Camp Owl-Blood: An Owl City/Percy Jackson x-over

It's been almost a year since Adam Young's life changed more than it ever had before. Almost a year since he arrived at Camp Half-Blood, almost a year since he found out that he was a Greek god--the son of Athena and Apollo--and almost a year since he met his little sister, Echo Smalley. Everything has gone completely fine so far... But that's about to change as Adam and Echo face their toughest challenge yet--rivalry... between the two of them. Will their perfect brother/sister relationship withstand such a heavy beating? Or will they learn to hate each other because of the heavy competition? **short chapters due to lack of word count on my phone...**