Teeth

In a small town near to a nuclear power facility, the chaste Dawn is raised with her dysfunctional stepbrother Brad by her mother that is sick and her stepfather. Once in high school, she participates of a meeting called "The Promise O" that preaches purity and virginity for the members. When the newcomer Tobey arrives in town, the naive Dawn feels that he is her soul mate and stays close to him. The proximity becomes attraction and Tobey does not control his hormones and forces Dawn to have intercourse with him in a cave in an isolated lake, with unexpected consequences. Only a hero can rescue her.