Sister, Sister: The Story of Hava

This is the story of Hava. Hava Blasphemy Haddock. Her father, Stoick the Vast, lost his daughter to a dragon, but unbeknownst to him, she's still alive...and she's living with Timberjacks. Hiccup grows up without the knowledge of having a twin sister (No thanks to Stoick), but how will he react when he spots a vaguely familiar girl in a forest one day? (Slightly Post-HTTYD)