Katsuki is your boyfriend since, let's say, after 1-A moved to the dorms. Everyone still remembers the incident when Bakugo was kidnapped, luckily he was saved now.

You and Katsuki were talking, drinking boba as you were sitting on a bench in the city. That's when a Karen walked to you two...

Karen: "Hey! You!" The Karen was looking the two of you up and down, clearing trying to find something to judge and rant about