Suggestions?

"Mispaddled" by Tiptopper is a F-F mistaken-identity (young teacher for student) spanking story which I greatly enjoyed... --C.K.

'Halfway House' is a movie in which a female cop goes undercover in a reform school, and gets a dose of the paddle (offscreen, though there's a good onscreen paddling of two students to make up for it).

(This may be a bit off-topic if you're only looking for spanking stories.)