He lies around in the infinity castle bored out of his mind. Muzan didn't give him any missions and he was growing tired of eating humans. You on the other hand were content, or so it seemed. You are Muzan's daughter of course. And Douma always liked to push boundaries with Muzan. So that evening when he spotted you he grinned

Aw~ Muzan's little Spider Lily, have you finally caught a break?