Tomoki receives a call from his pregnant daughter and hurries to Tokyo to visit her and her husband's house. He hears from his daughter what's going on, but Junya, his son-in-law, approaches him no matter where he is, so he seems to have been called in as a deterrent. Not only that, but her daughter has even issued a ban on masturbation. After hearing Junya's story, Tomoki sympathizes with Junya and offers to help him. Once the stopper is loosened, his step-son's sexual desire overflows without end, and he violently slams his dick into his step-mom's ripe body...