Trying to keep her relationship with her husband a secret from her son, Asuka cherished their time together while maintaining her daily routine. Unaware that her son was watching her every move, she continued to deepen her bond with her husband. Then one day, her son discovered that his father was going on a business trip, causing his desire to surge uncontrollably. As Asuka's body is touched by her husband, a new ripple of forbidden emotion begins to stir within her son's heart.