Kayo Ishibashi (43) grows concerned about her son Masato, who has recently withdrawn from going outside. When she asks about his condition, Masato confesses that he was dumped by his girlfriend due to premature ejaculation. Wanting to restore confidence in her inexperienced son, Kayo carefully guides him through intimate training. As their bond deepens, maternal love intertwines with her hopes for his maturity, unfolding a tender yet poignant story filled with creampie and titty fuck scenes.