I have to protect who??

This is my first time writing so I hope you enjoy.
This story is about a guy named Nathan who has to protect this kid who always reminds him of his little brother who was taken away from him, but Nathan is something more than just a babysitter he is the most powerful being on earth and no one can defeat him, well his brother can because he doesn't want to hurt him but that's it and Nathan is also a giant white haired fox with beautiful blood red eyes, but anyway he has to protect John because he has a little less than half of Nathans power but still that is very powerful and people are trying to kill him for it. So follow Nathan on his quest to protect John. And along the way you will find a little humour.