Sei was disturbed by the lewd moans of his mother, Mihi, coming from the bedroom. Although he knew that his parents were planning to have another child, he had no intention of supporting them. What welled up inside him was not joy at the prospect of a new family member, but jealousy towards his father for making his mother utter such filthy sounds, and a possessive desire to keep his mother all to himself. Every night as he listened to the sounds of his parents' lovemaking, these twisted thoughts grew stronger... Eventually, Sei decided to execute his forbidden plan: to fill Mihi's vagina with his own sperm and expel his father's.
