The wife of a man who remarried after being a former company president's secretary. Even though her son was an adult, she worried about him staying shut up at home and, despite being his stepmother, she took care of him gently as a mother. One day, the stepmother entered her stepson's room to cheer him up, and she found her own panties that had disappeared from the laundry. Seeing her stepson frantically apologizing, the stepmother, troubled, forgives him with a gentle embrace. However, she is about to be pinned down and penetrated by her excited stepson...!