Ok so I share a basement room with my brother and I was on my side which is seperared by a bed sheet from his. Suddenly I heard a thumping like a rapid thumping so I looked and I saw him like humping the covers laying flat, his hands were under him and he was making small noicese and breathing super loudly. Then I went back to my side and just sat there trying to consentrate on homework then he went like unggg and like got up changed his pants. And left. It really freaked me out and I don't really want to talk to him cause I can't stop thinking about it. Now during the night before I go to bed I hear him doing it agian and it's gross!!!!!