A bit more

"Only after class will you realize what is written on the board, but before that, if any student talks about what's on the board, you will just say 'it is what it is,' and if anyone points out you have something drawn on your face, you will ignore them, and if anyone mentions anything about your clothes, you will also ingore them. You won't realize what's on your face or what's wrong with your clothes until you look in a mirror. Tonight you will be very horny and want to go to a bar and find a guy to jack off with your hair in the men's room until he cums in your hair. Then you'll leave it there until tomorrow morning."

John thought he might have been a bit mean, but his power went to his head, and he did not care. "You will stay still until you hear your classroom door close."

He took off the hat left the room, and closed the door.

John walked on down the hall, at this time of day, there were not too many classes, but passed a classroom, and something caught his eye. A bored blonde with a brunette with her head down on her desk, as the professor had his back to students as he wrote equations on the board.

He smiled. "I could liven up this class," he thought.