Tsubaki lives with her husband and son. - Thirty years after her marriage, she still had a night out with her beloved husband. - However, recently her husband has also become weak, and she can not easily get acquainted and cheats as "cool" every day. - Tsubaki was hiding behind her husband and masturbating alone every time. - One day, her son came home with mud. - Tsubaki tries to care for her son who has fallen asleep at her front door. - She stretches out her hands as she catches on the bulge of her son's pants, which grows big before she knows it, and even straddles it ...