- The voice of her mother, Reiko, leaking from her parents' bedroom. Kosuke was dismayed by the voice that was too erotic. My friends said that when they got a glimpse of their parents' sex lives, they were stunned. - However, intense emotions that cannot be suppressed boil up inside me ... - The emotion is jealousy of her father, who makes her mother make an erotic voice. The possessiveness of wanting to make her mother's love her own. And it was a forbidden desire to fill my mother's vagina with my own sperm that was poured with my father's sperm.