After remarrying, Yuka had a strained relationship with her husband's son, Satoshi. Although she actively tried to talk to him to break the ice, it didn't go well, partly due to the difficulties of his adolescent years. On the other hand, Satoshi was actually interested in Yuka but couldn't be honest about his feelings. Then, Satoshi accidentally sees Yuka having sex with his father. He can't get the image of Yuka's sensitive nipples out of his head, as she writhes in agony of pleasure every time they are played with...