One possible plot development is that the gods gather to hold a trial for the abuser. They would bring in witnesses, and Percy would have to testify about what happened to him. This would be a very emotional and intense scene.
Another development could be that the gods decide to give Percy special powers or abilities to help him defend himself in the future. Maybe they send him on a quest related to his abuse, like finding a magical object that can erase the memories of the trauma or a weapon that can protect him from any future harm.
There could also be a plot where Percy starts to doubt the gods' intentions even after they find out about his abuse. He might think they are only acting out of guilt or to save face. This could lead to a conflict between Percy and the gods, with Percy trying to distance himself from them while they are trying to make amends. And in the process, Percy might find new allies among the demigods who have also had similar experiences.
There could be a plot development where the Weasleys' discovery of Harry's abuse leads to a rift in the wizarding community. Some might not believe Harry was abused or might try to cover it up. The Weasleys would then have to fight against this disbelief and secrecy. They could also form alliances with other families or characters who believe Harry. In the meantime, Harry might start to develop new magical abilities as a result of the love and support he gets from the Weasleys. This could be a turning point in his growth as a wizard, as he learns to use his magic in a more positive and confident way.
One possible plot development could be Nico seeking justice for Percy. He might start to investigate the abuse on his own and gather evidence against the abuser.
Perhaps there could be a plot where Annabeth discovers that the abuse has given Percy some hidden powers or a different perspective on his demigod abilities. So she encourages him to explore and master these new aspects of himself. Or, it could be that the news of Percy's abuse spreads among their friends, and they all come together to form a support system for him, which in turn strengthens their group as a whole.
It could have a negative impact. It might make some fans uncomfortable or even trigger those who have had similar experiences. It could also change the way people view the characters in a way that may not be in line with the original intended portrayal.
The plot could start with the gods accidentally finding out about Percy's abuse. This discovery could rock the divine realm. Poseidon, as Percy's father, would be enraged and might want to take immediate action. But the other gods would try to calm him down and approach the situation more rationally. Meanwhile, Percy might be in a state of shock at first, but then he would gradually start to trust the gods' intentions to help him. They could offer him a safe place in Olympus while they figure out how to make things right for him in the mortal world.
One possible plot development could be that Draco tries to expose the abuser. He might gather evidence secretly and present it to the right authorities at Hogwarts.
Perhaps there's a power struggle in the story world. Percy might be seen as a threat to certain groups or individuals who then resort to abuse as a means to gain control over him. Another reason could be related to his family background. If his family has some sort of enemies, they might take out their anger on Percy.
The gods might be outraged. They could see Percy as one of their own, especially since he has done so much for them. They might immediately seek to punish the abuser. For example, Zeus could send a bolt of lightning towards the person who abused Percy.
One possible plot development could be that they try to hide Sirius from his family. Another is that they report the abuse to the authorities at Hogwarts.
Well, in many such fanfics, the gods might react with anger. They could seek revenge on the abuser. For example, Zeus might send a bolt of lightning to strike the place where the abuse took place as a sign of his wrath.