This one is kinda/sorta like you're looking for - I think. Besides anything written by bittenandstaked is a good read!
There's More to Life Than This by bittenandstakedAll Human AU. Summer is every man's wildest dream, the perfect girl in every single way imaginable coupled with the voice of an angel. Everyone in the world loves her, everyone wants to either be her or be with her. But there's a catch--she isn't real. Spike Thornton knows this all too well, his estranged father is the man responsible for creating the virtual girl, the girl he sees as a monster, and as fate would have it, Spike will be the man to destroy her. But can he save someone at the same time and show her there's more to life than this?
http://replay.waybackmachine.org/20060117052021/http://www.talesoftheslayer.com/there smoretolife/theresmoretolife01.php