Honestly I think you should of gone for something more normal having a dragon as his animagus basically lifts him to a dark lords level of power all he would have to do would be transform to win.
Honestly I pay for a few p**reon stories but the release rate and no word of how many if any advanced chapters if get for my money I don't see the point In paying.
Honestly was a great chapter was enjoying the crazy lucks he seemed to know what he was doing and only acted like that when it was necessary the whole part after poppy shot billy ruined it.