One reason could be Percy's constant danger - attracting monsters and putting Annabeth in harm's way too often. In fanfiction, authors might explore how this constant stress could lead to a breakdown in their relationship.
In fanfiction, they might break up because of outside pressure. For example, if the gods or some powerful force tries to keep them apart for some reason. However, their strong bond and shared memories would eventually lead to their make - up. Their adventures together, like the time they spent in Tartarus, are so significant that they can't stay apart for long.
Their friends would be really worried during the break - up. For example, Grover might try to play the peacemaker. And when they make up, the friends would be relieved. They know how important Percy and Annabeth are to each other and to the group as a whole.
He could also become angry. Percy has a bit of a temper, and he might lash out at Annabeth, demanding an explanation. He might feel betrayed, especially if he doesn't understand the real reasons behind the break - up. In his anger, he could distance himself from their mutual friends and go on solo quests to clear his head.
Well, I've come across some. In many of these fanfictions, the authors explore their relationship further, often adding new adventures or challenges for them as a couple. It's really interesting to see how different writers interpret their connection. For example, some might focus on how they deal with their relationship in the context of the demigod world, like facing new monsters together while also being in love.
It's hard to say for sure if it's extremely popular. It might be a niche concept within the Percy Jackson fandom. Some fans might be interested in exploring such unique and somewhat edgy scenarios between the two characters, while others might find it a bit too out - of - the - ordinary and not as appealing.
It could be a new demigod who has a grudge against Percy and somehow convinces Annabeth that Percy is a threat, leading to her tying him up. So this new demigod would be the antagonist.
One possibility could be that it's part of a prank gone wrong. Maybe Annabeth was trying to play a practical joke on Percy and tied him up, but then things start to spiral as they face some unexpected danger while he's tied. And they have to figure out how to get Percy free and deal with the situation together.
Perhaps Percy realizes that their relationship has become too codependent. He might feel like he's losing his own identity within the relationship. He could also break up with Annabeth if he discovers some long - hidden secrets about her past that he can't come to terms with, like if there were things she did in the past for survival during a quest that go against his moral code.
One common theme is adventure. Since Percy and Annabeth are from a world full of mythological adventures, the fanfictions often continue this trend. For example, they might go on a new quest together.