Maybe he likes it because he has a deep connection with Annabeth in the original story and the fanfic allows him to see different interpretations of their relationship.
It can be considered normal. People often get interested in fanfiction for various reasons. In this case, Percy's brother might like Annabeth fanfiction because he admires her character traits in the original story. The fanfiction could offer new perspectives on her, or it might be that he simply enjoys the writing style of the particular fanfictions he reads.
It could mean that Percy, as a character or a person named Percy, has an interest in the fictional stories created by fans about Annabeth. Maybe he enjoys the different interpretations of Annabeth's character, relationships, or adventures in these fan - made stories.
It could bring them closer. Percy might find it endearing that Annabeth likes fanfiction about them, and it could lead to more open conversations between them about how they are perceived by fans.
Annabeth is known for her intelligence and strategic thinking. She is a strong and independent character. Percy, on the other hand, is brave and has a strong connection to the water due to his father being Poseidon. In the fanfic, when Annabeth sits in Percy's lap, it might be a way to show their unique relationship which has developed over the course of their many shared experiences in the Percy Jackson universe.
One possibility is that it reveals her creative side. Fanfiction can be very creative, and by liking it, she may be drawn to the unique ideas and storylines that fans come up with. It could also suggest that she's a bit of a fangirl herself, not just in the context of the original story but also in the world of fan - created content about her and Percy.
One reason could be that he enjoys the creativity of the fanfiction writers. They might come up with interesting storylines involving Annabeth that he finds really engaging. For example, they could create new adventures for her or explore her relationships in more depth. Also, if he likes the world of Percy and Annabeth, the fanfiction gives him more of that world to explore. He can immerse himself in different scenarios with Annabeth as the central figure, which is exciting for him.
In Percy Jackson and Annabeth fanfics, the relationship between them can be developed in various ways. Some might show their daily life at Camp Half - Blood in more detail, with little arguments and sweet reconciliations. Others could take them on a quest that's not in the official series, adding new monsters and challenges for them to overcome.
In many fanfic stories, Percy and Annabeth often face various enemies. Some common ones might be new monsters created by the author, or perhaps other demigods who have turned to the dark side. These enemies add drama and action to the stories.
There are indeed such fanfics. Fan writers often love to explore the romantic aspects of the relationship between Percy and Annabeth. These fanfics can range from sweet and fluffy stories about Percy's growing attraction to Annabeth, to more complex tales that involve the challenges they face in their relationship within the context of the Percy Jackson universe.