Paindreamer05,

First consider a couple of things: Can you write? I hate to hurt someone's feelings, but the fact that you're asking for starter ideas suggests you may be challenged in this area. Lots of us have fetid, perverse imaginations, and coming up with nasty ideas of what we would like our protagonists do to innocent young ladies is never a problem.

Write about what you would do if you had a magic wand and could create the environment and victim(s) you would like to hurt. Paint the larger situation first: the school, the nature of the student body (pun: ah, student bodies!), and whether your victim is representative of them, or different. Picture her in your mind--you might write out her physical and personality characteristics so you can make sure you don't write "small, delectable tits"
when you wrote "large cantalopes" ten paragraphs back!

(I always encourage writers to include exotic descriptions of pretty lingerie, including slips. Don't girls wear slips anymore?)

Then decide on who is going to punish her, and whether it will be done as part of/in front of a larger group, or in private. A school gymnasium late in the afternoon could offer lots of equipment for punishing your little miscreant! How about the school boiler room?

Figure out before your write your story the psychological end-point: what is going to become of your victim? Will she be a sex slave? Will she endure the torment, then be forced to return to a "normal life?" Will she be "ruined," (deflowered and emotionally destroyed) (my preferred ending) to use an old Victorian phrase? Snuff? Something else? Figure out ahead of time.

That said, I'll give you a n/c scenario I don't see enough of, and suggest you consider it: There's nothing like a beautiful, virginal girl, flat on her back, her clothes ripped to shreds, her skirt pushed up and spread about her hips, while she gets a good hard rape! This would involve bringing in a male. So think your story out, in full.