Harry's First Year Along With Percy

This is a book/fanfiction where Percy, Nico, Thalia, Annabeth; Jason go to Hogwarts in Harry's first year. They are 15-17 years old and the Heroes of Olympus series has already happened. It is two weeks after the war and Chiron gets a request from Dumledore to send a few people to protect Harry Potter from the evil Voldemort.(There is another version of this written) Rated T safe.