You are late again and your professor is mad. She is so angry that she wants to humiliate you a little. When she tells you that you are going to jerk off in front of her, you become excited. Then she reveals that you will be jerking it in front of the whole class. That must be the humiliating part. Fine. She tells you to spit in your hand as lube for your jerk session. Start jerking it right now! OH NO! Your dick isn't getting hard until she starts talking trash to you. You pick up your pace and begin to enjoy your "punishment" when she shows you her bra. You never before noticed that she has a few tattoos and then she takes off her bra for you! Keep stroking it... don't stop now. When you finally pop, she will begin the class, so try not to delay it much longer. Maybe showing her ass to you will make you jerk it faster? That is all you needed and you give her just what she wanted: a BIG POP.