Mako, who married an older husband, was unable to get along with her stepchild. One day, her son was peeking at her husband and her relaxing figure. She desperately pleads for her son to accept her as part of her family. Her son, who was secretly infatuated with Mako's big breasts, takes advantage of Mako's weakness and demands that she rub her breasts. Even though she is confused, Mako accepts her wholeheartedly wanting to close her distance. However, her demands gradually become extreme.
