One possibility is that the fanfic delves into Hermione's over - studying for their third - year classes and how Harry tries to get her to relax a bit. They might have an adventure in Hogsmeade that goes wrong when they encounter some dark magic remnants from Sirius Black's escape. Harry could use his skills on the Quidditch pitch to boost his confidence, and Hermione would be there cheering him on while also secretly worrying about the lurking danger around them.
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.
Well, in this fanfiction, they might start to develop a new friendship on the train during their 3rd year. They could share secrets or talk about their hopes for the new school year. Daphne might be reading a really interesting book and Harry could ask her about it, starting a conversation that leads to them getting to know each other better.
Well, I've also read 'Harry and Hermione: Third - Year Escapades'. In this one, they embark on an unexpected journey outside of Hogwarts due to a prophecy they discover. Their third - year knowledge and skills are put to the test as they encounter various magical creatures and obstacles along the way.
Maybe in that fanfic's plot, there was a misunderstanding that got out of hand. Suppose Harry was framed for something terrible, and Hermione, believing the false evidence, felt that she had to take drastic action to protect the wizarding world from what she thought was a great threat, so she kills him. But later she realizes her mistake.
One possibility is that the truth potion gets misused. For example, an enemy of Harry and Hermione might get their hands on it and try to use it on them. But Hermione, being the brilliant witch she is, could find a way to turn the situation around. She might use her knowledge and quick thinking to make the enemy believe false information while under the influence of the potion. And this could be a crucial part in their fight against the dark forces.
Perhaps the collar is a cursed object that Hermione and Harry need to deal with. It could be causing strange behavior among the students. For instance, those who touch it start acting like animals. Hermione would use her extensive knowledge of magic to research a solution, while Harry would be more hands - on, trying to keep the affected students safe.
In the fanfic, they might start by discussing the magical creatures in the zoo. Maybe they'll share their thoughts on how muggles perceive these animals without knowing their true magical nature.
Well, they might discover their shared love for magic right away. Maybe they find some strange magical creature together and start to figure out how to take care of it. This could be a start of their magical adventures even before Hogwarts.
He might face challenges similar to what Harry did. Maybe he has to deal with a bully who mocks his parents' fame. Just like Harry had Draco, his son could have someone who gives him a hard time right from the start.
One interesting 'Harry and Hermione 3rd year fanfiction' story could be about their adventures in dealing with the time - turner mystery in a different way. Maybe they discover a new spell related to time while trying to solve the mystery of Sirius Black.