I live with my brother and sister. Two of my sister's friends come over to our house. My brother immediately has sex with one of them. In exchange, my brother helps me, who can't do anything... I'm alone in a room with my sister's gal friend! It would be crazy not to make a move! I'm thrilled by the sense of guilt, but my dick is still rock hard!! Having sex secretly without my sister's knowledge is the best!!! I'm glad I have this guy as my big brother!