The Cloaked Twin Sister

Throughout the movie, Hiccup was alone. He had always been different from the others - scrawny and smart while the "normal" code was brawny and burly. But what if there was someone else just like him? Aleda, Hiccup's twin sister, was always wearing a cloak. What was her reason? Takes place a year before the movie. Rated T for some mild violence, but language should be K. REWRITING