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 Lucius starts to see Hermione as a symbol of the light side of magic that he has long forgotten. He might be tired of the dark path he has been on and protecting Hermione could be his way of redeeming himself. He could secretly start providing her with information about threats from the dark side or help her when she is in trouble with the Death Eaters.
In some plotlines, Lucius could be under a spell or a curse that makes him have a sudden change of heart towards Hermione. This spell could be related to an ancient magic that Hermione herself is researching. And as a result, he has to protect her from those who would use her research for evil purposes.
One possible plotline could be that Lucius has a change of heart after seeing Hermione's bravery. Maybe in a dangerous situation at Hogwarts, he realizes that she is crucial to the wizarding world's future and decides to secretly protect her from dark forces that are after her knowledge or power. Another could be that Lucius is under some sort of spell or curse that makes him see Hermione as someone he must protect, like a strange form of redemption arc for him.
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.
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.
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.
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.
In this type of fanfiction, it could start with Hermione being an orphan for some reason. Lucius, seeing her magical abilities and intelligence, decides to take her in. At first, Hermione would be very much out of place in the Malfoy Manor. However, as time passes, she might start to change the Malfoy family's views little by little. Lucius would have to deal with the reactions of other pure - blood families, and Hermione would face challenges from both the Malfoy family's expectations and the outside world's perception of her being in the Malfoy household.
Sure, such fanfictions exist. A plot could involve Hermione finding out by accident, like through a long - lost family heirloom or a magical revelation. This discovery could send shockwaves through the wizarding community. Lucius might try to keep it a secret at first to protect his reputation, but as events unfold, he is forced to acknowledge Hermione publicly. This could lead to a reevaluation of the Malfoy family's standing in the wizarding world, and Hermione would have to deal with newfound family members, some of whom may not be welcoming, all while still being true to her friends and her own values.
One possible plotline could be a magical accident that causes Lucius to become pregnant. This could lead to him having to hide it from the other Death Eaters and the wizarding society in general, creating a lot of secrecy and tension. Another could be a spell gone wrong during some dark magic experiment. He would then have to deal with the physical and emotional changes while still trying to maintain his status in the wizarding world.
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.
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.