Ten years ago, Mai Ko lost her beloved husband to illness and has since raised her son alone. As she grows older, her increasing sexual desire becomes intensely drawn to her son, who is maturing from a child into a man. Reminded of her late husband's image, she is overwhelmed by uncontrollable urges. She deeply desires her son's body, who still knows nothing of women and treats her with pure, innocent affection. Ultimately, she guides him into her vagina, forging a new, forbidden relationship between them.