I remember reading this really good fic (or I think it might have been a three-part series) where Buffy's father is a good friend of Spike's. Spike and Buffy fall in love and the fic deals with how they come to terms with it. I think Spike had a penthouse in it and was a well-off businessman. A later part described their wedding (if I remember correctly). It's been quite a while since I read this story (years) and I realize that there are many that could fit this description. If someone is able to find it, I would be eternally grateful. | 
