He at least pretends to

"Ugh, fine... it's less trouble, at least. You know what? I'll send you the nurse, and you just copy what's on the board and have the rest of the lesson for yourself. Not that anyone will listen with that spectacle going on..."

That was the perfect outcome, as far as Nikki was concerned. She almost felt a little bit bad for the math teacher who, while grumpy, was genuinely competent most of the time. But him being gone opened up the perfect opportunity to get some really good footage of poor, sexy Kiyomi's predicament!

The very moment he closed the door behind him, everyone got up and moved in on their masturbating classmate. Nikki assigned someone to watch at the door for the nurse, then helped move aside the desk, so they could see better. She wasn't very concerned with keeping up appearances at this point, as Kiyomi was too far gone to notice or deduce anything at this point, and there was a bullshit explanation available for most things anyway, convincing enough for the naive exchange student at least.

They formed a circle around her, camera-phone-bearing students in front, and the girl with the camcorder pointing the device point-blank between Kiyomi's legs. Boys and girls watched in awe as the sweating, moaning Kiyomi 'scratched' her pussy. The juices were flowing freely now, dripping down onto the chair, slowly forming a puddle, and it was all clearly picked up by the recording devices. And Kiyomi was aware of this; at the edge of her consciousness she perceived it and understood the gravity of it, yet the only thing she could focus on was trying to find some relief for the itching; and gradually, also, for the intense sexual arousal that was coming to the foreground.

There was no helping it; the itch was on the inside, so that was where her fingers needed to go. Knowing full well that they'd have footage of her frantically fingering herself, she did just that. Index and middle finger plunged in, crooked to attempt a scratching motion, as deep as she could manage. In and out, rotating to reach the spots of her inner walls that were itching the most. The wet, sloppy sounds of her masturbation were getting louder along with her high-pitched moans.

As entranced by the show as everyone else, Nikki was nevertheless considering to stop her from going further. It would be delicious to have an **** close-up of her orgasm like this, but it could be more useful to keep her on edge for the rest of the day, and maybe arrange for a much more public climax. The lookout interrupted her thoughts, though. The nurse was coming.

In the seconds before she entered, they quickly hid the phones and the camcorder, reassembled in the circle, and tried to look concerned.