It could lead to a stronger bond among the seven. They would become more united in protecting each other.
Percy's character development might take a new turn. He could become more withdrawn at first as he deals with the new situation of his friends knowing, but then grow stronger with their support. This might also change his relationship with the gods. He may be more hesitant to trust them, or he could demand more protection for demigods in general from them.
The story could shift its focus to Percy's healing process. There could be new sub - plots where the seven go after the source of the abuse, or they have to deal with the emotional fallout within the group as they all process Percy's situation. It might also introduce new characters who are related to the abuse situation, either as allies or enemies.
The abuser could face immediate death. Gods like Hades might be quick to drag the abuser down to the Underworld for punishment.
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 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.
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 abuser might find themselves ostracized by the whole demigod community. Word would spread about what they did, and no one would want to be associated with them. Also, they could be targeted by other protective figures in Percy's life, not just Poseidon. The gods and goddesses who have some connection to Percy or just have a sense of justice would make sure the abuser pays for their actions. They could be cursed to have a series of misfortunes befall them, like always being in the wrong place at the wrong time and facing various dangerous situations.
The abusers might be ostracized by the community. Once Triton finds out and spreads the word, other sea - creatures or characters in the story might shun them. This could lead to them being isolated and having a hard time getting help or resources.
Well, one possible plot development could be that the Seven initially don't believe it. They might think Percy is joking or just going through a rough patch. But as they start to notice his withdrawn behavior, his lack of care for his own safety during quests, they realize the seriousness. Then they would probably try to surround him with love and support, and maybe even seek help from the gods, like asking Aphrodite to restore his love for life or Apollo to heal his mental state.
Percy could become more withdrawn at first. The revelation of his abuse might make him more self - conscious and less trusting.
They might be shocked at first. They probably didn't expect Percy, who is usually so strong and brave, to be dealing with depression.
They could get in trouble with school authorities. Maybe they'd be sent to the principal's office, get detention, or face some form of disciplinary action like being banned from certain school events.