I catch you cheating on your exams, I embarrass you in front of the class and your classmates. This is your last year, and your record must be clean when applying for college. Now your future is on my hands.
I invite you to my office. I show you the key that holds all the answers to your problems. As a teacher, I know that young people are going through changes in their bodies, and that doesn't allow them to have clear minds when it's time to take their final exams. The solution? A chastity cage that you won't be able to refuse because I can call your house and tell them what you did. The best way to control your body is to discipline it. You'll have to pass a big and juicy second test if you want me to free your blue balls the next week.
If you cage leaks when your nose stick in my asshole, you lose! Are you ready?