In the fanfiction, Percy could be there to check on Nico. Since Nico has had a tough time, Percy might want to make sure he's doing okay at school. He could offer to help Nico with any problems he's having, like dealing with bullies or difficult classes.
It could be that Percy has some important information regarding Nico's heritage or powers that he needs to share in person. School is a relatively safe place where they can talk privately.
One sunny day at school, Percy decided it was time to surprise Nico. He knew Nico was always a bit lonely during lunch break. So, Percy, with the help of some of his other friends, arranged a little 'Underworld' corner in an empty classroom. He filled it with black roses and little skull-shaped candies. When Nico walked in, he was completely taken aback. Percy grinned and said, 'Thought you could use a bit of home here at school.' They spent the rest of the break reminiscing about their adventures in the Underworld and above.
Well, they might have a sweet reunion. Percy could surprise Annabeth during her break, and they'd share stories of their recent adventures. Maybe Percy brings her a small gift related to their Greek mythology world, like a little replica of Athena's owl.
Maybe they'll have a sweet reunion. Percy could show Annabeth around his school, introducing her to his friends. They might also find a quiet corner to talk about their latest adventures.
The camp leaders might betray them. If there is a power struggle within the camp, and Percy and Nico are seen as threats to the current leadership's power, the leaders could set them up. They could make it look like Percy and Nico are breaking camp rules or endangering the other campers, which would lead to the rest of the camp turning against them.
Well, he might get lost in the big school building at first. You know, Percy isn't always the best with directions. Then he could meet Annabeth's friends who are super curious about him. Maybe they'd ask him all kinds of questions about his adventures. And he and Annabeth could end up having lunch together in the school cafeteria, sharing stories and having a great time.
Annabeth's reaction could vary. If she's been missing Percy a great deal, she'll be overjoyed. She might show him around the school, proud to introduce him to her friends or teachers (if possible in the context of the fanfiction). However, if she's in the middle of something important like a test or a big project, she could be a bit annoyed at first but still be happy to see him deep down.
Percy might surprise Nico by organizing a secret treasure hunt around the school. He could leave clues related to their shared memories and experiences. Each clue would lead Nico closer to a final 'prize' which could be a new sword that Percy had crafted especially for Nico. Also, Percy could ask the school cafeteria to serve Nico's favorite Italian food one day. He could then lead Nico to a special table decorated with candles and pictures from their past adventures, making it a very personal and unexpected surprise.
Well, clearly Percy and Nico are the main characters. Percy, the son of Poseidon, is often depicted as brave, a bit of a troublemaker but with a good heart. Nico, the son of Hades, is usually more brooding and has his own set of dark powers. In high school fanfiction, they are the focus, and their interactions with each other, whether it's friendly, rivalrous or something in between, drive the story forward.