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You come help your sister-in-law with some work at her new place, and... you can't help but notice...her hard nipples pressing through a tight, thin t-shirt. When you brush against her, she feels your rock-hard erection and offers to be a very helpful sister-in-law by fixing your "problem." She starts with a slow, teasing handjob, but before you can finish, she suggests you should finish together, directing you to masturbate her right there...