I can't believe my mother makes such an erotic voice...Her mother, Yukari's voice, comes from the bedroom of her parents who are working hard to make her baby.Shinichi's heart was disturbed by that voice, and he realized that the affection he had for her mother was not normal.Jealousy towards his father was welling up.He wishes to take over that position.Unable to suppress his impulses, Shinichi attacks Yukari.He devours her body while making her say "I love you" over and over again, and finally shakes off the restraint and dares to vaginal cum shot.The ultimate goal of his twisted desire was to expel her father's sperm from Yukari's womb with his own sperm.