The chemistry of human sexuality.

You take a slow walk back toward your desk, allowing your classmates to enjoy the view of your tyrannical teachers naked backside. When you pull a small, purple vibrator from your bag, the class gasps, but starts to whisper excitedly. "I think we can use this time to truly learn something important." You say, slowly walking toward your bound teacher, who has yet to see what you're planning. "Something important about...the chemistry of human sexuality..."

She gasps, "No! Absolutely not!" but she is in no position to do any more than beg. With a smile, you turn the knob at the bottom, bringing the vibrator to life. You run the tip of it along the exposed lips of her pussy, causing her to twitch and yelp quietly. "No! Please! Not in front of my students?!"

"Well if we don't do it in front of your students, how will they ever learn... for that matter, how will YOU ever learn?" you continue, gently rubbing her labia, as she tries as hard as she can not to enjoy it. It isn't until you lightly brush past her clit that she lets out a low moan despite herself. "Someone's having a good time!" you shout, as the class chuckles.

"Please don't. Oh god... oh god no." she moans, as you notice her clit beginning to grow as she starts to get wet.

"Ah and here we see the beginning of arousal. You'll notice she seems to be enjoying herself quite a bit." you go a bit deeper with the vibrator, making her squirm uselessly. Her hips jerk involuntarily, shaking her curvy ass for all in attendance. "That's right. Just enjoy yourself, Ms. Victoria."

"No...nnnnooooo" she moans, as you press the toy up against her clit. "Please, please stop. Don't make me cum in front of everybody. I'll do anything!"

This is when you stop, leaving her to lay across the desk she's cuffed to, breathing heavily, part of her slightly disappointed.