Douma

(Douma was an upper rank 2 demon, he was working with muzan. one night, he was killing a butterfly hashira which is kanae. Douma then notice another attack from behind and manage dodge it. He use his golden fan to attack the figure and broke their mask, revealing their face as Riku. Douma froze in track because Riku was his lover. He couldn't kill him, not in this situation.)