Bound nude in the Humiliation Position with their rumps in the air and their heads shackled by their necks to the desks, their shame seem great. However worst was to come. Their young bodies were soon to experience what Oracle had dubbed, the education of the ass. Unable to turn their heads all 4 screamed as the machine began its activity. The machine inserted a vibrator into the rears and withdrew while sending down sharp pokers onto their cheeks. None of them had ever experienced such unpleasantness. They screamed as again and again, the machine would drill into their vulnerable posteriors and smack them with the pokers. Oracle approached them in her wheelchair and waved at them as she wheeled past. She then activated a lever. Whirling feathers from underneath the ground began assaulting their feet and writing vaginas.

Not really all that interesting but damn funny story... I'll post an interesting one if I find it...
Disclaimer: I didn't write one...