Little Spike and Buffy?

I read this fic one time where I think some sort of spell went wrong, not sure though, but anyway afterwards both Buffy and Spike turned into children. They got along real good but not in the beginning I think. I've been trying to remember what it was but I can't. If it helps any, I remember this one scene where Angel comes over (because Giles was taking care of Buffy and Spike) and he refused that Giles stake Spike. Does anybody know what it is?

Innocence Found by spikes_heart?

Frina
Yes! Thank you! I've been trying to look for that story for a long time. Thanks!

Link:

Innocence Found by spikes_heart

http://dark-solace.org/elysian/viewstory.php?sid=803

Summary:Still going through the motions of everyday life and slayage, Buffy and Spike come across a demon that changes their very existence.