Shinichi's mother has long passed away, his father has raised him alone until now. One day, Shinichi's father announced that he was dating a woman through a pairing app, he also wanted to remarry her. Although a bit surprised, Shinichi did not want to hinder her father's happiness. He thought he agreed to marry a man like his father, he must be a middle -aged and overweight aunt. But when she met her future stepmother, Shinichi was shaped from her beauty. His stepmother was Alice, a beautiful young girl, especially her big breasts that made Shinichi unable to take her eyes off! Not only that, Alice often dressed in cloth, even she only wore underwear after showering made Shinichi not knowing where to look! Alice's image kept appearing in his mind that Shinichi could not focus on studying. Even when going to bed, Alice appeared and made Shinichi dream! Not knowing what to do, Shinichi threw his sperm full of underwear in the washing machine. Alice discovered and brought those underwear away. In fact, Alice had a huge sexual desire, she used the sperm full of sperm to masturbate, but Shinichi witnessed it all. He also could not resist and took Alice's underwear to masturbate, just like she did. When he saw his underwear filled with sperm, Alice also knew that Shinichi was like her, masturbating when thinking about the opponent. So Alice immediately picked up the underwear to meet Shinichi, actively seducing him. Unable to resist the charm of Alice, the wrong relationship between stepmother and son -in -law started from there ...