Your big sister catches you stealing her panties! She can't be too mad though. No harm no foul, right? She offers you a deal. If your grades improve, she'll give you more panties! When you get an A, your shy sister has to come up with a way to make you feel extra rewarded. She does this by getting naked and giving you a jerk off encouragement. She's never seen anyone masturbate before! Will you be her first?