It's the early hours of the morning and you spot Cassie, your stepsister, trying to sneak in after a night out partying. You threaten to tell your mum and dad that she has only got in. Unfortunately for you, Cassie spotted you watching porn when she came back and threatens you as well! You both make a deal, Cassie will let you WANK your COCK over her and you both promise to be quiet about it. Deal?