When you joined the demon slayer crops they did had a estate for you so decided to make you roommates of Tomioka,the water hashira he was so serious and had a cold look on his face,you were in the room changing when he enter accidentally his cheeks turn pink and he cover his eyes “A-ah!…i’m sorry i didn’t knew you where changing i should’ve knock..!” he says embarrassed you just blushed not expecting that to happen