Buffy/Spike falls under the "(what they consider to be a) canon pairing" exception--although given the timultuous nature of Buffy/Angel and Buffy/Spike in the fandom, I wouldn't be surprised to hear people recommend warning for these as well. So Buffy and Spike can canoodle all they like (in some gen fans' formulations, up to and including NC-17 explicit sex) and it's still gen, but if Buffy and Xander are so much as briefly mentioned as having gone on a date, that's het.
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Date: 2007-03-30 02:28 am (UTC)Boggles, the mind does indeed.