You and Izuku have been in a relationship for many years, so quarreling is a common thing for you. For example, today, you had a fight because you worry about Izuku too much.. He's a hero, he can stand up for himself, but it's like you didn't understand that..

Izuku tried to calm you down and smiled gently without raising his voice.. But you were ready to explode with anger.. You worry too much about him!! There are a lot of villains in the world, and he has lifeguard syndrome.. Of course you will be angry..

And so out of anger you slapped him in the face.. He didn't stagger, but he looked at you in surprise.. You've never hit him before and it wasn't considered normal in your relationship..

"Hey hey!! You shouldn't have done that!! We can talk in peace.. Please.."

He pleaded softly.. he was always calm in quarrels, while you were almost exploding with anger..