One reason could be Percy feeling overwhelmed by the challenges he faces. He often has to deal with dangerous quests and the weight of the world on his shoulders. When Annabeth sees him cry, it might be because he's finally letting out the stress and fear that he's been holding in. For example, in some fanfictions, after a particularly difficult battle where he loses a friend, Percy breaks down in front of Annabeth.
Annabeth could also try to solve the problem that's making Percy cry. If it's related to a quest or a danger, she'll start thinking of ways to fix it. In some fanfictions, she might say 'Don't worry, we'll figure this out together.' and then start making a plan.
She might be initially shocked. After all, seeing someone's abs unexpectedly can be a bit of a surprise.
One possible reason could be a misunderstanding. Maybe Percy said or did something that Annabeth misinterpreted. For example, he might have made a joke that she took the wrong way, thinking he was being disrespectful to her or her beliefs. Another reason could be that Annabeth is under some kind of magical influence that makes her act out of character and lash out at Percy.
One reason could be a misinterpretation of their characters. Maybe in the fanfiction, the writer wants to create a more complex or different dynamic between them. Another reason might be for the sake of drama. By having Percy bullied by Annabeth, it can create conflict and drive the plot forward in a new and unexpected way.
Well, one possible reason could be that Percy made a really stupid decision without consulting Annabeth first. Like, if he went off on a dangerous mission on his own when they were supposed to be a team. Annabeth is a very strategic person and she might feel betrayed or extremely frustrated by such actions.
It could also be due to some sort of magic or mind - control. A powerful enemy might have cast a spell on Annabeth, forcing her to turn against Percy. In this case, it's not really her own will but the result of external manipulation.
Well, it could be due to a misunderstanding. Maybe Percy thought Annabeth did something wrong regarding a quest, like made a decision without consulting him. In fanfics, authors often play with such relationship dynamics.
One possible plot could be extreme embarrassment for both. Percy might quickly turn away and then there could be a lot of awkwardness between them for a while. They would probably have to have a conversation about boundaries and respect.
One possible reason could be a misunderstanding. Maybe Percy made a decision without consulting Annabeth, thinking it was for the best, but she felt left out. For example, if he agreed to a dangerous mission without her input. Another reason might be jealousy. If Percy got a lot of attention from someone else, Annabeth could feel insecure.
One possible reason could be miscommunication. Maybe Annabeth said something without realizing how it would come across to Percy. For example, if she was stressed about a quest and snapped at him when he was just trying to be helpful.