It could be an accident. Percy might have been aiming for something else, like a trash can to show off his throwing skills, and his aim went wrong and the apple ended up flying towards Annabeth. This could then lead to an awkward but also interesting situation in the fanfiction.
Perhaps it was a dare. In the world of fanfiction, the characters can be put in all sorts of silly situations. His friends might have dared him to throw the apple at Annabeth just to see what would happen, not thinking about the possible consequences.
He could be frustrated with her. Maybe they had an argument earlier, and Percy, not knowing how else to express his feelings, throws the apple as a way of getting a reaction from her. It's like a childish way of saying 'I'm mad at you' without using words.
Another reason could be that Percy wants to start a conversation about Annabeth. By showing off the fanfiction, he can get people talking about her character, her strengths, and her role in their world. This could lead to more in - depth discussions about her and also about the whole story universe they are in.
One reason could be to add a new twist to the story. By making Percy smarter, it changes the power dynamic between them and creates new plot possibilities.
Another possibility is that there could be external forces at play. In some fanfic storylines, there might be a prophecy or a powerful enemy that convinces Annabeth that leaving Percy is the only way to protect him. She might sacrifice their relationship for his safety, believing that her presence endangers him in some way.
She might be interested because she cares deeply about Percy. Reading about his experiences in the Styx, even in fanfiction, could be a way for her to understand him better on a different level.
It could be because he wants to give her a special gift without her knowing. So he sneaks in to leave it on her bedside table.
They might decide to sneak out just to have some alone time away from the chaos of their normal lives. In their world, there's always so much going on with training, quests, and dealing with other demigods, so they could be craving some peace and quiet together.
Well, it could be because Sally is an important person in Percy's life. He trusts her and wants to share the interesting things about Annabeth from the fanfiction with her.
He might do it out of pure affection. Percy really cares about Annabeth, and playing with her hair could be an instinctive way to show his love.
Another consequence might be that it starts a comical chain of events. Maybe the apple misses Annabeth and hits someone else instead, like Grover, and then there's a whole lot of chaos and laughter that follows. The fanfiction could then take on a light - hearted, humorous tone from there.
Well, in some fanfictions, Percy might be mad at Annabeth because of a misunderstanding. Maybe she made a decision without consulting him in a crucial situation regarding their adventures. For example, if she chose a path that put their friends in danger without his input, Percy could get angry.