Aya never expected that a single mistake would change her son so drastically. When her husband was away on a business trip, she was so lonely that she made a mistake with her son, and since then, her son has repeatedly sought out Aya. Even though she tells him that this kind of relationship is not allowed, he won't listen. On the contrary, Aya's body also feels aroused by her son's caresses, and the two become immersed in a forbidden relationship. And finally, her son begins to seek Aya even when his father is at home...