Future AU, Slayers supposedly extinct

Hi guys, I thought this fic would be easy to find as I've re-read it several times over the years. Can't find it having been requested in the forums either, so here I am.

Future AU, some kind of factory or estate, Buffy is undercover trying to rescue Dawn. She ends up hiding in Spikes private quarters and they pretend to be having sex when guards come looking for her. Spike tastes her blood and knows she's a slayer, though I think they're supposedly extinct?

Thanks in advance!

Nevermind, found it! If anyone's interested, it's Winds of Change by Maryperk