Fic where demons spy on spuffy making out

Hi, I'm trying to find a fic where someone sets up an observation window type thing so that people/demons can spy on Buffy and Spike being... ahem... intimate. I think Riley or Xander end up seeing them through it. Any ideas?

that could be Facing the Mirrors by 1st Rabid

http://www.shadows-and-dust.co.uk/Fiction3/facingthemirrors1.htm

I recall a fic similar to that, but Buffy was kidnapped and being auctioned in an underground demon auction. Spike is there and he purchases her, but before they can leave they have put on a show for the paying demons, a pay-per-view show. So they have sex in a viewing room while demons watch. Not sure if that's the fic you're talking about.

I read that one. Can't think of the name though..ugh

Is it Slayer for Sale

Summary: Spike is at a demon auction, and what does he see? A fair maiden in need of rescue...the Slayer herself...

Thanks Tazandhooch, that's what I was thinking of. Thanks also to Pari/DramaQueenLucy, I will check out Slayer for Sale.