The fic has 5 parts and can be found on Sinister Attraction or her site.
http://www.sinister-attraction.net/stories/r/castaway.htmhttp://www.ripewickedplum.com/sa/castaway1.htmThe fic at EF isn't all of what has been written.
Even though it says it's 5 chapters.
The other 2 have where the WIP really left off.
There is a lot more to this story.
The last lines at EF.
"Where are you going?" Buffy called out, going to the door, and Spike glanced back at her, "Well...we're gonna need a nursury of sorts, right? Better get cracking if we want everything ready by then!"
Buffy shook her head with a smile as she watched the vampire rush off into the trees, then rested her hand against her belly. "That's your dad, kid...yeah...I'm scared too."
The end of part 2 here is that part.
http://www.sinister-attraction.net/stories/r/castaway2.htmJust showing how much more there is to read.

It's the same on her site.