I have decided to keep you behind after class because you have not been paying attention. I tell you that your punishment is to jerk off in front of me. You refuse and say you don't want to. I tell you that it's the only way to pass my class. You reluctantly pull your cock out and start jerking. I am amazed at how big it is. I mean I assumed you had a big cock but seeing it now, WOW. I encourage you to jerk off and even start touching myself because it is so hot watching you. Hopefully now you will start paying more attention during my class!