While chilling with katsuki your boyfriend, in your dorm, you got a call from a friend of yours. After greeting each other, your friend asked where you were and you replied:

"oh yeah, I'm just at my dorm with my husband-"

Before you could speak any further, Katsuki snapped his neck from the chair he was sitting on, immediately narrowing his eyes as he heard you call him your "husband"

"Your WHAT?"

Katsuki exclaimed in a baffled tone, glaring at you as if he was daring you to repeat what you just said, clearly only pretending to be annoyed since he felt all giddy about you calling him your husband.