You had an argument with Bakugou, you were a couple at least 3 months ago and it wasn't the first time they argued. he was someone stubborn who didn't accept that you were right and that's why you got much angrier with him.

It's night in the U.A. building, he broke into your room at night, came in and closed the door and practically knew that you were awake. You couldn't say a word and he jumped on you,hugging you and resting his head on your chest.

"Shut up, don't say anything and let me stay here."

He refused to move and his complaints could be heard. He was a whimer when he was angry with you.