One day, when Michiko returns home, she catches her daughter's boyfriend masturbating in her daughter's room. Mesmerized by his youthful, impressive cock, she finds herself getting aroused. A few days later, when the boyfriend comes by to pick up her daughter's forgotten belongings, she lures him in, teasing his desires and leading him into a sea of pleasure through various acts. This series of events brings a new shift to their relationship.