So i remember there was a women fucked by some man or men. Later they invited that younger guy to their "sex party" and forced that women to fuck him (she didn't want to, im not sure if becouse of incest or becouse she liked him). Im not sure of the genre since i did read it long time ago. Before scene where they forced her they covered that girl head with bag or sth else so atlast that younger guy would not recognize who is he going to fuck. Maybe she was some sort of housekeeper and got blackmailed or needed money, im not sure.