Night Fury Hiccup

This is gonna be a pain in the ass to explain how I got this idea lolz, but here goes:
From the story Humangon on Fanfiction.net and on DA I got inspiration, so I started to draw in my scetchbook (from that one I am going to post the pictures in recentness in the right order, from oldest to most recent).

The idea I got from the story (also other stories BTW) was that Hiccup started to change in a Night Fury.
After that I started to draw digital. Beginning at the most recent one in my scetchbook. I got a whole Idea in my head how he got there, captured and all.

In the picture:
He is put in one of the dragon keeps at the dragon killing arena. The changes started when Stoick just left on his month long voyage to search for the dragon nest in the movie. Mildew (You know who that is if you have seen the tv series of HTTYD on Cartoon network) discovered the changes hapening and managed to convice most of the village to lock him up sice the early days of his changes.

Now Stoick has returned, discorered what is happening to his son and rushed to the killing erena to look for himself. Hiccup has claws, ears and spikes. and scales all over his body and a tail. His wings still need to grow painfully out of his back.
He is standing in front of the cell in shock.

Hope you all like