One reason could be guilt. In the original story, Snape had some complex feelings towards Harry's father. By protecting Harry in fanfiction, he might be trying to make up for the past. It's like he's trying to right the wrongs that were done to Harry间接 because of his relationship with James Potter.
One reason could be that the writer wants to create a new plot twist. Maybe Snape's character has fulfilled its purpose in the fanfiction's storyline and his quitting can lead to new developments for other characters.
There could be an excess of alternate universes. Fanfictions often create all kinds of wild AUs for Snape. Maybe he's tired of being in so many different scenarios that don't really stay true to his essence. For example, some AUs make him a modern - day rock star or something completely out of character.
One interesting plot could be that Snape secretly follows Harry during a dangerous wizarding tournament task and intervenes when a dark creature is about to attack Harry without revealing his identity. This would add a layer of mystery and show Snape's hidden care for Harry.
One reason could be that he realizes Harry has a lot of potential and wants to nurture it. He sees that Harry is in a difficult position, being the target of Voldemort, and decides to help him despite their past differences.
One reason could be redemption. Harry realizes that Snape has had a very difficult life and has been on the right side all along, despite his harsh exterior. Harry, being the kind - hearted person he is, would want to save Snape to give him a chance at a better life after all the sacrifices he has made for the wizarding world. For example, Snape's love for Harry's mother Lily was so strong that he dedicated his life to protecting Harry, so Harry might feel a sense of indebtedness.
Isolation. Snape is a lonely character. He doesn't have many friends, and he is constantly in a difficult position between the Death Eaters and the Order of the Phoenix. His feeling of being alone and not being fully understood by anyone can lead to crying in fanfiction.
One possible reason could be that fanfiction often takes creative liberties that may distort the complex character of Snape that J.K. Rowling created. Snape has a very intricate backstory and personality in the original series, and fanfiction might simplify or misinterpret it.
Another reason is that Harry might see the bigger picture. He knows that the three of them are a team and that internal strife can be dangerous, especially in the magical world they live in. By protecting Hermione from Ron, he's trying to keep their group intact. He might think that if Ron's negative behavior towards Hermione is left unchecked, it could lead to the breakdown of their friendship and their ability to face challenges together.
One reason could be to add a shock factor. It completely changes the expected family relations in the original story. Another reason might be to explore Snape's character more deeply. If Harry is his son, it gives a new perspective on Snape's actions and emotions towards Harry throughout the series.
Perhaps he likes to see how fans re - imagine his character. He might be curious about how others view his actions and motives throughout the story.