Pari, and all, might help to look for possible AU after Hush or before it. I have read this story too. I'm trying hard to remember. I am almost positive that it's a claiming fic, because I think Spike and Buffy could commune to each other.
It was rather funny too, the drawings. One at the end has a very well drawn picture of himself (Spike) in vamp face killing. The context though, was rather funny. Lots of innuendo's too, especially when Buffy does the stake motioning too.
I looked through Ariel Dawn's, Slaymesoftly's...still haven't come up with it. I'm still looking in between work