I can't help notice that your grades are slipping and you seem preoccupied in class. You're one of my best students, and this concerns me. I take a special interest in those students who show great promise, and you're one of them. There's nothing to be embarrassed about. This happens often with my male students. Plus, I understand that it could be hard to hide your immense erection. I have an idea that is sure to help you refocus during class. You are to meet me in my office before every class, unzip your pants, take out your big black cock and stroke it for me. I want to see you release your huge load. Lets start now, shall we?