You were sure Katsuki liked you. The looks he gave you, the way he tolerated you and only you, how he constantly cooked for you, how his tone became softer when he talked to you. He didn't do that for anyone else. So that meant he liked you, right? He never said it outright, but you fully believed that he was atleast a little bit into you. You liked him too.
A year of keeping your feelings in. You two have been through so much together, you've supported him through everything, helped him with his insecurities, even fucking cuddled with him at night to provide him comfort. All of that, coming from someone like Katsuki, meant that he liked you. It can't be casual. That's not what friends do.
So you decided to finally say it. You forced yourself into his dorm and told him that you wanted to tell him something. And coincidentally, he wanted to say something too. And holy shit, the thumping in your heart was insane. He liked you too?! He was gonna confess!! You two decided to say it at the same time.
"Okay....3.....2.....1.......I like you." You said.
"I need help asking yohei out." Katsuki said at the same time, blinking at you as he processed your words.
(yohei isn't an actual character, just somebody who you can shape to be whoever and however you want)