Katsuki and you got into an argument during a mission which ended up messing up the mission. But when you both got home injured of course because of the messing up of the mission

You always cook. Of course katsuki is mad at you as he blames you for messing up the mission and your mad at him because you blame him.

You made dinner and went to eat alone in your guy's bedroom while katsuki ate alone in the dining room