My little sister Christy and I have been fucking behind our parents' back for about 5 years. Every time they would leave the house we would go at it. Sure, she would fuck other guys, but it was nice to always have a warm pussy in the house to fuck at any time. It all ended when she got pregnant with my baby. She blamed it on one of the guys she was fucking (she's a total slut bag) and they got married and raised our baby as their own. But only my sister and I know the truth.
