Perhaps a group of rogue Hogwarts students who have fallen under the influence of dark magic. They want to use Harry for some dark ritual, and Snape becomes an unexpected shield for Harry. Snape has to deal with the internal problem of the school while also protecting Harry from these students.
One idea could be that Harry is on the run from some dark wizards and hides behind Snape in the middle of a chaotic battle in Hogwarts. Snape, initially annoyed, realizes Harry's dire situation and secretly protects him while still maintaining his cold exterior.
Perhaps in this fanfiction, Harry hides behind a mask because he wants to experience life in a different way. He might be tired of all the expectations that come with being Harry Potter. By wearing the mask, he can interact with people without them knowing who he really is, and he could discover new things about the wizarding society and its inhabitants. He could also be using the mask as a form of self - discovery, to find out who he is when he's not 'Harry Potter'.
It could be Voldemort. Even if he was defeated in the original story, in this fanfiction he might have some sort of lingering influence or perhaps a follower who is continuing his dark work. Harry hides behind the mask to avoid being detected by this new threat related to Voldemort.
Well, in 'snape dumps harry fanfiction', it might be about exploring the emotional fallout. Snape has always been a rather tortured and complex character. Dumping Harry in a fanfic could lead to a whole new set of storylines. It could be a way for the writer to show Snape's more assertive side or to create a situation where Harry has to deal with rejection from an unexpected source. Maybe it's also a way to explore how the Hogwarts community would react to such an event, as Snape and Harry are both important figures in the wizarding world.
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.
I'm not entirely sure specifically what that particular 'harry hides abuse fanfiction' is about without reading it. But generally, it might be a fan - created story where the character Harry is somehow involved in hiding abuse. It could be related to abuse within a magical world context, like hiding the abuse of magic by certain characters or perhaps hiding the abuse of other students at Hogwarts if it's related to Harry Potter fanfiction.
One reason could be that in this fanfiction, Snape has some hidden kindness towards Harry that he doesn't show in the original story. Maybe he secretly protects Harry from other threats, which makes Harry feel safe around him.
Another way Snape could comfort Harry is by standing up for him in certain situations. Maybe when other teachers or students are being unfair to Harry, Snape steps in and defends him. This act of protection can be a great source of comfort for Harry, as it shows that someone is on his side even if they have had a rocky relationship in the past.