Buffy has affair w/Teacher Spike - Willow tattles

I'm tired of searching. LOL! Buffy has an affair with Spike, who's her teacher. Willow misreads the situation and tattles on them. Later, they meet up in college, and rekindle their relationship. At some point, I think Spike is prosecuted for their affair, and Buffy lies in court for him by falsifying medical records. Buffy does find out about Willow's betrayal and maybe slaps her?

I'm almost nervous I'm mixing two different fics up. Possibly taking parts from Mr. Williams and another fic, but I'm not sure.

Little help?

Guardian by Pyro63
Summary: When Buffy's mother and step-father die in a horrible accident, Giles's half-brother Spike and his wife Cecily step in to take custody of 16 year old Buffy. But as weeks progress and Spike gets to know Buffy more and more, he finds his attraction for her growing. Can Spike handle being the guardian to Buffy without letting his lust take over? Or has he bitten off more than he can chew? Warning: This deals with a relationship between a 28 yr old and a 16 yr old, so if that squicks you out don't read!!!
http://spikeluver.com/SpuffyRealm/viewstory.php?sid=26872&warning=5
This meets all the other criteria except Spike is Buffy's legal guardian, not her teacher.
Willow finks, Buffy lies in court, Buffy slaps Willow and reads her the riot act for meddling.

Augh! *bangs head on desk* Now all the pieces fall into place - and why I couldn't find it. This is the one! Thank you so much - you are ACES!! <3