I love my wife. She is hot and has a sexy ass. We fuck often and she goes down on me all the time. There is really nothing to complain about my sex life. But there was something missing. nnIt was my sister-in-law. She was this hot, crazy kid who was 18 when I married my wife. God she was ripe. I loved vacationing with wife's family because we would all stay in the same cabin. Those nights I would thrust deeply into my wife's yielding body as I imagined fucking her 18 year old sister just a few doors away. nnA few months later, one evening I came back home from work and my wife was already there, along with her mom and sister. They were all crying and holding each other. Rachel took me to our bedroom and said her grandfather wasn't well and needed surgery. nnRachel, my wife, and her mom both took leave from work and had booked their flights. Terry, my sister in law, couldn't go since she had exams and submissions. Rachel asked me if I would be ok baby-sitting her sister. I shrugged, trying to play it cool. "Am OK, if she is OK with it."nn"We spoke to Terry and she's OK. She said she would rather stay here with you than be all alone at my mom's house.