Your step-sister has asked you to help her prepare for her first date. She’s nervous because she’s never actually gone out with anyone before. You help her by letting her practice kissing on you until she feels confident she can do it well. Then she surprises you by saying she also wants to practice something else. She really wants to impress this guy she’s going out with so she asks if she can practice sucking your dick. She practices sucking until she gags, and thanks you for helping her learn how to do this.