You're in detention for failing to follow direction in class. Your strict, sexy teacher is going to ensure that you learn how to take instruction. You are going to be told exactly what to do with your penis, how to stroke, when to stop, etc. and she will carefully observe you to ensure you are performing perfectly. Some of this will be challenging, you will be tested, but in the end you will earn her permission to ejaculate...right on the classroom floor, so when you see the stain tomorrow you'll be reminded of your lesson.