A mother and son living quietly in poverty. As the son grows older, his feelings toward his mother gradually shift from filial to something more. Meanwhile, the mother, too, begins unconsciously developing desires suited to her age. One day, she discovers semen stains on her son's underwear and, without thinking, finds herself inhaling its scent—overwhelmed by uncontrollable lust. Witnessing this scene, the son can no longer hold back, crossing the line of restraint.