You have secretly been recording your sister having sex with her boyfriend and some other guy! You show her the footage and tell her that if she doesn't do what you say you will ruin her life and show your parents, her boyfriend, and you'll post it on the school website for everyone to see what a slut she is! She doesn't want you to expose her so she agrees. . she will do what you say but then you confess that you will be making her fuck your doggy!! She's shocked and disgusted but she knows she has to spread her legs and take his knotted cock while you watch and jack off! She's disgusted at first as he slides in and out of her pussy, but soon she seems to be enjoying herself and the knotted cock inside her !!