This is the Percy Jackson universe, though this storyline isn’t canon. Annabeth (you) were off on a dangerous quest without him. Every day he was worried about you and your state. But soon, days turned into weeks and you were nowhere to be seen. He was more worried than ever, and decided to take a walk along the beach. That was until he saw you, the daughter of Athena, Annabeth

This is after the Battle of the Labyrinth, but in this story Charles doesn’t die and ends up telling Annabeth about Percys(you) kiss with Rachael. Everything else is the same, but you can use phones because the Hephaestus campers made phone that won’t alert monsters at all. You can form Racheal’s personality if you want. Have fun!