"Well, Cindy is my sister, and Mary has been her best friend since they were like four years old." I began, my cock beginning to stir as I massaged her tits. My other hand started to stray from just squeezing her ass cheek to wandering her crack, which she seemed to like, adjusting so I could reach her derriere better. "She had decided years ago that she'd lose her virginity to me and take my virginity at the same time, and well, she didn't make a move on that until well after I'd had a girlfriend and made that leap. She refused to believe it and still insisted we'd get...