One possible plotline could be that Percy and Nico are betrayed by a close friend within the demigod community. Maybe they are framed for a crime they didn't commit, like stealing a powerful artifact from the gods. This could lead to them being hunted by other demigods while they try to clear their names.
Another plot could be that they are betrayed in a more emotional sense. Let's say a new demigod joins their group and seems friendly at first. But this new demigod starts to spread rumors about Percy and Nico, turning some of their friends against them. This makes them feel isolated and they have to work hard to regain the trust of their comrades.
One possible plotline could be that Percy, Thalia and Nico are betrayed by their closest friends within the demigod community. Maybe they are framed for a crime they didn't commit, like stealing a powerful artifact. This could lead to them being hunted by their own kind. They would then have to go on the run, trying to clear their names while also facing various monsters that are after them because of the false accusations.
Well, perhaps in the fanfiction, Annabeth betrays Percy's trust in a relationship way. She could start seeing someone else and use Percy's secrets against him to make herself look better in front of the new person. Or she might side with a group that Percy is against, believing their lies and false promises over Percy's warnings. This could lead to Percy feeling completely alone and having to find new allies.
A plotline could involve some sort of magical or supernatural influence that makes Percy and Nico's feelings for each other more intense. They might be under a spell that heightens their emotions, and this leads to them making out. Then, they have to figure out if their feelings are real or just a result of the magic while also dealing with the reactions of their friends and the wider demigod community.
The camp leaders might betray them. If there is a power struggle within the camp, and Percy and Nico are seen as threats to the current leadership's power, the leaders could set them up. They could make it look like Percy and Nico are breaking camp rules or endangering the other campers, which would lead to the rest of the camp turning against them.
Well, it could start with Percy being framed for a crime he didn't commit by the gods. This false accusation makes him feel extremely betrayed. He then has to go on the run while trying to prove his innocence. Along the way, he meets other outcasts and together they form a resistance against the gods. They might try to find a way to hold the gods accountable for their actions and create a new order where demigods are treated more fairly.
One possible plotline could be that Percy discovers his so - called friends have been secretly working against him all along. Maybe they spread false rumors about him, which makes everyone in his world turn against him. He then has to go on a journey alone to clear his name.
Perhaps in the fanfiction, Percy is influenced by some dark magic or a curse that makes him betray the son of chaos. The son of chaos then has to decide whether to forgive Percy or seek revenge. The story could also explore how their friends and allies are affected by this betrayal and whether they side with Percy or the son of chaos.
Well, the fanfiction might show Percy being betrayed in a very personal way. For example, a god he trusted deeply, like Poseidon, could turn against him for some political reason among the gods. Percy would then be heartbroken and angry. He might embark on a journey to find a new purpose, away from the world of the gods. Along the way, he could meet new characters who help him see the true nature of the gods and himself.
One possible plotline is that they have to face a new and powerful enemy that neither of them can defeat alone. So they have to combine their powers and skills. For instance, Percy's water - based powers, Jason's control over the wind and lightning, and Nico's ability to manipulate the shadows could be used in unison to defeat a giant or a powerful sorcerer.
In this fanfic, it could be that Percy and Jason are under the influence of a magical spell or a powerful charm. This influence makes them act against their normal moral compasses and betray their friends. The story could then focus on how their friends try to break the spell and bring them back to their side, while also dealing with the consequences of their betrayal.