A possible plot could be that Hermione is completely against the marriage law at first. She tries to find ways to get out of the arranged marriage with Theodore Nott. But Theodore, on the other hand, has a more practical view. He thinks that they can make the best of the situation. As they interact more, Hermione realizes that Theodore is not the typical Slytherin she thought he was. He has a deep love for knowledge, just like her. They begin to study together, sharing their different perspectives on magic. This mutual exploration of magic could be a key factor in their relationship development under the marriage law.
Another idea is a post - war scenario. Theodore, who has been trying to distance himself from his Death Eater father's legacy, meets Hermione while she is on a mission to help rehabilitate former Slytherins. They form an unlikely alliance and eventually fall in love as they face various challenges together in a changed wizarding world.
A great plot twist could be that Theodore Nott is secretly working for an underground organization that is trying to undermine the new post - war Hogwarts order, and Hermione discovers this. It would create a huge conflict between them, especially since Hermione has been working hard to build a united Hogwarts. However, it could later be revealed that Theodore was actually a double agent, trying to expose the real villains within the organization.
At first, their relationship might be full of distrust. Hermione may suspect Theodore of having ulterior motives due to his Slytherin background. But as time passes, they start to understand each other better. They could share their love for books and knowledge, which could be a bridge between them. Eventually, they might develop a deep bond of friendship and perhaps more, as they realize they have more in common than they thought.
One possible fanfiction could start with Hermione and Theodore Nott being paired up for a difficult potions project. At first, they're both a bit wary of each other. Hermione is used to working with Gryffindors, and Theodore has his Slytherin pride. But as they start to experiment with the potions ingredients, they begin to see that they have more in common than they thought. Their shared love for knowledge and academic excellence starts to break down the barriers between them.
Maybe the marriage law causes chaos in the wizarding world and Fred and Hermione, being the smart and resourceful ones, decide to use this situation to their advantage. They could start a business together, using their combined skills in magic and charm, all while dealing with their new 'forced' relationship. They gradually fall in love as they face challenges side by side.
One idea could be that they initially resist the marriage law but gradually find common ground in their love for knowledge. They start sharing potions recipes and Hermione teaches Severus about Muggle literature. Their relationship evolves from a forced union to a real, loving one as they discover each other's hidden depths.
One idea could be that the marriage law forces Hermione and Neville to get married, but at first they are hesitant. However, as they start to live together, they discover each other's hidden talents. For example, Neville shows his amazing skills in herbology which Hermione admires. They gradually fall in love as they face challenges together, like dealing with the expectations of their friends and family who had different ideas about their relationship.
Maybe in the fanfiction, the marriage law is a ploy by a dark wizard to disrupt the order in Hogwarts. Hermione and Minerva have to pretend to be happily married to fool the enemy. During this time, they learn about each other's insecurities and strengths. Hermione might introduce Minerva to some modern Muggle concepts that could be useful in their fight against the dark forces, and their relationship gradually turns into a real and deep connection.
A plot could revolve around a marriage law that was created to strengthen pure - blood and half - blood relations. Hermione, being a Muggle - born, faces a lot of opposition. Harry stands by her side and they fight against the discriminatory aspects of the law. They could go on a journey to find ancient magic that could nullify this unjust law. Along the way, they meet different characters who either help or hinder them, and their relationship grows stronger as they face these difficulties together.
Well, a great plot idea could be that they are paired by the Marriage Law and have to pretend to be a happy couple in public for some political or social reasons in the wizarding world. But in private, they are constantly bickering. As time goes on, they find that they can't help but fall for each other. They might also face challenges from Draco's old Death Eater associates who don't approve of his union with Hermione.