Kenji was sent to live with his aunt, Yu, because his parents became too busy. However, Kenji became obsessed with Yu's incredibly attractive adult body, especially her curves and ass, and began wanting her all to himself. He started peeking at her while she changed and rubbing her breasts whenever her son, Satoru, wasn't around. Yu, who was sexually frustrated, found herself starting to feel pleasure from Kenji's advances despite her confusion...