One possible motive could be to create a really dark and edgy take on the characters. Maybe the writer wants to explore how far the characters could be pushed out of their normal personalities. For example, if Percy was under some kind of dark magic influence, it could lead to such an out - of - character action.
Perhaps the writer is trying to explore a relationship breakdown in a very extreme way. By having Percy slap Annabeth, it could be a starting point to show how their relationship could deteriorate completely. It might also be a way to show the consequences of extreme stress or misunderstandings between them, although it is a very harsh way to do it.
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.
One possible motive could be protection. Annabeth might think that there is a threat to Percy that she can only handle by taking him away from the situation. For example, if there's a prophecy that puts Percy in danger and she believes she can keep him safe in a hidden location.
One possible motive could be miscommunication. In fanfiction, if there's a misunderstanding between them, Percy might lash out and seem like he's bullying Annabeth. For example, if he misinterprets her actions as a betrayal, he could start being mean to her.
I'm not sure. Fanfiction can be a very niche and subjective area. Some people might find such a plot interesting in a 'what - if' scenario exploration within the Percy Jackson fandom, but it also goes against the typical relationship dynamic between Percy and Annabeth. It really depends on individual writers and what they're trying to convey with such a shocking plot device.
The slap could also be a turning point in their relationship. It might make Percy more aware of Annabeth's feelings and boundaries. He could start to be more careful with his actions and words around her. On Annabeth's side, she might feel a bit guilty after the slap and try to make amends in her own way, like by doing something nice for Percy that she knows he'll appreciate.
Well, one reason could be that in the fanfiction, the writer might want to explore a different dynamic. Maybe Annabeth gets lured by Luke's charm that has been newly developed in the fanfic. Luke could be presented as more understanding or having a different kind of allure that attracts Annabeth away from Percy.
She might be a bit shocked at first. But then, being Sally, she'd probably quickly regain her composure and give them a knowing smile. After all, she's seen Percy grow up and she would be happy for him to have such a close relationship with Annabeth.
Another motive could be a difference in ideology. If Percy believes in a different way of handling things compared to Artemis, and he feels that her methods are endangering the world or his loved ones, he might decide to betray her in order to stop her from following her current path.
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.
Percy might be a bit flustered and embarrassed. He's protective of his relationship with Annabeth, so having Magnus walk in might make him feel like their privacy has been invaded. He could quickly try to shield Annabeth or just look really shocked.