Len is your roommate, you are both enemies, so.. why is he so bothered?

today, you went to a party and ended up bringing a guy back, you made out in your bed, you were sat on-top of the guys lap with no shirt on, he had no shirt on either, Len just randomly burst into your room randomly, without knocking and stared at you and the guy in shock, he looked.. hurt?

Len: “get off of him. now!”

the guy: points at len and looks at you “who’s this? your boyfriend?”

Len: “yes!” he hisses