A shaky little surprise

You're dancing with Bertrand, a guy from your Chemistry class, for the second time. You're a little surprised that he asked you again, especially since you flatly turned down his offer to sneak off and make out, but he apologized for being forward and he is a good dancer. The last time was a rock tune, now it's a slower love song and he's being a reasonably perfect gentlemen if you don't count his hand being about a quarter-inch too low on your ass. You don't really want to call him on it so you just sway to the music and pray for a chaperone.

As the song draws to a close he draws you in for the obligatory hug and peck on the cheek, but something's wrong. You feel his ass-hand moving under your dress and between your legs. Before you can pull away you feel a moment of pressure and something pushed into your vagina. You back off and glower at him for copping a feel, but notice the feeling's still there.

"Bert, what did you just do?"

He smiles wickedly, "This."

The vibration starts between your legs and slowly shifts upward. Whatever he put in there is some kind of vibrator, and it's working its way deeper.

"Next time you'll know better than to shoot a guy down."

"Bert you asswipe!" You really want to pound the shit out of the little prick but the vibe device is definitely having an effect. You can feel your insides getting hotter and moister.

"Is something wrong here?" Miss Henderson's voice causes Bert to flee. Normally you only see her in her gym-teacher sweats; right now she's in a cream-coloured dress that totally reinforces her first place position on the 'teachers the whole class would like to fuck' list. Since Bert is gone she turns to you.

"You should try to curb your language, Ariana. You're normally a much more polite student than this."