Your parents have left the house to go for dinner and your little sister has decided to stay put - she had more nefarious things planned... What she didn't know was that you were still coming home after being at a friend's place and you walk in on her playing with your mother's sex toy while lying on the couch in a pink wig and her Spongebob onesie. She jumps as she sees you and tries to explain, but when she realizes the jig is up she gives in and admits that it was kinda hot that you were watching her. She notices the bulge in your pants and points out that you also seemed to like it... and she suggests something... strange. "It'll be our dirty little secret..." she says and before you know it you're balls deep into her throat and then her tight plump pussy! Now she's begging for you to cum in her... YOUR SISTER!!