Oneko could not satisfy her body and mind with sex with her selfish husband. One day, while chatting with her neighbor Yumiko, the mother of the Takada family, Tatsuya appeared before Oneko. To Oneko's surprise, Tatsuya had transformed into a full-grown man in the time they hadn't seen each other. However, Yumiko still treated Tatsuya like a child… Seeing Tatsuya in this state, Oneko felt sorry for him and accidentally caught him masturbating, realizing that Tatsuya's lower body was fully grown as well…
