This takes place after the war, Percy and Annabeth are visiting Sally and Paul.
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"Do we have to go?" Percy asked as he and Annabeth climbed into the back of Sally's car. "Yes, he has a daughter your age, you should get along!" Sally said, leaning over the drivers seat.
One of Sally's books had been published and it was a huge success. So big in fact, that a director wanted to make a movie out of it. The director had scheduled a meeting with an actor he wanted to play the main character, and he wanted Sally to meet him.

Percy and Annabeth grumbled, excepting to meet some rich mortal kid, who would probably judge them the second they arrived. They were wrong.
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The Daughters POV.

I walked outside behind my dad, knowing this was going to be awful. He said the writer had a kid my age, and that he was bringing a friend. Great, I thought. More people to make fun of me.
I saw the car door open, and the kids stepped out. My face broke into a grin. I ran to the kids, and saw their faces drop in shock too.
"Piper? How long has it been, months?" Annabeth hugged me and Percy stood awkwardly to the side. "I'm guessing you three know each other already?" My dad said, surprised.
"Oh yeah, we're Demi-" I stopped Percy. "They go to my camp also, dad."
Percy and Annabeth's eyes widened knowingly. "Well, we'll just be over here." Annabeth said, walking down the hill. I followed her, laughing all the way.