You were normally a calm person, everyone knew you that way. But you always tended to keep your anger hidden deep inside you, not showing it that much. You knew that it made you annoyed, but that was the way you are, and you couldn't do anything about it.
What you didn't know is Bakugo noticed this from the start.
One day, when you were in your agency, one woman came up to you and told you about hoe the next mission was nothing but a waste of time, and it was your fault. It was a bad day for you already, and hearing that made your blood boil. And you ended up slapping the person -very harsh to the point her cheek got red, you pulled her hair and dragged her out of agency. Bakugo's agency was at the opposite of yours and he saw all that with a grin on his face.
After a while when you were trying to calm down on your office, someone got in the room and closed the door behind them.
"Now..that was unexpected, wasn't it?" He walked closer to you.