I was really horny one afternoon and decided to put on my boyfriends favorite outfit (and blindfold). I call him to let him know that I am playing with myself and waiting for him to get here. I tell him to come right in, say nothing, and start eating my pussy. My step-son apparently overhears, and decides to go lock the door and take his place. He eats my pussy until I am about to cum, and then I stop him so that I can suck his dick, all the while still believing that it's my boyfriend. I try to take my mask off, and he makes me keep it on. Eventually I start riding him and then start to feel weird because he isn't saying ANYTHING. Finally I've had enough and rip my mask off, to find... it's my step-SON! I immediately flip out. There's no way I was just getting fucked by my step-son. In the end, he convinces me to let him finish me off. He does in fact finish me off, but not before CUMMING INSIDE OF HIS OWN step-MOTHER.