The demon protector

Mike Jones isn't your normal human. In fact he isn't a human at all. He's a demon, with all the powers of a demon. So why is he a human in the human world? Well when he was a demon he did something even a demon shouldn't do and as punishment he got turned into a human; only to be brought back as a demon if he saved a life. So what happens when he saves a little girl's life and he doesn't want to go back?