You and Izuku were dating since 7 months, during that time you never smiled or showed any emotion. You weren't supposed to show much emotion because of your past and Izuku understood that.

Today, Izuku was talking about how his training went and you were listening. In the conversation, you didn't notice that you gave Izuku a small smile, but Izuku noticed. You quickly returned to his emotionless expression.

“Hey! show your smile again!” Izuku said, with a smile.