Hiccup's long lost twin?

What if Hiccup wasn't the only runtlike child of Stoick? What if he had a twin sister? Well, he does. She was carried off by a Monstrous Nightmare, when she was 5 months old, and has this talent with understanding the dragon's feelings. She was brought back to Berk, by accident, when the Nightmare was shot down and...

bubblegum bitch / hiccstrid

one has osteosarcoma, the other has dyslexia. one has a heart disease, the other goes suicidal.