Trying to find an old fic...it's a short one, if I remember correctly, possibly only one chapter. Buffy finds out that Spike returned after the Hellmouth was closed, but thinks that he doesn't love her because he never sought her out. It turns out that she's immortal, so she spends year after year, watching him from afar with a spell. Her only companion is a dog that she names Spike. When her dog dies, she always gets a new one, and always names it Spike.

Any ideas?