One plot twist could be that Snape discovers Harry is his son right before a major battle. This new knowledge gives him the extra motivation to fight even harder to protect Harry. Another could be that Voldemort finds out about this relationship and tries to use it against them both, perhaps by threatening to harm Harry if Snape doesn't turn on Dumbledore.
Well, in such a fanfiction, a big plot twist might be that the reason Harry has such a strong connection to the Dark Arts (as he can speak Parseltongue) is because of his relation to Snape. Maybe Snape has some long - lost family magic that got passed on to Harry. And then there could be a twist where Harry's real mother was actually someone else, and Lily was just protecting Harry because of Snape's request, which would completely change the backstory we thought we knew.
Often, there's a plot twist where some magical interference or prophecy was involved in hiding the truth. Maybe a powerful wizard or witch cast a spell to make everyone believe Harry was James' son when in fact he was Snape's. And then, as the fanfiction unfolds, there are signs and clues that start to surface. Like, Snape's strange behavior towards Harry throughout the years at Hogwarts might be because he was his father but couldn't show it. It creates a really interesting re - imagining of the relationships in the 'Harry Potter' world.
One possible plot twist could be that Harry struggles with his new identity. He might initially reject the idea but then gradually discover certain dark powers within him that he has to learn to control. This could lead to a conflict with his friends who are unsure whether to trust him.
One plot twist could be that Snape is actually mentoring Harry on behalf of Dumbledore from beyond the grave. Maybe Dumbledore had some secret plan that he didn't get to fully execute, and Snape is now following through with it. Another could be that Snape discovers a new magical ability in Harry that no one else knew about.
One main plot twist could be the revelation of Snape's true relationship to Harry. This would completely change Harry's view of himself and Snape. Another could be how the wizarding world reacts to this news. People who once hated Snape might have to reevaluate their opinions, and those who thought they knew Harry's family history would be shocked.
One possible plot could be that Harry discovers his true identity gradually. At first, he might notice strange similarities between himself and Voldemort, like certain magical abilities that are more in line with the Dark Lord's. Then, as he digs deeper, he has to face the internal conflict of his new identity and decide whether to embrace it or fight against it.
The plot could take a really interesting turn when it comes to Voldemort. Since Snape is raising Harry, he might train Harry in a way that Voldemort doesn't expect. Maybe Harry would be more of a spy in the dark side's camp. Snape could also use his position to mislead Voldemort about Harry's true abilities and intentions. This would create a whole new set of challenges and power dynamics in the fight against the Dark Lord. Harry's loyalties would be constantly tested, and his relationship with Snape would be even more crucial to the story.
One possible plot twist could be that Snape saves Harry in a very public way, which shocks everyone in Hogwarts. Maybe Umbridge was about to use an illegal and extremely harmful spell on Harry during a public 'interrogation' session, and Snape steps in at the last moment, revealing some long - hidden information about Umbridge's true nature that even Dumbledore wasn't fully aware of.
One plot twist could be that Snape discovers a hidden secret about Harry's family that changes his whole perception of them. For example, he might find out that there was a prophecy related to Harry that was different from what everyone thought.
One possible plot twist could be that Snape has a hidden agenda all along. Maybe he's been using Harry as a pawn in a bigger scheme related to the wizarding world's power struggle. Another could be that Harry discovers a long - lost family connection to Snape that changes their dynamic completely.
One common plot twist is that Snape was forced to hide his fatherhood due to some dark magic threat. Another could be that Harry's mother had some sort of pre - arranged deal with Snape that led to Harry's birth.