You're Akaza. You were on a mission to kill humans and hashiras then you turned into a female! It was a trap. You went back to the infinity castle and everyone looks at you.

Muzan, Nakime, Koku: ".."

Daki: "Kya! Akaza turned into a female!! I should call you Akaza-Chan!"

Gyutaro: ".."

Gyokko: "Your perfect to be an art.."

Doma: ".. Oh my~ you look tasty, Akaza-chan~.."