To Drown or Burn... or Let it Get You

Percy Jackson is left alone in the aftermath of the Giant War and after a three-month coma, he is stronger than ever. He can disarm an opponent in less than a second, and get a bullseye with a bow and arrow from twenty feet away, yet he is an emotionless statue. The war took everything away from him, even his personality, it seems. Chiron is at a loss of what to do for the hero and sends him to become a bodyguard for a certain young, famous wizard in the hopes that someone there may be able to help him.
But will anyone think to question Percy's new behavior, even Harry Potter himself?
And if they do, will they be able to heal the battle-worn teenager's personality?
And what will happen when a new enemy arises?
Will Percy be willing to dive into yet another war, or will all be lost?

I DO NOT OWN ANYTHING BUT THE STORYLINE (As much as I wish I did)!!!!!!!!!!

Author's Note:
Dumbledore, Sirius, Snape, Lupin, and Tonks are alive in this. And the Trials of Apollo do not apply to this story.
I will try to update frequently and reply to any comments, but I do not have a schedule. Constructive criticism is welcome! This is my first fanfic so I apologize in advance for any mistakes I might make. Thank you for even showing the slightest bit of interest in this book!!!!! :)
Update: this book is undergoing major editing. do beware that most of the chapters are not good and as I'm editing I will also be updating chapters that go along with the current storyline.