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.
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.
Well, the gods are a diverse bunch. Apollo might use his healing powers to try and ease Percy's physical and mental pain. Artemis and her hunters could offer Percy a place among them where he would feel safe. Percy, on his part, would be in a very vulnerable state. He might be hesitant to trust anyone at first, even the gods. His friends from Camp Half - Blood would be rallying around him, providing him with love and support. They would encourage him to speak out about his experience and not let the abuser get away with it.
The abuser could face immediate death. Gods like Hades might be quick to drag the abuser down to the Underworld for punishment.
They might be shocked at first. They could feel a sense of guilt for not noticing earlier. Maybe they immediately try to comfort Percy and offer their support, like giving him a safe place to stay and assuring him that he's not alone anymore.
The reaction of the gods would be diverse. The muses might be intrigued and want to inspire Percy further. Dionysus, the god of wine and celebration, might see Percy's singing as a great addition to his wild parties. However, some of the more serious and war - like gods, such as Ares, might scoff at it, thinking it's a useless skill for a demigod. But overall, Percy's singing would definitely stir up a lot of different emotions and reactions among the gods in the fanfiction world.
They might react with shock, as they may not have fully realized the extent of the danger Percy has faced. Some gods could be impressed by his survival and show newfound respect.
The others in the seven, like Jason, would probably feel a sense of guilt for not noticing earlier. They would come together as a group to support Percy. Jason might offer his friendship and strength to Percy, telling him he doesn't have to face it alone anymore. They would also likely start to investigate who was responsible for the abuse.
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 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.
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.