While her husband is away on a company trip, her mother-in-law Narumi and her stepson are left alone for the first time. She tries to ease the awkward atmosphere by doing some housework, but... Her beautiful breasts shake as she wipes the floor. Her ripe, seductive peach buttocks move up and down. Her defenseless behavior unconsciously takes away her stepson's reason. When her excited stepson approaches her, Narumi initially refuses. However, she fears that a ripe gap will form between mother and son...