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A man lies exhausted in bed, having just escaped his stepdaughter's birthday party, when she enters the room with a rather unusual request: she wants him to make her a woman, as simply reaching adulthood wasn't enough. With extreme submissiveness, she begins to seduce him until he can no longer resist, and they end up committing a terrible sin, from unprotected sex to rimming and anal sex. The two embark on an adventure of absolute lust.