What are the possible reasons in the 'Hermione can speak Parseltongue' fanfic for Hermione to develop this ability?

One reason could be her thirst for knowledge. Hermione is known for her love of learning, so she might have decided to learn Bulgarian just for the sake of it. Another reason could be related to a relationship, like with Viktor Krum, which gives her an incentive to learn his native language.

Well, it could make some characters more wary of her. For example, those who are prejudiced against Parselmouths might view her with suspicion. However, it could also bring her closer to Harry, as he's the only other known Parselmouth among their group. They might bond over this unique ability and share their experiences related to it.

It might be related to an ancient magic that she unknowingly tapped into. There could be some long - forgotten spell or charm that she came across in her extensive research. It could also be a gift from a magical creature. Maybe she helped a magical snake in the past, and in return, it passed on the ability to communicate with snakes to her.

One possible reason is that the fanfic writer wants to create conflict. By making Hermione not believe Harry, it adds tension to the story.

In fanfics, the relationships between characters can be explored in new ways. If the fanfic writer decides to show a rift between Hermione and Harry for the sake of drama, they might create situations where Hermione doesn't believe Harry. This could be due to a series of miscommunications or actions that Harry takes which seem out of character to Hermione.

One reason could be to create drama. The shock value of Ron cheating on Hermione would be high, and it could lead to a lot of emotional turmoil in the story.

One possible reason could be that Hermione has a different romantic vision. In the original series, she might see Harry more as a friend. In the fanfic, her character could be written as being focused on her own personal growth and goals, which don't align with a romantic relationship with Harry.

One possible reason could be a miscommunication. Maybe Hermione accidentally reveals a secret of Harry's that he didn't want known, and this causes him to feel betrayed and start to hate her. Another reason could be jealousy. If Hermione gets more attention or praise for her magical abilities than Harry in the fanfic, he might develop feelings of envy and hatred. Or perhaps there's a love triangle situation where Hermione is involved with someone Harry doesn't like, and that causes his hatred.

One possible reason is copyright infringement. Parseltongue is a unique creation within the Harry Potter series. If a fanfic uses it without permission while charging, it's likely violating the copyright of the original work.

In the fanfic, it might be due to some sort of magic gone wrong. There could be a spell that made her act out of character. It's not unheard of in the wizarding world for spells to have unexpected effects on a person's behavior and relationships.