Another plot point might be the discovery of a shared secret or goal between Snape and Harry. This could bring them closer together and change the dynamic of their relationship. For example, they might both be trying to uncover a mystery in the wizarding world that requires their combined efforts.
A significant plot point could also be the development of a new friendship or mentorship between Snape and Harry. As Snape stops hating Harry, he could start teaching Harry new spells or sharing his knowledge of the dark arts in a more positive way, which would be a major shift from their previous relationship.
One key plot point could be the moment when Snape first shows a sign of not hating Harry. Maybe it's during a dangerous situation where Snape protects Harry instead of being cold towards him.
The plot might start with Snape realizing that Harry is in need of a proper family. So he decides to adopt him. As the story progresses, they would need to adjust to living together. Snape would have to change his living quarters to accommodate Harry. There could be a lot of emotional moments like when Snape tells Harry stories about his mother. Also, the fanfic could explore how Snape helps Harry deal with his fame in a different way than the Dursleys did. He could teach Harry to be more humble and use his fame for good in the wizarding community.
One key plot point could be the revelation that Snape is in some sort of danger that only Harry's sacrifice can prevent. Maybe it's a curse placed on Snape by Voldemort that can only be broken if Harry gives his life. Another point could be Harry's decision - making process. He would have to grapple with leaving his loved ones behind. And finally, the moment of sacrifice itself, which could be a very emotional and magical scene.
In a 'harry saves everyone fanfic', one key plot point could be Harry discovering a new, hidden power within himself. This power might be the key to saving everyone. He could also form new alliances with unlikely characters. For example, he might team up with some Slytherins who have a change of heart. Another aspect could be that the situation is extremely dire, like the whole wizarding world is on the verge of destruction. Harry then has to go on a quest to find ancient magic or artifacts that can turn the tide and save all the wizards and witches from harm.
In some versions of 'harry becomes an obscurus fanfic', the key plot could be Harry's journey to master the Obscurus power. He might start out as an outcast because of it, but then discovers that it can be a weapon against the real threats in the wizarding world. His relationship with Dumbledore or other authority figures might change as they try to help or restrain him. And there could be a big showdown where he has to decide whether to fully embrace or reject the Obscurus within.
One common plot point is the initial resistance from both sides. Snape, with his pride and past grievances against Harry's father, would be hesitant. Harry, on the other hand, would be confused by the whole idea. Another is the discovery of new sides of each other. As they spend time together, they start to see qualities in one another that they never noticed before. And there's often the external opposition from the wizarding community who might not accept such an unusual pairing.
One possible reason could be that in the fanfic, Snape realizes Harry has more of Lily in him than he initially thought. Harry might show kindness or a particular trait that reminds Snape of Lily, softening his feelings.
In some fanfiction, the Occlumency lessons lead to a mental connection between Harry and Snape. This connection allows them to share emotions and thoughts in a way they never expected. For instance, Snape might experience Harry's fear of losing his friends, and Harry might understand Snape's love for his mother on a deeper level. This connection forces them to reevaluate their relationship and work together more closely against the common enemy, Voldemort.
One possible plot point could be Snape spanking Harry as a form of punishment for Harry's misbehavior in potions class. Maybe Harry was being reckless with ingredients and Snape, in his strict way, decides on this extreme form of discipline.
One possible plot could be that they discover they are brothers early on in Harry's time at Hogwarts. Snape then has to balance his duties as a teacher and his newfound family connection. He tries to protect Harry in secret from the threats within the school, like Malfoy and his cronies.
Perhaps in the fanfic, there is some sort of magic that binds their fates together. Snape might discover this connection and, despite their past differences and his own reserved nature, he decides to propose to Harry as a way to accept this newfound bond. It could also involve Snape trying to make amends for his past actions towards Harry by offering this ultimate commitment.