Buffy and Gun undercover, work for Spike. She is a comp genius, falls for Spike, Angel is a murderer

I am looking for a fic i have read. Buffy and Gun go undercover to work for Spike and live in his place. She is a computer hacker/genius and Gun pretends to be her boyfriend. Spike works for Angel who is like a mob boss. Buffy end up sleeping with Spike and falling for him. Also has Giles in it as Buffy and Gun's boss, Fred works for Spike, Dru is married to Angel but he's sleeping with Darla.

Sounds like Crystal by Vanilla.

Summary: A beautiful blonde is undercover for the FBI in Los Angeles. She is working as a computer hacker for one of the country's richest, dirtiest, and most handsome businessmen, who just happens to have a few secrets of his own. Sparks fly, because don't they always?

http://spikeluver.com/SpuffyRealm/viewstory.php?sid=29757&warning=NC-17

Yes Thank you!!