Anothet Night Fury?!

What happens when Hiccup and the rest of the dragon riders find a girl on one of Viggo's boats? What happens when Toothless knows this girl? When she too has a Night Fury.. not just any Night Fury ether, Toothless girlfriend? When this girl has abilities that Viggo wants? What happens when new characters are added? Will Hiccup fall in love with her?

I'd like to say that Hiccup and Astrid are not a couple they're just friends and Astrid is not gonna be a bitch, I'm still to read a httyd fanfic where Astrid isn't a B*tch so I thought I'd make one. Hope you enjoy!