Silent teacher jerk of encouragement! I have kept you behind after class to do extra work because you have been disruptive. You find it very hard to concentrate though when you realise you can see straight up my skirt from where you are sat. I look up and see you are perving on my panties! I surprise you by teasing you with my outfit and body. I unbutton my blouse to expose my boobs and push my panties to the side while silently instructing you to take your cock out and wank until I tell you to cum!