Special selection: Friend's mother

Reiko, who lost her husband and lives with her son Eita, ends up having a relationship with her brother-in-law, Kosuke, while she receives help from him. When her son reached his age, she decided to end their relationship, but Reiko's body was no longer satisfied without Kosuke, and they continued their relationship... One day, her son's friend Yu, who came to the house, witnessed Reiko and Kosuke having an affair. Yu uses this as a joke to threaten Reiko. Reiko tearfully responds to Yu's innocent and cruel request, but Eita finds out...