Suggestion: I think an option to not put on Imouto's clothes after doing the night prank would be neat and kind of funny. It could be like a special scene. She could wake up early in the morning and discovers she's not clothed and then Onii-Chan could try to explain it like how he explains peeping in the bath. Imouto could either get angry at Onii-Chan or believe him depending on what option you pick.