After their father died, Aya and Koji, who were left with only one parent, decided to move in with their father's older brother, Tomohiko, at his parents' house. However, after a month, Tomohiko began to have a physical relationship with Aya and acted like a husband. He then started to treat his son coldly, and Aya had mixed feelings. This was because she was connected to her son in a forbidden relationship... And the son, angry at Tomohiko's interest in Aya's anal passage, violated his mother's virgin anal passage to show that she was his...