A possible plotline could be that after Draco bites Hermione, she starts to develop some vampiric traits herself. This causes a stir in the wizarding world and they have to go on the run together. Another could be that Draco bites Hermione as part of a dark ritual, but then realizes he has feelings for her and tries to reverse the effects.
One popular fanfic with this premise is 'Draco's Dark Desires'. It delves into the complex relationship that forms between Draco, as a vampire, and Hermione. The story is filled with tension as Hermione tries to understand her new situation and her feelings for Draco. Another is 'Vampire Draco's Bite'. It has a more action - packed plot where they have to face various challenges together after the bite.
A possible plotline might be that a dark wizard is after Hermione because of her new - discovered connection to the Malfoys. Draco, feeling a sense of family loyalty despite their differences, decides to protect her. Along the way, they learn more about their family's past and the reasons behind Hermione being separated from them. It could also involve Hermione trying to reconcile her Gryffindor values with the Slytherin - like values of the Malfoy family. There might be a scene where they have to face their parents together, and the Malfoy parents have to accept Hermione as their daughter, which would be a huge shift in their pure - blood ideology.
One possible plotline could be that they initially keep their relationship and marriage a secret because of the ongoing feud between the Gryffindors and Slytherins. Another could be that they are forced into a secret marriage due to some magical bond or prophecy. And they have to navigate their new relationship while hiding it from their families and friends.
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 it's a moment of unexpected playfulness between Draco and Harry. Maybe they are in a truce situation, and Draco, in a moment of light - heartedness, decides to tickle Harry as a form of friendly teasing. It could be a way to show a new side of their relationship, moving away from their usual rivalry.
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.
One possible plotline could be that Voldemort gives Hermione to Draco as a way to test Draco's loyalty. Draco, who has his own complex feelings towards Hermione, might initially be conflicted. He could be ordered to torture her for information, but instead, he tries to protect her in secret. This could lead to a series of events where they form an unlikely alliance against Voldemort.
Maybe they run away because of a prophecy that involves both of them. They initially don't trust each other but as they journey together, they realize they need to rely on one another. For example, Draco might use his family's knowledge of some hidden magic that can help them stay hidden, while Hermione uses her intelligence to decipher clues about the prophecy. Along the way, they encounter other outcasts from the wizarding world who join them in their quest. This could lead to a new kind of community being formed, away from the traditional Hogwarts - based society.
One possible plotline could be that Ron catches Hermione and Draco in a situation that is completely misinterpreted. Maybe they were just having a civilized conversation about schoolwork or magical theories, but Ron jumps to conclusions. For example, he might see them in a corner of the library and assume they are plotting something against him or Harry. Then, the story could revolve around Hermione and Draco trying to explain the situation to Ron, who is initially very angry and distrustful. This could lead to a series of events where Ron slowly realizes his mistake and they all learn a lesson about not jumping to conclusions.
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.