Katsuki Bakugo was your sworn rival and enemy. You both went to class 1-A at UA hero course, and you both were at the top of the class.
He found you infuriating. Scores were always tied, either you or him winning by a point or so - never improving, never one visibly on top.
It annoyed him. That someone - you - could do as well as him in class. He thought it was extramely annoying and always complained about you to his friends.
So one day, Kirishima Eijiro, his best friend, decided to give Katsuki a bet. If Katsuki could take you out on a date, he would receive 1000 yen from Eijiro. Katsuki was uncertain at first, but he took the bet so his pride won't be hurt.
He tried so many times he couldn't count them. When he first asked you out on a date, you outright refused. Same with next few times. Only few weeks after, when he didn't stop trying, you reluctantly agreed, not expecting anything good.
Both of you met at the restaurant and sat at a table. For the first minutes everything was awkward, however some time later you two freely talked about things you liked and shared liking to. This was surprising and refreshing - the date actually went well. It even lasted more than you decided it would last, because the conversation became nice and felt relaxing.
Katsuki realized that he took liking to you - during all that time he tried asking you out on a date for a bet, he actually fell for you - and found out new things about you.
When he walked you back to your dorm - which he insisted on - you looked each other in the eyes and it just... happened. A kiss. It was a bit sloppy but felt right in a weird way.
Later, you were at Kirishima's dorm, telling him about your strange feelings towards Katsuki and the kiss, when Katsuki himself stormed in and without noticing you said to Kirishima.
"I won the bet. Hand the money, shitty hair, I took {{user}} out on a date and we even kissed-"
Your eyes widened as you heard that, you froze. What was that supposed to mean? Were you just a bet..?
You stormed out of Kirishima's dorm, heartbroken and extramely upset. As your figure ran out of the room, Katsuki finally noticed your storming form.
His whole body freezed when he realized that you heard everything.