At least half of these I haven't read yet but they are here for your perusal in case any fit your needs. Hope it helps.
Acting The Part by pattyannehttp://spikeluver.com/SpuffyRealm/viewstory.php?sid=2567&warning=NC-17Summary: AU. William St. James is an actor on a hit television show. While appearing at a fan convention, he meets Buffy and her six year old daughter, Melanie WIP since 2005 but long...
The next one is very porny so if that's not your thing skip this one:
Star Quality by PaganBaby http://spikeluver.com/SpuffyRealm/viewstory.php?sid=845Summary: Buffy wants to be a legitimate actress. William wants to be a porn star. They meet (eventually) through a quirk of fate.
Warnings for: This is an extremely hardcore, raunchy fic folks!! Tons of explicit, graphic sex, multiple partners, slash, group sex, kink, anal, sex toys and objects used, bondage, deals with the seedy porn industry, angst, drug use, just about everything but the kitchen sink in this one! Wait...I think there is a kitchen sink scene in here somewhere... WIP since 2004 but very long...
The Superstar And The Single Mom by KatkinNo longer online but copies are floating around....
Summary: Buffy met William in a chat room three years ago when he was just an aspiring actor, as he rose to fame, he didn't tell Buffy because he wanted her to like him for who he was, and also he liked having her to himself. What happens when fame and every day life comes face to face? Can William, or 'Spike' as he is now known, convince Buffy that she's the one he really wants, and also will Buffy ever be able to forgive him for lying to her? Two Fool Things by Brathttp://spikeluver.com/SpuffyRealm/viewstory.php?sid=17260Summary: William "Spike" Giles is a 39 year old famous TV actor. Buffy Summers is his 27 year old best friend. Lately, Buffy is tired of hearing about Spike's womanizing ways and sexual exploits. Then he invites her out to L.A. to visit him on vacation. . . Some truths come to light, some life changes are made and a love that will change everything is discovered. Wilson's Mountain Diner by LoobyLoohttp://spikeluver.com/SpuffyRealm/viewstory.php?sid=35259Summary: Buffy's life in a sleepy stale afternoon soap opera is turned upside down with the arrival of a new bad boy on the block