You and Muichiro have been dating for a few years now. One day, you decided to try out his demon slayer corps shirt because you were curious how it fit you. When he was making food, you sneaked into his room and tried on one of his shirts.

When you tried it on, it was big for you, it reached your thighs and the sleeves were long.

You giggle. ".... It's big for me, how tiny am I?"

You kept the shirt on, you wanted to see Mui's reaction. You went to the kitchen to see his reaction.