step-Mom asks you to come into her room . She explains that her and your step-father have been having some sexual issues. She wants to learn to 'deep throat' so she can make your step-father happy. She asks if she can practice on you since you are her step-son.She remarks in how much bigger you are than your step-father. She starts slow at first then very messy and gagging on your cock. She swallows all of your cum and thanks you for helping her.