One interesting plot could be Harry's struggle to accept Severus as his father. He has such a long - held image of Severus as an enemy, and now he has to come to terms with this new reality. Another plot could be Severus trying to make up for lost time and be a good father to Harry. There might also be a plot where the wizarding world reacts to this news. Some might be shocked, others might not believe it at all.
If Harry finds out Severus is his father in fan fiction, it could completely change the dynamic between them. Harry's view of Severus would shift from hatred or suspicion to a complex mix of emotions. He might start to understand Severus' actions in a new light, like his seeming animosity towards Harry in the original story could be reinterpreted as a father's tough love. This revelation could also change Harry's relationship with the other characters. For example, his connection to the Snape family, if there are any in the fan - made lore, would become significant. It could also impact how he views his mother, Lily, and her relationship with Severus.
One interesting plot development could be how Harry's relationship with the wizarding world changes. Knowing Sirius is his father might make him feel more confident and entitled to certain things. He might demand more answers from Dumbledore about his family's past and the secrets that were kept from him. Another aspect could be his relationship with the Weasleys. It might become a bit strained as he realizes his true lineage and starts to see himself in a different light, perhaps more of a pure - blood heir in his own mind, which could contrast with the Weasleys' more humble status.
The relationship may become more complicated. Severus might struggle with his own emotions. He might feel an urge to protect Harry from this fictional abuse, but at the same time, he has to deal with his long - standing animosity towards Harry. So, it could lead to a very strange and tense dynamic between them, with Severus trying to balance his new - found protectiveness and his old grudges.
Harry's character grows in terms of self - confidence. Knowing that Sirius is his father gives him a stronger sense of identity. He no longer feels like an orphan in the truest sense. He becomes more assertive in the wizarding world, demanding respect and answers. For example, he might be more forceful in his interactions with Snape, not tolerating any slights as he now has a powerful family connection.
Severus might be initially shocked. He could feel a strange sense of protectiveness over Harry, despite their past differences. He might try to find out who wrote the fan fiction and why they depicted such a disturbing scenario.
Another plot development could be the reaction of the wizarding community. When they find out that Harry and Voldemort are mates, there would be chaos. Some might think that Harry has been turned to the dark side. His friends, like Hermione and Ron, would be deeply confused and might even feel betrayed at first. They would have to decide whether to trust Harry's judgment or oppose him, which could lead to a great rift in their friendship.
One possible plot could be that the twin has been hidden away by some dark force all this time. When Harry discovers the twin, they have to figure out how to break the spell or curse that was placed on the twin. Another plot might be that the twin has been living in the Muggle world, unaware of their magical heritage, and Harry has to introduce them to the wizarding world and they face various challenges together.
Often, there are plots centered around secrecy. Harry might worry about how others will react, like his friends Hermione and Ron. So, he tries to keep his relationship with his mates a secret. And then there's the plot of the mates themselves getting to know each other better. Since they are all in a relationship with Harry, they need to form their own bonds too, which can lead to some really interesting interactions and storylines.
Maybe a magical accident or a powerful spell that revealed the truth.
It could be the pressure of being 'The Chosen One'. Harry has so much expected of him, and the constant fear of failing in his fight against Voldemort might be overwhelming.