A stepmom, Lauren Phillips, is called to school to pick up her teen stepson, Elias Cash. She is shocked when the teen's very conservative teacher, Annie King, demands that he is taken home after accidentally dozing off in class and getting a boner. Annie is disgusted by his erection while Lauren thinks she's being way too uptight.
As things get tense, Lauren becomes overprotective and challenges Annie's prudish ways, which leads to her jerking off and having sex with her stepson right in front of her to make a point! Annie is stunned but inexplicably aroused, which leads to Lauren taking pity on her and inviting her to join them in a steamy threesome.