They could each write their own version of the fanfiction based on their ideas and then combine the best parts. This way, they both get to have their say in how Harry is presented and what happens in the story, and it could lead to a more interesting and inclusive fanfiction in the end.
One reason could be that they might have different interpretations of Harry's character in the fanfiction. Hermione, being logical, may see Harry in a more practical light, while Ron, with his emotional side, could have a different view.
One reason could be jealousy. Maybe Ron feels that Harry is getting too close to Hermione and he's afraid of losing her attention. In fanfiction, authors often play with the characters' emotions. Harry, on the other hand, might see Ron as being too possessive of Hermione.
The fight could also make them re - evaluate their relationship with Hermione and each other. They might realize that they've been taking their friendship for granted. For instance, Harry might think about how important Ron is to him, not just as a friend but also as someone who has always been there, and the same for Ron. And they'll have to work hard to repair their friendship.
Harry could make it up to Hermione by doing something special for her. Maybe he could find a rare book for her library in the wizarding world or help her with a project she's been struggling with. This would show her that he really cares and wants to make amends.
Perhaps they have different ideas about the plot direction. Hermione, being the studious type, may want the fanfiction to follow a more logical and complex plot with Harry involved in solving mysteries or learning new magic. Ginny, on the other hand, might be more interested in a plot that showcases Harry's relationships, especially his relationship with her. So, this clash of interests could lead to a fight.
Ron could realize his mistake and sincerely apologize to Hermione. He might give her a heartfelt speech about how much he values her and didn't mean to hurt her.
In fanfiction, Hermione might choose Harry over Ron because Harry often has a more heroic image. He is the Boy Who Lived, and his adventures are often more central to the main plot. Hermione could be attracted to his leadership qualities and the fact that he always seems to be at the heart of the action.
In this fanfic, the relationship between Hermione and Ron might be explored through the eyes of other characters. For instance, Harry might notice the small glances and touches between them that he hadn't paid much attention to before. It could also show how their relationship affects the group dynamic. With Hermione choosing Ron, it changes the way the trio interacts. And it could explore their future together, imagining how they would build a life as a couple in the wizarding world, dealing with things like family, career, and their place in the wizarding society.
Well, in certain fanfiction scenarios, Ron's jealousy could be a factor. He might feel overshadowed by Harry for so long that it finally drives a wedge between them, and Hermione, being in a relationship with Ron, gets caught up in it. Another possibility is that a prophecy or some ancient magic forces them to make choices that seem like a betrayal to Harry, but they believe they are doing it for the greater good.
There could also be a situation where they are competing with Harry for something, like a powerful magical item or a position in a wizarding organization. In their eagerness to win, they might use underhanded tactics that cause harm to Harry. For instance, they could steal his research notes related to the item, causing him to waste a lot of time and energy, and also feeling betrayed by his friends.