The son deeply loves his mother, unable to suppress his desire for her body. Meanwhile, the mother, overwhelmed by guilt and taboo, cannot deny her own feminine pleasure. As a result, an illicit relationship forms between them, and their twisted affection grows uncontrollably. In this situation, two other couples facing similar circumstances meet, causing forbidden emotions and jealousy to intertwine, giving birth to new desires. Soon, the immoral act of mother swapping occurs once again, leading to a repeating tragedy.