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If someone asked Percy who his first friend was, he would say Grover.
If they asked him who came after Grover... he'd say Luke.
The younger campers, campers who were still curious to learn what the bigshot heroes were rambling about at a given moment, would open their mouths in protest, or just stare.
They didn't understand, and in a way, neither did anyone else.
Annabeth was rescued by Luke and Thalia when she was seven years old, the love she had for Luke was deep and strong, and the pain she felt at his betrayal and death was that times ten.
But her feelings were so different from Percy's, she loved Luke like family, meanwhile Percy...
Even she couldn't understand what Percy felt.
The sweet, smart, funny head counselor of the Hermes cabin, who showed Percy around and made him feel welcome in a community for the first time in his life.
The first person to teach Percy how to fight was Luke. Sure Percy picked it up quickly with help from his divine side, but Luke was the one to hammer in the basics, to teach him his first real moves.
The greatest demigod since Hercules, the savior of Olympus...
Once upon a time Percy was just a kid.
And Luke Castellan was his friend.