After being laid off, her stepfather suddenly changes and forces her mother into violent sex. The stepfather gets a taste for it and now his poisonous fangs attack his daughter as well. The daughter, who has been at the mercy of her brute stepfather for the sake of her beloved mother, falls into a series of obscene acts beyond her imagination, and before she knows it, she begins to desire them herself, even begging her stepfather to impregnate her.