In fanfiction, Snape's own personality traits contribute to his hardness towards Hermione. He is a brooding and often moody character. Hermione's bright and positive nature might clash with his gloomy demeanor. Snape may not understand or appreciate Hermione's enthusiasm for learning in the same way other teachers do. His teaching methods are strict and unforgiving, and Hermione, with her high standards for herself, may be constantly trying to meet his expectations but always falling short in his eyes because of his unyielding nature.
Snape has a dark past and many secrets. In fanfiction, this could play into why he is hard for Hermione. His experiences with the Dark Arts and his relationship with Voldemort might make him view Hermione with suspicion. She's a Muggle - born, and in the wizarding world with its history of prejudice, Snape's own complex relationship with such issues could lead to him being hard on her. Also, Hermione's friendship with Harry Potter, who Snape has a very conflicted relationship with, could be a reason. Snape may think Hermione is involved in things that he wants to keep Harry away from, so he's difficult towards her.
One possible reason is Snape's prejudice. He might have some sort of bias against Gryffindors in general, and Hermione, being a very Gryffindor - like student, gets the brunt of it. He may expect her to make mistakes typical of Gryffindors like being overly bold without thinking. Another factor could be that Hermione is so intelligent and inquisitive that Snape feels threatened. He likes to be in control of the knowledge in his classroom, and Hermione's constant questions and thirst for knowledge might make him act tough towards her.
One possible reason could be a powerful spell gone wrong. Maybe she was caught in the crossfire of a dark magic spell that Snape was either trying to counter or was involved in accidentally. Another reason might be extreme emotional shock. For instance, if she discovered some dark secret about Snape that was so overwhelming it sent her into a catatonic state.
The possible reasons are numerous. For starters, fans might be interested in exploring the idea of how two very different characters like Snape and Hermione could be related. It could also be a way to give Hermione a more mysterious origin. Since Snape has such a complex and often misunderstood character in the original series, tying him to Hermione in this way can create interesting storylines. Additionally, it might be a form of wish - fulfillment for some fans who want to see a different kind of family structure in the Harry Potter universe.
Hermione is also very confident in her knowledge. Snape is an expert in Potions, but Hermione is no slouch either. So, when Snape tries to undermine her in Potions class, she might respond with sarcasm. For example, if Snape corrects her in a way that she thinks is wrong, she could say 'Of course, Professor, your infinite wisdom must be right' in a sarcastic tone.
In fanfiction, sometimes authors like to break boundaries and explore 'what - if' scenarios. For the 'Snape cheats on Hermione' idea, it could be a way to create drama and conflict. They might be interested in exploring the emotional turmoil it would cause for Hermione, or how it could change the relationships within the wizarding world they've created in their story. It could also be a way to subvert the typical hero - heroine relationships we see in the original series.
One possible reason could be a misunderstanding. Maybe Hermione thought Snape was involved in some dark plot against her friends. In the wizarding world, there are often secrets and deceptions, and if she got some false information, it could lead her to take such drastic action.
In some fanfictions, this might be explored. One possible reason could be the allure of the 'opposites attract' concept. Hermione is known for her studious and rule - abiding nature, while a snarky Snape in fanfiction might represent a wilder, more unpredictable side. It could also be a way to explore a different kind of dynamic between two complex characters that the original series didn't fully develop.
One reason could be Snape's knowledge. Hermione, being a knowledge - seeker herself, might feel safe knowing that Snape has a vast understanding of magic, especially the darker aspects. So, she believes he can keep her safe from any threats related to that knowledge.
Some fanfiction writers might do it for shock value. They want to create a very different and extreme situation compared to the original story to attract readers' attention.
One reason could be that Snape believes Hermione has knowledge that is dangerous if it falls into the wrong hands. So, he kidnaps her to keep her safe until he can figure out what to do with that knowledge. Another possibility is that he is being controlled by some dark magic or an outside force which compels him to take her against his will.
One reason could be the re - imagining of Snape's character. In fanfiction, he might be kinder and more understanding towards Hermione than in the original story. So, she feels safe in his presence.