In this fanfiction, it could be that Ginny is involved in some sort of gossip or spreading rumors. Hermione, who values truth and integrity, confronts Ginny about it. She might scold Ginny for being irresponsible with her words and how it can harm others' reputations at Hogwarts.
One possible plot could be that Hermione tells off Molly for being overprotective of Ron. Maybe Molly is constantly interfering in Ron and Hermione's relationship, and Hermione finally has enough and gives her a piece of her mind about respecting their privacy and decisions as adults.
Ron could be one of the main characters. Since he is Hermione's boyfriend and Ginny's brother, he might be caught in the middle of their conflict. He could try to play the peacemaker or end up taking sides, which would further complicate the situation.
In a fanfiction, it could be that Ginny is being too reckless. Hermione, being the more cautious one, is always worried about getting into trouble. If Ginny is constantly sneaking out or getting involved in dangerous adventures, Hermione might yell at her to stop putting herself and others at risk.
In a fanfiction, Ginny could be out to get Hermione because of a prophecy or some sort of ancient magic that pits them against each other. Maybe there's a hidden aspect of their characters' destinies that was never revealed in the original series. For example, a prophecy that only one of them can fulfill a great task at Hogwarts, and Ginny, believing it should be her, decides to undermine Hermione.
A simple outcome could be that they have a heated argument and then make up quickly. They realize they both care about the same things in different ways. For example, they both care about their friends' well - being but just have different approaches.
One possible reason could be jealousy. Maybe Ginny is jealous of Hermione's close friendship with Harry or her academic achievements. In the wizarding world, relationships can be complex, and Ginny might feel overshadowed by Hermione at times.
It could also be related to a boy. If both Ginny and Hermione are interested in the same guy, say Harry Potter, Hermione might stand up to Ginny to assert her own feelings or to clarify some misunderstandings that Ginny has about her relationship with the boy. This can create a tense situation between them in the fanfiction.
In many fanfictions where Hermione confronts Ginny Weasley, it often stems from a conflict over a boy, like Harry. Hermione might feel that Ginny is being too forward or not taking Harry's feelings into account. For example, if Ginny is making big moves on Harry without considering how it affects his studies or his mental state, Hermione, being the practical and studious one, could confront her. It could also be about their different personalities clashing in the context of the wizarding world's social dynamics.
Another storyline might involve Ginny and Hermione teaming up to solve a mystery within Hogwarts. Maybe there are strange disappearances of students and they use their combined skills, Ginny's Quidditch - related quick thinking and Hermione's vast knowledge, to get to the bottom of it. They might suspect a hidden chamber or a rogue spellcaster. They start by interviewing students and staff, gathering clues from different parts of the castle, and finally unmask the culprit.
One possible plot could be that Hermione is seeking advice from Bill about curse - breaking. Since Bill is an experienced curse - breaker, Hermione wants to learn more about it for her own studies or for a mission she's on. They meet in the Burrow's garden, and Bill shares his exciting tales from his adventures, which both educates and amuses Hermione.