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Yuffientine is the shipping of two characters from Final Fantasy VII: Yuffie Kisaragi and Vincent Valentine. It isn't yet confirmed in the actual videogame or Advent Children, but it does seem like Yuffie Kisaragi had a crush on Vincent Valentine in Dirge of Cerberus.
I'm going to write a Yuffientine fanfic today.

Did you see that Yuffientine AMV with the Chasing Cars song?
by Pollymon December 30, 2007