Not a normal high school fic

Hi all! I am looking for a fic that takes place in high school, but it has a twist! Buffy is (supposedly) Spike's student, but towards the end of the fic it's revealed that she was actually undercover to get information on (his wife) Dru. Spike and Drusilla end up divorced and I'm pretty sure it's a happy-Spuffy-ending. I have been looking for this fic on my own forever, and can't seem to find it! (I think I've read every other high school fic out there though...just waiting to see if it will be the one with the twist ending)
Any and all help is greatly appreciated!!

That was asked for here before I think (and seeking spike). Or at the old forum.

I only found a link where Buffy is undercover for another story (Mafia, not high school), will check my links again later. (I can't remember the title at the moment).
The other story I was reminded of is Over The Summer by SlayerFan. It's still at FF.net. But there wasn't a undercover part, only that Buffy vanished later.

*edit again* Found it:
https://www.spikeluver.com/Forum/index.php?action=vthread&forum=2&topic=190
spike is a english teacher and married to Drusilla. he begins a relationship with buffy thinking she's 17 or so. Dru blackmails them and buffy leaves. it turns out she is actually an undercover FBI agent and she is like 28.
And it got answered:
it's by sam52. it's been taken down to be worked on. when i asked over on seeking spike she said she will eventually put it back up.

The title wasn't mentioned but it sounds like the story you're looking for.

The story is finished on FF.net. Buffy and Spike are together an it says, The End.

I *love* Over the Summer! Great fic... sounds like this one by sam52 is the one I'm looking for though... any clues on the title?? I couldn't find it on FF... there were no listings under "sam52" in author search.

Use the URL above posted by cordykitten.

No, not for "Over the Summer"... the other one, by sam52. Just wondered if anyone knew the title of it??

I wish I knew the title too, so when it pops up again (hopefully) I'll know what I'm seeing. Does anyone have the title, just for the record and identification? Thanks.

it's called "against all odds"