It has a fitting title:
Doing it for DaddyWARNING! This story contains taboo issues. By consenting to read it, you claim to be of legal age to read such a story and you release the writers of any liability. You also take responsibility for what you are about to read and will not blame the writers if you are of-fended. This story has incestuous undertones throughout and deals with a very taboo relationship that the writers do not con-done in any way. It is merely being written because, to our knowl-edge (even though it has been done with different pairings) this particular pairing has never been done in the Spike/Buffy fandom. This story is not allowed to be posted on any site/archive.
Summary - William Pratt and his daughter Buffy spend sixteen years being oblivious to the fact that they have underlying feelings for one another. When dreams have the potential to become reality, maybe something so wrong can turn into something right.The link goes to the first chapter but you have to friend the LJ and be friended back.
Another link for Ashlee's LJ (the Tag for this story) is
this. But as above, you have to friend Ashlee and be friended back.