Well, perhaps Harry starts to isolate himself completely. He stops using magic as it reminds him of the people who betrayed him. He could then stumble upon a long - forgotten magic or a hidden place that holds the key to either his redemption or his downfall. As he delves deeper into this new discovery, he might start to understand the motives behind the betrayal, which could either harden his heart or make him more empathetic.
One possible plot development could be that Harry loses all faith in the wizarding world. He might go into hiding, constantly looking over his shoulder. Another could be that he decides to seek revenge on those who betrayed him, leading to a dark and dangerous path for him. Maybe he also finds an unexpected ally who helps him see that not everyone is against him and gives him the strength to rise above the betrayal.
In this kind of fanfiction, a likely plot development is that Harry is so distraught by the betrayal that he decides to leave the magical world for the Muggle world. There, he tries to start a new life but finds it difficult as his magical nature still haunts him. He may meet other outcasts who have their own stories of betrayal. Together, they could form a sort of support group or they might plot to expose the wrongdoings of those who betrayed Harry in the wizarding world.
After becoming a phoenix, Harry might gain the ability to see things from a different perspective. He could use this to understand the motives behind his betrayal. It could lead to a journey of self - discovery where he not only comes to terms with what happened but also uses his phoenix form to heal the broken relationships in the wizarding world, bringing about a new era of unity.
One possible plot could be that everyone believes false rumors about Harry being a dark wizard. His friends from Hogwarts, including Ron and Hermione, turn their backs on him. Harry then has to find a way to prove his innocence all alone, perhaps by going into hiding and secretly investigating who spread the lies.
Well, in some fanfictions, it could be part of a much larger conspiracy within the Ministry of Magic. There could be a group within the ministry that has gone rogue and they see Harry as a symbol of resistance against their corrupt plans. So, they betray him to silence him and make an example out of him. They might also think that by getting rid of Harry, they can better control the wizarding population who often look up to Harry as a hero.
Perhaps there could be a magical object or spell involved that is causing this forced marriage. Harry and Snape might have to work together to find and break this spell. Along the way, they could learn more about each other's pasts and secrets, which could change their relationship from one of enmity to something more complex.
One possible plot development could be Percy feeling extremely hurt and isolated after the betrayal. He might go off on his own to find a way to prove his worth again. Maybe he'll encounter some old enemies who now see him as vulnerable and try to take advantage of his situation.
Another scenario could be that an impostor, using some form of shape - shifting magic, disguises as a Gryffindor and does things that make it seem like Harry has betrayed the house first. As a result, the real Gryffindors, deceived by this false appearance, turn their backs on Harry.
One possible plotline could be that Ash's friends start believing false rumors about him being a traitor to their group. For example, an enemy might spread lies that Ash is secretly working for a rival organization. So, his friends gradually turn their backs on him, leaving him alone and confused. He then has to prove his innocence while also dealing with the pain of betrayal.
Another development could be Ginny's perspective. She might be conflicted as well. She loves Harry, but not in this forced way. So she could be torn between her feelings for Harry and her own sense of independence. She may start to rebel against the idea too, which could lead to some interesting interactions between her and Harry as they both deal with the situation.
One possible plot development could be that his friends, like Sakura and Sasuke, come to take care of him. Sakura uses her medical skills to try and bring down his fever. Another could be Naruto having fever-induced dreams about his past, like his lonely days as a child. Maybe he even hallucinates about his parents. It could also lead to a situation where the village is in danger, but Naruto is too sick to help at first, creating a sense of tension and urgency among the other characters.
Well, it could be that Kate has some ulterior motives for kidnapping Stiles other than just causing trouble for the pack. Maybe she thinks Stiles has some knowledge about a powerful supernatural artifact or a secret that could help her in her own goals. As the story progresses, Stiles could start to form a strange sort of bond with Kate, not a friendly one but more of an understanding of her twisted mindset, which could add a whole new layer to the plot.