Buffy having to come to terms with the fact that it's not always about her - a terrible shock even if the sight of the two of them together is hot.
Exactly.

And those expressions of face and endearments she assumed were only ever for her.
*nods* As I said above, it hinges on the very specific set-up I've got here - Spike and Angel spent half a year together, just the two of them, and got very, very close.

Very interesting.
Thank you! :)