A girls' boarding-school in rural Louisiana in the late '80s. A girl has had a sexual relationship with her teacher, but it's all off. Her mother knows but doesn't much care. She confides in her cool new friend and, incensed, cool new friend resolves to punish the teacher and get him fired. She does so successfully. It has to be a relatively simple plan which can be contrived and pulled off within a couple of days, tops (hours is preferable). It can't be a criminal matter, or anything that would involve the police. I have a special hatred for the trope of the false rape/sexual assault accusation, but I guess that works? Basically, the admin has to assume that the teacher has done something wrong (other than having sex with his students) and fire him that day.