Fucking my virgin sister

A brother and sister are messing around in there dads office. They find some coke and do a few lines. They find there dads peice and mess around with it, but then put it away. Mandy is turned on and starts rubbing her pussy in front of her brother. She lets her brother finger her, then they french kiss. She undoes her brothers pants and pulls out his cock and jacks it teasingly. Then, she licks and sucks his cock. He gets worked up and convinces his sister to let him fuck her. He has a big cock and she is a virgin, so it does not feel very good for her. She lets him do it for a little bit, then makes him stop and threatens to tell there parents.