Some fans might be intrigued. They could see it as an interesting exploration of 'what if' scenarios, even if it goes against the grain of the original story. However, a large number of die - hard fans would probably be quite upset as it goes against the strong bond that was built up between the two characters throughout the books.
Percy Jackson fans have a wide range of reactions. There are those who are very protective of the original story and characters, and for them, a fanfic where Annabeth cheats on Percy is almost sacrilegious. They might avoid it altogether or even be vocal about their dislike. On the other hand, some more open - minded fans might view it as a creative take, though still with some reservation. It really depends on how attached the fan is to the canonical relationship between Percy and Annabeth.
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.
Percy would feel a deep sense of guilt as well. He might think that he should have been there to protect her. So, he would be determined not only to free her but also to make sure whoever is responsible pays for what they've done. He would use his powers over water to his advantage, like creating distractions or using water to weaken the enemy's defenses while he tries to reach Annabeth.
There might be some fanfiction out there with such a plot, but it goes against the essence of their relationship in the original series. In the official Percy Jackson books, their relationship is based on trust and mutual respect.
Percy would be completely devastated. He might go into a state of shock at first, unable to believe that Annabeth is really gone. Then he could become filled with rage, vowing to take revenge on whoever or whatever was responsible for her death.
On the other hand, she could try to honor Percy's sacrifice. Annabeth might focus on the reasons why Percy died for her and strive to fulfill any tasks or goals that he might have hoped she would achieve. She would carry on his legacy in a positive way, even though she is heartbroken.
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.
Annabeth would be devastated. She and Percy have a deep connection. She might go into a state of shock at first, then be filled with a fierce determination to find out who was responsible and make them pay. She would probably also be racked with guilt, thinking she could have done something to prevent it.
Well, that could lead to a major shift in the story. Percy might be heartbroken and struggle to cope without her.
Percy could be furious. He has always been loyal to Annabeth, and this betrayal would be a huge blow. He might immediately cut off all contact with her and go off on his own for a while to cool down.
Fans like it because they love the relationship between Percy and Annabeth. Their visits in fanfiction give fans more of that dynamic to enjoy.