I've seen a few, but the only one I've got bookmarked right now is Sires (http://kanedax.livejournal.com/137949.html) by kanedax. In my own private wishverse (which I keep saying I'll write someday) Willow got vamped by Darla in the equivalent of "The Harvest" and then vamped Xander within hours of waking up as a vampire.
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I've seen a few, but the only one I've got bookmarked right now is Sires (http://kanedax.livejournal.com/137949.html) by