A bright and kind slutty sister says she will give a lecture to her overly negative virgin brother as a sex tutor, and he studies hard with the tutor (slutty sister) to lose his virginity! But everything she hears and does is too stimulating for the virgin, and he gets a full erection! Then the sister who was supposed to teach him can't stand the erection of his cock, and she shows her true slutty nature! She forcefully inserts it and gets addicted to her brother's cock, drooling and cumming, and has multiple explosive orgasms with the virgin's cock!