Another reason could be psychological. Harry has lost his parents and Snape's cold and often menacing demeanor reminds him of the danger and loss he has faced. This makes him flinch as a sort of self - protection mechanism. In fanfictions, this psychological aspect can be explored in great detail, showing how Harry's past traumas influence his present reactions to Snape.
In some fanfictions, Harry might avoid Snape because of the pre - existing animosity between them in the original story. Harry has long seen Snape as a figure of authority who is out to get him, so in fan - created scenarios, that fear or dislike could be intensified, leading him to avoid Snape.
One reason is the complex relationship between Snape and Harry in the original Harry Potter series. Writers are intrigued by this relationship and use the idea of Snape pinning something on Harry as a way to explore it further. It could be a symbol of protection, a sign of a hidden connection, or a device for plot development.
The popularity comes from the fact that fans are always interested in character development. Harry and Snape are two very complex characters. In therapy fanfictions, we can see them dealing with their inner demons, past traumas, and learning to coexist or even become friends. It gives a sense of hope and redemption that many fans enjoy. For example, seeing Snape get a chance to heal from his past mistakes and Harry to understand Snape's motives better is really appealing.
In these fanfictions, Snape might ignore Harry because of his past with Harry's father. James Potter bullied Snape when they were at school, so Snape could be projecting that hatred onto Harry. It's a simple yet powerful motivation for his behavior.
Perhaps it's out of his sense of duty. He may feel that as a teacher or an elder in the wizarding world, he has a responsibility to protect Harry, regardless of his personal feelings towards him.
Perhaps it's related to Harry's association with his father, James Potter. Snape had a long - standing grudge against James, and seeing Harry might bring back those bitter memories. So, whenever Harry does something that reminds Snape of James, like being overly confident or a bit of a troublemaker, he yells at him.
In some fanfics, Snape might hurt Harry out of his long - held grudges. Snape was in love with Harry's mother, Lily, and Harry being a reminder of James, who bullied Snape in school, could trigger his negative emotions. Also, Snape's loyalty to Voldemort in the earlier days in some fan - created scenarios might lead him to target Harry, who was seen as a threat to Voldemort's plans.
Well, it's also about the potential for redemption and growth. Snape was a very complex character in the original series. In these fanfictions, raising Harry gives him a chance to show a different side of himself, a more caring and protective side. And for Harry, growing up with Snape would have a huge impact on his personality and his view of the wizarding world. There are so many what - ifs that these fanfictions can explore. For example, how would Harry's magic develop under Snape's tutelage? And how would Snape deal with Harry's friends like Ron and Hermione? All these aspects make the 'Harry raised by Snape' fanfictions really captivating.
The popularity of 'Snape tutors Harry' fanfictions lies in the fact that it's a new take on a familiar relationship. In the original series, Snape and Harry have a rather strained relationship. Fanfiction writers can take this relationship and turn it into something positive through tutoring. It gives readers a sense of hope and redemption. We get to see Snape use his abilities for Harry's benefit, which is a contrast to their interactions in the books. This exploration of a different kind of relationship between the two characters is what draws many readers to these fanfictions.
Well, it's mainly because of the complex relationship between them in the original series. Snape's actions towards Harry were often ambiguous. Fanfiction writers like to explore the idea of Snape having deeper, loving feelings for Harry as a way to add more depth to their relationship. It also gives an opportunity to rewrite some parts of the story from a different perspective.