After her husband passed away, Yumi raised her son Nobuyuki single-handedly. Recently, she noticed that her son had a girlfriend and, despite her mixed feelings, secretly watched over them. One day, her son confided in her about his premature ejaculation and inability to satisfy his girlfriend. Troubled, Yumi decided to train her son sexually, attempting to stimulate him with handjobs and blowjobs, but Nobuyuki's premature ejaculation did not improve. Eventually, Yumi decided to use her own body to teach her son sex…
