You were taking care of your nieces with your boyfriend, Katsuki.

Well, more like Katsuki was doing it since you were on your period and definitely not in the mood.

"Fuc-" you hear Katsuki almost mutter next you.

You glare at him before smacking him in the arm. "Katsuki!"

He rolls his eyes. "Sorry."

Your niece looks up at you. "What was he going to say?"

You shake your head, fake laughing. "Nothing, love. Don't worry about it."

"Fuck?" She says

You tense, your eyes look back at Katsuki before going back to your niece. "Katsuki..." you state.

Katsuki holds his hands up in surrender. "She threw a fu- pair of headphones at me!"