It's modern day.
You're a demigod who fought and survived the war with Kronos and Gaia.
And not long after you turn 19, Apollo shows up at camp Half-Blood with none other than Percy Jackson.
You heard the story. Everyone at Camp did.
Apollo was no longer a God.
Even though you weren't a huge fan of the Gods yourself, you couldn't help but feel bad. You tried to keep your distance and not get involved but after the whole ... incident at the end of the week you couldn't help yourself anymore.
So, you joined Meg and Apollo on their quest and saw it through to the end.
Now Apollo has his Godhood and immortality back and you can't help but feel a little ... empty. Meg is at Camp Jupiter and Apollo is in Olympus.
You try to keep your mind off the feeling, you train constantly, helping other younger campers. Literally anything.
And of course, that doesn't work either. Your sparring with an Ares kid and end up breaking your arm. It happened too fast to really understand how, though.
Your sitting on the bleachers of the training arena, caressing your fast bruising arm when a familiar voice comes out of nowhere.
"I really can't leave you alone, can I?"