Another plot could involve Lucius being under a spell or a curse that makes him look after Hermione. In this scenario, he might initially be reluctant but as time passes, he starts to genuinely care for her. He could introduce her to parts of the wizarding world that she hasn't seen before, like some ancient magical libraries or secret spells, all while still being conflicted about his new role.
Perhaps Lucius has a secret mission that requires him to keep Hermione safe. This could be related to a prophecy or some powerful magical artifact. He might be forced to team up with Hermione, and during their time together, he starts to see her as more than just a mudblood (using the term in the context of the wizarding world's prejudice). He could come to respect her intelligence and courage and end up being a true protector.
Another plotline might involve a magical accident that causes Hermione to have a change in personality. This new, bolder Hermione starts flirting with Lucius out of curiosity and to see how the pure - blooded wizard will react. It could lead to some tense and interesting interactions between them.
A possible plotline is that Lucius, having a crush on Hermione, starts to question his loyalty to Voldemort. His feelings for her make him realize the wrongness of the pure - blood ideology. Another interesting one could be that Hermione, being the smart one, figures out Lucius's crush and uses it to manipulate him into helping the Order of the Phoenix. And there could be a plotline where Lucius tries to court Hermione in his own, rather clumsy, way which leads to some really awkward and yet endearing moments.
One possible plotline could be that Lucius realizes Hermione's importance in the wizarding world's future. Maybe he discovers a prophecy that involves her and decides to protect her from the dark forces that also threaten his own family. Another could be that Hermione somehow saves Lucius' son Draco from a dangerous situation, and out of gratitude, Lucius feels compelled to protect her.
Perhaps there's a plot where Lucius Malfoy is in a situation where he owes Hermione a debt. This could lead to a strange relationship where he has to follow her around and protect her. As time passes, he starts to develop unexpected feelings for her.
Another plot is a sort of forbidden love story. Given their different allegiances in the original series, a fanfiction might explore how Hermione and Lucius overcome their differences and fall in love. It could involve a lot of tension, secrecy, and internal conflict as they deal with their feelings and the reactions of the wizarding community.
One possible plotline could be that Hermione is magically bound to Lucius in some way during a complex spell gone wrong. This forces them to interact and gradually, she discovers a different side of him that she's attracted to. For example, he might show kindness towards a house - elf in front of her, which challenges her pre - conceived notions of him.
One interesting plotline could be the clash of their different ideologies. Hermione, with her strong beliefs in equality and justice, and Lucius, from a traditional pure - blood family with elitist views. Their marriage, forced by the law, might lead to a power struggle within the Malfoy household as Hermione tries to assert her values.
One plot idea could be that Lucius is forced to work with Hermione on a secret magical project for the Ministry. At first, they are at odds due to their different backgrounds and beliefs. But as they face various challenges together, they gradually come to understand each other. For example, they might have to deal with a powerful dark magic artifact that is causing chaos. Another idea is that in an alternate universe, Hermione is a spy in the Malfoy household and she has to pretend to befriend Lucius while secretly gathering information. This could lead to some tense and interesting interactions as Lucius is a shrewd character and Hermione has to be very careful not to be discovered.
In some fanfictions, Lucius might be forced into a situation where he has to rely on Hermione. For example, his family's fortune or status is at risk, and Hermione is the only one with the knowledge or skills to help. As he works with her, he discovers her many good qualities and becomes nice to her. This could lead to a whole series of events where they team up to face other threats in the wizarding world, all while their relationship evolves from one of necessity to one of mutual respect.
Maybe Lucius has a secret admiration for Hermione's tenacity. In a plotline, he could be under a curse that makes him see the good in those he once despised. This leads to him being charming towards Hermione. She, in turn, is initially suspicious but gradually starts to question her own views of him as he continues to be kind and helpful in unexpected ways.