Watch as a Sassy and brutally honest Harry go through Hogwarts, having not only been exposed to a demonic entities, but divine entities as being of Heaven regularly interact with him, caring from him and constantly trying to get him away from the Devil himself. Magic is trivial to Harry as many of the people he interacts with are on a different level to regular mortals, with very different standards when it comes to doing magic. After all, no one has seen the devil ever use a wand.
As an addition, you could also have Harry be highly successful at seducing males and females of all ages, until a certain french blonde which comes across his path, someone who doesn't fall for his initial charms.