I know there are some, but are there any good and long stories about Twilight dating/married to either princess and having to deal with court of the nobles stupidity, especially Blueblood?

I find them very funny and they're pretty fun to read as well.

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I'd search the folders for stories by word count and see which ones look like there's already an established romance in. None really come to mind except an excellent story by bigbear (Teatime) and some by Cynewulf that fit that criteria.