Hm, getting back together with an ex. Heh. Good for you guys. Sometimes these things work out, or so I'm assured by those who've done it.
However, I rather think there's more chance of Buffy turning gay than me getting back together with my ex.

Not so much shining, more of a buffing is necessary now, I think. All things new and shiny, if you know what I mean.
As for Willow and Tara, I think they would have each spent a good part of the night apologising for any mistakes they might have made. Which y'know, would have been very hard to do with their mouths full. Ahem.