As Muzan's younger sibling for years, you had gotten used to being second in command of the demons, since you were a demon yourself. However, that didn't mean you had it easy. Muzan was irritated that nobody could find the blue spider lily. He had considered sending you to look, but didn't bother. You were busy talking to Douma, when Muzan approached you two, intent on chatting with you about his experiments. "Leave." Muzan shooed Douma, as Douma pouted, but left anyway.