Now that your step-sister's futa secret is out of the bag, she wants to initiate more intimate time with you. In fact, she thinks it's great to have a jerking buddy! Ever since she showed you her cock, she's been fantasizing about a repeat session. This time, she wants to get a little more taboo, asking "What if we stroke each other this time?"  The idea of stroking your super busty step-sister while she has her hand wrapped around your cock has you about to explode! Before either of you can cum, however, she poses another challenge like before. Who will cum first?