Incest (or at least pseudo-incest) seems to be a big thing in the actual canon of a lot of things lately, so if it's showing up a lot in fanfic I'd say that's why. Arrested Development, Carnivale, Veronica Mars, and Lost have all dealt with incest over the last year, and those are just out of the shows I watch. Even The OC seemed to hint at it with Ryan/Lindsay (even though that made NO sense since Ryan is not actually related to any of the Cohens.)
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