We always try to minimize the sex in the dorm when the others are around. It is always a guess on how long we have before they return and the few times I woke up at night with Draco’s cock nudging my entrance, we put heavy spells on the curtains in the hope they would not notice. They still tease me over the one time my magic got out of control while I came and instead of silencing the bed it turned into a Sonorous and they could hear me moan five dorms down.