Mother Kanna lives with her husband and her teenage son. One day, her husband suddenly leaves on a business trip, leaving just the two of them alone together. Sensing his father's absence, her son begins to grow increasingly affectionate toward Kanna. She gently accepts his feelings, and their bond gradually deepens. When her son softly asks, "Mom, is it okay if I'm curious about your body?", Kanna responds with warmth, guiding his hardened cock to ejaculation. She carefully explains the mechanics of the female anatomy, eventually teaching him even the methods of making a baby. During her husband's absence, Kanna takes on the special role of a sex educator—not only as a mother, but as a woman fulfilling her deepest maternal and intimate duties.