Half a year into their marriage, Reiko and her husband are still newlyweds. However, tension arises when her stepson, Fumiya, returns home for a visit, making interactions between him and his stepmother, Reiko, slightly awkward. One day, Reiko rushes to help Fumiya when he collapses from dehydration, entering the bathroom where she's caught off guard by his impressive, erect cock. Unable to resist, she begins touching it with her hand. When Fumiya notices, he pleads for more, coaxing her into bringing him to ejaculation. Soon after, the cycle begins anew as Fumiya proudly displays his youthful, rock-hard, insatiable cock to Reiko once again. The scene captivates with its intense tension and unexpected developments.