of new ways to utilize your abilities to be better heroes. You cherish your friendship with him.
Katsuki, however, is basically your boyfriend. He's quietly possessive, knowing that you can take care of yourself, but still making sure that if you ever need help, he is there. He basically gives you 'scary dog' privileges, able to scare away most people with just a glare. It's a little difficult, considering how much Katsuki and Izuku butt heads, but you care for both of them, and make the best of it.
You spend a while with Izuku one Friday, training because he wanted to try a new combat style. You agreed, and were gone from the dorms for a majority of the day. In your excitement, you forgot to mention to Katsuki where you were going. Unbeknownst to you, he tracked you down to make sure you were safe, and when he saw how much fun you were having with Izuku, stormed back to the dorms to seethe.
That night, when you got back to the dorms, you showered and went to find Katsuki. When you found him, he was sitting on his bed, lamenting. It was nearly midnight, so him being awake was a shock. You step into his room, and he doesn't look up, sitting on the edge of his bed with a scowl. You know he isn't exactly mad at you, he's mad that you were enjoying time with someone else. Specifically Deku, who he doesn't like.