I don't own Percy Jackson, or any other references made or thought have been made.
It was a fine summer day at Camp Half-Blood. New demigods were coming in regularly and the camp reconstruction was finally finished. Percy and Annabeth were still…uncertain of their feelings, along with everyone else. Thalia had returned from the Hunt for the summer, Luke had been reincarnated as a teenager, and Nico was back. Everything seemed fine, until they arrived.
Chiron and Mr. D were playing cards in the Big House. Percy and his friends were all skiing at the beach, with Percy pushing the water to make them move without a boat. Jace (child of Nemesis, idea borrowed from a "leprechaunsarekronos'sservants" story) was battling with Nico in the Training Arena. And everyone else was doing their own things.
Nobody seemed to notice three boys walk over the hill towards camp, but one. They walked right past Peleus, the dragon watching the Golden Fleece, and straight into camp. The camper saw one with a giant sledgehammer, one with an electric guitar, and one with a large Bible. Then the single son of Dionysus, who had been walking towards the Dining Pavilion, saw them walk onto the camp straight for the Big House. Luckily the camper was closer and got their first, breaking down the door.