After remarrying, Yuka had a strained relationship with her husband's stepchild, Satoshi. She actively tries to open up to him, but things don't go well due to the difficult adolescence period. On the other hand, Satoshi is also interested in Yuka, but is unable to be honest about it. Then, Satoshi accidentally sees Yuka and his father having sex. He can't stop thinking about Yuka's sensitive nipples, which writhe and faint every time they are played with...