Spike and William are separated, threesome stuff, they have a baby

I remember this fiction that Spike and William were separated and William (was human) was able to make a child with Buffy before he went back "into" Spike. Later on in a sequel he comes back due to Willow talking dirty in bed to Wesley in sumerian. Wood is in this story and he's very hostile towards Spike/William.

That's "Three Come Blondes by Evenstar and the sequel is "Three Come Blondes Part Deux

Links..Three Come Blondes

Three Come Blondes Part Deux

{4/7/13 *** emailed Mhustler and asked her to come check this reply}

Yes, yes, yes this is exactly it. Thanks so much!! Thanks for e-mailing me P4S. So preoccupied with the GotR show that was coming up that I never looked back on my find-a-fics. Thanks!!

No problem, M! I knew what you'd been occupied with!