In most well - written fanfictions, this would be a very out - of - character plot for Annabeth. She is usually depicted as loyal to Percy. However, in some more 'twisted' or alternate - universe fanfictions, it might be a plot device used for shock value or to explore different relationship dynamics. But it's not a common or expected theme in the main body of fanfiction related to these characters.
The fan community would likely be divided. Some fans would be extremely disappointed and outraged as they have a strong attachment to the Percabeth relationship and see Annabeth as a character of integrity. They might even boycott such a fanfiction.
Well, it's possible that such a fanfiction exists given the creativity of fanfiction authors. They like to experiment with different relationship dynamics. But considering the popularity and the nature of Annabeth and Percy's relationship in the source material, this would be quite a shocker. It could also attract a lot of criticism from fans who are attached to the original relationship, while others might be interested in seeing how such a different plot would unfold.
There might be such fanfiction out there in the vast world of fan - created content. However, this kind of plot goes against the original relationship dynamics in many fans' eyes. It's important to note that fanfiction can cover a wide range of scenarios, some of which may be controversial or not in line with the general perception of the original story.
In most fanfics, this is often just a fictional and sometimes out - of - character plot device. There's no real evidence within the official Percy Jackson canon for such a thing, but in fan - created stories, it could be based on the author's desire to create drama. However, it goes against the core relationship we know from the original books.
There might be such fanfictions out there, but this goes against the original relationship in the Percy Jackson series. Fanfictions like this often explore alternative, and sometimes controversial, storylines. However, I don't recommend seeking out stories that break the core relationships in such a negative way as it can be quite off - putting to many fans of the original work.
I'm not sure specifically about this particular fanfiction. Fanfiction can cover a vast range of scenarios, and while this is a rather unorthodox and not very positive one in the context of the characters, it might exist in some corner of the fanfiction world. You could try searching on popular fanfiction websites.
One common theme could be the breakdown of trust. If Percy cheats, it shatters the trust that Annabeth has in him. Another theme might be the exploration of jealousy and how it can consume a character like Annabeth. Also, it could explore the idea of redemption, whether Percy can make up for his mistake or not.
I don't have statistical data on the prevalence of such fanfiction. But considering the nature of the Percy Jackson fanbase which is often made up of younger readers and those who love the positive themes in the books, this type of fanfiction that involves cheating and potentially inappropriate content is probably not very common. Most fanfiction in this fandom focuses on things like new quests, character growth, or positive interactions between the beloved characters.
In most fanfiction concepts like this, it goes against the established relationships and character traits in the original works. Annabeth and Percy have a strong bond, and such a plot would be a major deviation. It could lead to a lot of negative reactions from fans who are attached to the original relationship.