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Kristoff is a vampire. When he sees Anna he falls in love with her and deep down he wants to sic his fangs into her neck. Anna ends up falling for him as well but will she still love him if she finds out he's a vampire?
by the way Anna and Kristoff never met before but Anna does live with Elsa in the castle and she knows about her powers.
if your reading Elsa's dig then I'm including Rory init too.