One plotline could be that they are magically bound to the apartment and can't leave until they resolve some deep - seated issues between them. Maybe there's a spell that requires them to get along and understand each other's perspectives.
Another plotline might involve them sharing an apartment secretly while being on opposite sides of a magical conflict outside. Inside the apartment, they slowly realize that the other isn't as bad as they thought, and this changes their views in the greater conflict.
One great fanfiction about Hermione and Draco in an apartment is 'The Unexpected Roommates'. In this story, they are forced to share an apartment due to some magical mishap. It's really interesting to see how their initial hatred slowly turns into understanding and then something more. The author does a great job of portraying their characters realistically within this new living situation.
Well, one plotline could be that Hermione is heartbroken by Ron's cheating. Draco, who has secretly admired her from afar, steps in to comfort her. This leads to them exploring a relationship that was previously unthinkable due to their houses' rivalry.
Maybe they meet in a secret place during their school years, away from the prying eyes of their classmates. They start to exchange ideas and knowledge, which gradually turns into a deep emotional connection. This connection then leads to a secret marriage, and they have to deal with the consequences of hiding it from everyone they know.
One possible plotline could be that Hermione is obliviated due to a misfired spell during a battle. Draco, who has secretly had some admiration for her from afar, takes advantage of her memory - lost state and starts to court her. As they date, Hermione starts to develop new feelings for Draco, while Draco struggles with his conscience about her true identity.
One possible plotline could be that Draco kidnaps Hermione due to some dark family obligation related to her birth. Maybe there's a prophecy that involves her and his family wants to control the situation. Another could be that he's misinformed about her birth and thinks she's a threat to the wizarding world as he knew it. So, he takes her to figure out the truth.
A plotline could involve a mystery. There could be a strange phenomenon in the wizarding world that only Draco, with his godly powers, can solve. Hermione helps him in his investigations. As they dig deeper, they find out that it is related to an ancient curse that could threaten their relationship. They then have to find a way to break the curse while maintaining their bond. Also, there could be a plotline where Draco has to prove himself worthy of being a god in the eyes of the wizarding community, and Hermione is his biggest supporter throughout this process.
One possible plotline could be that they discover they have more in common than they thought. Maybe they start working together on a project in the wizarding world, like researching a long - forgotten magic. As they spend time together, they realize their feelings for each other have changed from hatred to love. To avoid the chaos that would ensue from their families and friends' reactions, they decide to marry secretly. Another idea is that they are forced into a situation where they have to pretend to be married for some magical reason, like protecting a powerful spell or object. During this time, they start to really fall for each other and end up making it a real, secret marriage.
One possible plotline could be that Draco realizes the error of his ways immediately after cheating. He spends a great deal of time groveling and trying to prove his love for Hermione anew. He might do grand gestures like giving her rare magical items or standing up to his old pure - blood supremacist friends when they say mean things about Hermione. Hermione, initially hurt and angry, gradually sees his sincerity and decides to forgive him as she still has deep feelings for him.
A plot could be that Draco and Hermione are in a situation where they are magically bound to each other for a certain task. Hermione makes a decision that Draco thinks is foolish and nearly gets them both in trouble. So, Draco punishes her by not allowing her to use her favorite magic items for a while. This makes Hermione frustrated but also makes her realize she needs to be more careful. Another idea is that in a fan - created magical world, Draco is in charge of a group that Hermione wants to be part of. She fails an initiation test set by Draco, and his punishment is to make her serve the group without having any of the privileges for a period of time. This could create a complex relationship between them as Hermione tries to earn her way back into Draco's good graces.
One possible plotline could be a story where Draco realizes his true feelings for Hermione later in life. He might initially approach her with the idea in a rather clumsy way, leading to a lot of misunderstandings and drama. For example, he could be from a family that is pressuring him to have an heir, and he sees Hermione as the perfect person to have a family with. But Hermione is focused on her career and has to decide if she wants to put that on hold for a relationship and potential pregnancy.