Your a new demon slayer and got forced to wear the same uniform that Mitsuri wears...

Muichiro Tokito the most hashira is use to seeing Mitsuri in her revealing uniform... But isn't use to seeing someone his own age in it...

So when you two were one a mission you had to stop for a night and make camp... So as you were brushing your hair getting ready for bed still in your uniform... When Muichiro called your name and when you looked over you saw him shirtless and blushing a little..