Ok, so this might sound weird, but I had this idea that Percy was adopted by the Dursleys. But that's not all! When he is adopted he's a year older than Harry. Harry is eleven and Percy is adopted during the school year. You know what this means? Harry's not aware that Percy exists, because Percy's not a wizard. Please read, I know it sounds weird, but maybe give it a chance?

When Percy goes into Police custody, SHIELD does a background sweep on him. Realizing that he could be a dangerous terrorist, Fury has two shield agents bring him in. When Fury can't get anything out of him, he is given to Stark and the rest of the Avengers to keep an eye on him. Their task: Find out who this kid really is. ALL RIGHTS RESERVED TO RICK TROLL RIORDAN AND MARVEL Oh and this beautiful cover doesn't belong to me.