One common plot is the 'slow burn' where Harry gradually realizes his feelings for Hermione over time. It might start with him getting jealous when Hermione spends time with other guys. Another plot could be a 'what - if' scenario, like what if Harry had realized his feelings earlier in the series and how that would have changed the events of the books.
Often, there are plots where Harry has to compete for Hermione's affection. This could be against Ron, or even new characters introduced in the fanfic. There are also fics where Harry and Hermione are put in dangerous situations together, and through those experiences, Harry's feelings for her deepen. It's like the shared danger makes him see her in a new light. Sometimes, there are also plots where magic or a spell goes wrong and causes Harry to have these strong feelings for Hermione that he then has to figure out how to deal with.
One common plot is revenge against those who bullied her at Hogwarts. Maybe some Slytherins were mean to her, and she uses her intelligence and magic to get back at them in creative ways.
One common theme is the exploration of friendship boundaries. When Harry is hurt by Hermione, it often shows how far a friend can go before crossing a line. For example, in many fanfics, Hermione's over - intellectualizing or her strong - willed nature causes her to accidentally harm Harry's feelings or even physically hurt him in some cases.
Friendship is a very common theme. Their strong bond as friends in the original series often gets expanded upon in fanfics. Writers might show them having deep conversations and relying on each other even more.
One common theme is the exploration of their personalities. Since they are both very different, fanfics often show how they complement each other. For example, Harry's bravery and Hermione's intelligence working together in new situations.
One common theme is friendship. Writers often explore how these three very different characters form a strong bond. Another theme is adventure. They usually go on various quests or face dangerous situations together. For example, in many fanfics, they might be on a mission to save Hogwarts from a new dark threat.
There are themes like forbidden love as well. Given the fact that in the original story, Hermione is with Ron, some fanfics play with the idea of Harry and Hermione's love being something that goes against the expected relationships. And of course, there are themes related to adventure and danger, where in the midst of facing threats in the wizarding world, their feelings for each other surface and lead to kisses.
One common theme is the exploration of their intellectual connection. Since both are very intelligent, fanfics often show how this aspect enhances their relationship. Another is dealing with jealousy from other characters, especially Ron. And sometimes, there are themes about them using their combined knowledge to solve big problems in the wizarding world.
Another theme is the breaking of taboos. Given that their relationship in the official story has a certain dynamic, lemon fanfics might play with the idea of going against the expected norms. For example, they might involve situations where their relationship is kept secret from their friends at Hogwarts. These fanfics can also focus on the power dynamics between them, as both Harry and Hermione are strong - willed characters. They may explore how their individual strengths and weaknesses play out in a more intimate relationship.
One common plot is Harry using his dragon form to surprise his enemies. He could swoop in during a battle and turn the tides. Another is that he discovers his animagus form while exploring some ancient magic in Hogwarts. It could be hidden in the Forbidden Forest or in a secret chamber.
A common plot could be their exploration of the Hogwarts grounds using the Marauder's Map. They might stumble upon some hidden passages or secrets that are related to the events of that year. Another one is dealing with the threat of Sirius Black. Hermione could be researching ways to protect Harry while Harry is more impulsive and wants to face the danger head - on. Also, there could be a sub - plot about their academic progress, like Hermione acing all her exams and trying to help Harry pass his, especially in subjects like Potions.