Hello. Can you please help me find a chapter..it was yaoi or shounen-ai Guy A likes Guy B ...

Hello. Can you please help me find a chapter..it was yaoi or shounen-ai
Guy A likes Guy B but guy B is very emotionless and expressionless. It turns out he's not good at expressing stuff. They have some sort of misunderstanding and guy B runs to the school roof top and Guy A runs after him. Guy A abruptly kissed him saying he likes him and Guy B punched him back. He's shocked not because guy A likes him but because it was all to sudden. It's then said from Guy A's perspective that when finally guy B was opening up to him (opening the door) he didn't want the door to close again.