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Makoto was disturbed by the nasty voice of her mother, Miki, heard from her bedroom. I knew my parents were planning to have new children, but I didn't feel like cheering. What springs up is not the joy of having a new family, but the jealousy of my father who makes my mother make such a nasty voice. And it was an exclusive desire not to give my mother to anyone. Every time I hear the voice of my parents' activities at night, my distorted feelings get stronger ... And finally Makoto implements the forbidden plan. It was to fill Miki's vagina with her sperm and expel her father's sperm.