The second one:
All Manner of Monsters by spufette
Summary: Buffy Summers is Riley Finn's mistress. Riley is the head of the LA Irish mob. William Spike Sinclair is the man from Buffy teenage past who will shake up her present world. A brief warning: Buffy is Riley's mistress in the present, so 'Biley' must be refered to, sorry. I will not get graphic, sexually, with Biley...(don't you just love that term, Biley?????) Anyway, it will be Spuffy, really, in all the really important parts! Bad summary, sorry, but if you give this a read, I think you'll like it.
http://spikeluver.com/SpuffyRealm/viewstory.php?sid=11927&ageconsent=ok&warning=5