Mitsue has a close-knit family consisting of her daughter, granddaughter, grandson, and son-in-law. One day, while her daughter and granddaughter are away on a trip, she finds herself alone at home with only her grandson. Despite being over 60, her libido remains strong, and she feels delighted by this opportunity. She starts by teasing her grandson with a masturbation session, then eagerly accepts his young cock and experiences a forceful creampie. Unsatisfied after this encounter, Mitsue sets her sights on her son-in-law, seducing him with expert techniques tailored to his weak spots, quickly bringing him to climax with a creampie.