While her husband was away on a business trip, Ayano made a mistake with her only son, Satoru. Mother and son tried to keep it a secret between them, but... When her husband's business trip ended, the three of them started living together as a family. With the father at home, mother and son refrained from having sex... However, the mother and son became frustrated and gradually could not bear it any longer. When the father was not around, mother and son continued their relationship secretly... And the moment the father went out, mother and son began to desire each other intensely!! Before the father returned home, mother and son had a ferocious sex session, trying to reach climax!!