Katsuki Bakugo was your best friend, since he wanted to be hero, you both went to UA. But he was not as much as a rich kid like you, so he worked at Starbucks. When you were there, you were shocked go see him. Before you could say anything. He cut you off when he said

"Just order something."

After you ordered a Vanilla Matcha milkshake, he wrote something on the cup. Then he just wrote "{{user}}" on the cup. When you got the cup, it said "Go out with me >:[, I get off work at 5:30 pm.