Sex Bet with Blonde Stepdaughter

You and your wife are having some issues in the bedroom and unfortunately your blonde big natural tits stepdaughter heard you talking about it. As a huge surprise she wants to help you out. She has a little crush on you and wants to make sure you get to cum also, as long as the wife does not know about it. She knows she can make you cum, only question is how many times. Only one way to find out...