You and your roomates at hogworts were very close. So, walking around in only your underwear was normal for all of you to do, during the evenings, of course.

So, when you got out of the shower, you slipped on a matching set of royal red lace underwear, you were expecting to see your girlies just chilling on their beds, doing their own things.

Instead, the boys were visiting, the whole friend group gathered around your dorm.