One possible plot could be that Ron and Hermione suspect Harry is involved in some dangerous secret magic that could put him in harm's way. So they spy on him to find out more and end up discovering it's all a big misunderstanding. Maybe Harry was just trying to surprise them with a new spell he learned.
In some fanfictions, Ron and Hermione might spy on Harry because they think he's getting too close to a new character who they suspect has ulterior motives. They follow him around, eavesdrop on his conversations, and through this spying, they might learn that the new character is actually an old friend in disguise. This could lead to a lot of comical and also heartwarming moments in the story.
In some fanfictions, it could be a misunderstanding that spirals out of control. Hermione and Ron misinterpret one of Harry's actions. For instance, Harry might be trying to protect them in a secret way, but it looks like he's up to something bad. Their lack of trust then grows, and they end up betraying Harry, perhaps by not coming to his aid when he really needs them, which could have serious consequences for Harry.
In a 'Ron is caught abusing Hermione fanfiction', a possible plot could start with a build - up of Ron's frustration and anger towards Hermione over a series of misunderstandings. This could lead to the abuse situation. Once he's caught, the magical community might get involved. There could be a trial - like scenario where Ron has to face the consequences. Hermione, on the other hand, might struggle with whether to forgive Ron or not. Meanwhile, their friends could be divided in their opinions. Some might side with Hermione immediately, while others might try to understand Ron's side of the story. This could create a complex web of relationships and character development throughout the fanfiction.
One possible plot could be that in an alternate universe, Harry and Ron got married for some reason, perhaps due to a magical bond gone wrong. Then as they grow older, they realize they have different life goals and values, leading to their divorce. For example, Harry might be more focused on fighting dark magic still while Ron wants a more peaceful domestic life.
The main characters are obviously Ron, Hermione, and Harry. Ron is often portrayed as the more impulsive one of the two spies, while Hermione is the more methodical and detail - oriented. Harry, on the other hand, is the one being spied on, who is usually oblivious to their actions at first.
Hermione might seek revenge. Given her intelligence and magical abilities, she could use her skills to get back at Harry and Ron for their betrayal. This could lead to a big rift in their friendship and even endanger their common goals in the wizarding world. She might also side with other characters who are against Harry and Ron, changing the whole dynamic of the story.
It could be that Harry has been influenced by some external force. In fanfiction, there could be a new dark wizard or a magical object that is affecting his mind. This new influence might make him think that Ron and Hermione are in danger if he stays close to them, so he ignores them to keep them safe.
In some fanfiction scenarios, it could be a matter of different ideals. Suppose there is a new movement in the wizarding world that Ron and Hermione believe in, but Harry opposes it. Their loyalty to this new ideology could be so strong that they see Harry as an obstacle and decide to betray him. It could also be that they are under the influence of a powerful and evil spell that warps their minds and makes them act against Harry without their full awareness.
In a fanfic with this theme, perhaps Hermione discovers that Ron has some habits or values that she can't tolerate in the long run. For instance, his lack of punctuality or his laid - back attitude towards certain important matters. She might start to compare her relationship with Ron to what she could have had with someone else, like Viktor Krum. She may regret choosing Ron when she sees how much more in - sync she could have been with someone who shares her passion for knowledge and self - improvement on a more consistent level. It could also be that Ron's family dynamics start to weigh on Hermione more as time passes. The chaos and sometimes backward - thinking in the Weasley family might make her feel out of place and question her choice to marry into it.
One possible plot could be that they disappear to a parallel magical dimension. In this dimension, they have to learn new forms of magic to survive and find their way back home. Maybe they encounter strange magical creatures that are unknown in their own world.
Jealousy might be a motive. If Hermione is constantly outshining them in academics or getting more praise from teachers, they could become envious and turn against her.