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.
One idea could be that the marriage law forces them to live together and they initially clash due to their different backgrounds. But as they get to know each other's true selves, they start to respect and even fall in love. For example, Hermione might introduce Draco to the value of Muggle - born magic and he could show her some of the more complex pure - blood magic traditions in a new light.
Maybe the marriage law causes a stir in the wizarding world. Draco and Hermione initially resist but then realize that for the sake of the baby, they need to make it work. The baby might be born with a special gift that is a combination of the Malfoy and Granger magic. They could have to deal with Draco's family not accepting Hermione at first, but the baby becomes the bridge that brings them all together in the end.
One idea could be that due to the marriage law, Draco and Ginny are forced together. At first, they are hostile towards each other because of their past differences. Draco's pure - blood pride clashes with Ginny's Weasley independence. But as time goes on, they start to see the good in each other. For example, Draco realizes Ginny's bravery and Ginny sees that Draco is not as bad as she thought.
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.
One plot idea could be the Oc and Hermione having to navigate the complex rules of the marriage law. Maybe they initially resist but gradually find common ground and unexpected feelings for each other. For example, they could be paired together by the law and at first be at odds, but as they face challenges in the wizarding world together, they start to rely on and care for one another.
One idea could be the initial shock and resistance from both George and Hermione. George might be still mourning Fred and not ready for such a sudden arrangement. Hermione, on the other hand, could be conflicted as she had feelings for Ron. They could start off as reluctant partners but gradually find common ground through their shared love for magic and their determination to fight against the unjust law together.
One idea could be that they initially resist the marriage law due to their different worlds in Hogwarts. Charlie is all about dragons and Hermione is focused on academics. But as they start to spend time together, they discover they share a love for magical creatures in a different way. Hermione starts to see the beauty in Charlie's wild dragon - taming ways, and Charlie is amazed by Hermione's vast knowledge which could be useful in dragon conservation.
One idea could be that the marriage law forces Hermione and Kingsley together, but at first they are resistant. However, as they start to get to know each other, they discover they have a shared love for justice and protecting the wizarding world. They then work together on various cases, gradually falling in love along the way.
One idea could be the forced marriage leading to a power struggle within the Death Eater ranks. Hermione, with her intelligence, might try to outwit Bellatrix and use the situation to gather intelligence for the Order. For example, she could pretend to be compliant while secretly passing on information.
One plot idea could be that the Marriage Law forces Hermione and Blaise together. At first, they are very reluctant and constantly bicker. But as they get to know each other's intelligence and hidden depths, they start to develop a grudging respect. Eventually, they find common ground in their love for knowledge and magic, and their relationship evolves into a real marriage.