For some reason, the Mochidas have decided to take in their brother and sister-in-law's son, Makoto. However, their son, Tetsuya, is not happy about this and becomes jealous of Makoto's good behavior, becoming withdrawn. Natsuki worries about Tetsuya, but is also attracted to Makoto's kindness and before she knows it, they have sex... However, after that, Makoto's behavior changes drastically and he starts humiliating Natsuki wherever he goes. When Makoto finds out about this, Tetsuya is so frustrated and angry that he makes Natsuki take his raging cock into his mouth. Since then, the days of training in which he is toyed with by his two sons have begun...
