The Perfect Teacher (2010) on Netflix

A spoiled, selfish teenager becomes infatuated with her teacher. She befriends his daughter as a way of worming her way into the family, and sets about manipulating every aspect of his life.

Beautiful and spoiled high-school student Devon Cory always gets what she wants. This time, she wants her handsome math teacher, Jim Wilkes, and when Devon sets her sights on the recent divorcee, she makes every effort to insinuate herself into all aspects of his life, including coming in between him and his girlfriend, Rachel. As Devon's obsession with Jim grows, it becomes clear she won't take no for an answer and will stop at nothing to secure his affections. Unfortunately for Jim, it might be too late before he realizes that Devon is hardly the perfect student he thought she was.

—Anonymous