Two Blades Strike (HTTYD Fanfic)

Two twin sisters are separated at birth; one taken by dragons and other runs away to be the most well known and feared pirate.

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In a world where things are different... What if Hiccup was a girl? Or two? Only their names are not Hiccup. They're Scarlet and Slade. Or as some better know them, the Hybrid Rider and the Shadow of the Seas...