One interesting plotline could be that Draco and Hermione are forced to work together in a post - war magical reconstruction project. As they spend time together, they start to see each other in a new light and gradually fall in love. Eventually, they rise to become king and queen - like figures in the wizarding world, leading with a new sense of unity.
Draco often develops from a prejudiced pure - blood to a more open - minded individual. He starts to question his family's beliefs and values as he gets closer to Hermione. Hermione, on the other hand, learns to look past Draco's past actions and see the potential for good in him. Their relationship growth is a big part of their character development as they become the king and queen - like figures in the fanfiction.
A popular plotline is the redemption arc for Draco. In these fanfictions, Hermione might be the catalyst for his change. He realizes the error of his ways under the influence of her strong moral compass. There could also be a plotline where they are competing for the same goal, like a powerful magical artifact. As they hiss and argue throughout the competition, they gradually develop feelings for each other. Also, some fanfictions have a plot where they are both involved in a dangerous situation outside of Hogwarts, like in the wizarding underworld, and they have to rely on each other to survive.
One interesting plotline could be that Draco and Hermione are forced to work together in a cancer research project at Hogwarts. They start off hating each other as always, but as they see the effects of cancer on patients, they gradually put aside their differences. Hermione's vast knowledge of magic and Draco's family's connections to certain potions ingredients could lead to them making a significant discovery in the fight against cancer in the wizarding world.
One interesting plotline could be Hermione trying to cure a werewolf - affected Draco. Maybe she discovers a new spell or potion that can ease his lycanthropy symptoms. It could lead to a lot of tense moments as they have to trust each other despite their past differences.
Perhaps a plot where they all become animagi and have to use their animal forms to solve a mystery in the Forbidden Forest. Draco as a sleek snake, Harry as a stag, and Hermione as an otter, they must navigate the forest's dangers and uncover the truth about a strange magical disturbance.
One possible plotline could be that Draco, in his 'evil' guise, is initially set on causing trouble for Hermione at Hogwarts. But as the story progresses, he might start to have complex feelings for her, leading to an internal struggle between his dark intentions and new - found emotions.
Another plotline could be that the marriage contract is part of a larger magical plot. Maybe it was set up by an ancient magical family to bring about some sort of magical balance. Draco and Hermione then have to figure out the real purpose behind the contract while also dealing with their growing feelings for each other. Along the way, they might encounter old magical artifacts or spells that are related to the contract, which could put them in dangerous situations.
In some fanfictions, it might be a situation where they are forced to work together in a bathroom renovation project at Hogwarts. They enter the shower area to check on the new magical plumbing. There, they discover a hidden magical artifact. This discovery makes them realize they need to rely on each other's skills, Hermione's book knowledge and Draco's knowledge of dark artifacts. As they search for more information about the artifact in the shower area, their relationship begins to change.
One interesting plotline could be how Hermione and Draco initially resist the marriage law. They come from different backgrounds and have had animosity in the past. But as they are forced to live together, they start to discover each other's hidden qualities. For example, Hermione might find that Draco has a soft side when it comes to his family, and Draco could see Hermione's intelligence as not just a threat but something to admire.
One interesting plotline could be Hermione struggling to fit in Slytherin at first. She's used to the values of Gryffindor, so being in Slytherin where ambition and cunning are prized in a different way would be a big adjustment. For example, she might have to deal with the initial suspicion from her Slytherin housemates who are not used to having a 'Mudblood' among them. But as time goes on, she could use her intelligence to show them that she belongs there and maybe even change some of their views on blood purity.