One interesting plotline could be how they deal with the reactions from their respective families. For example, Harry's friends might be shocked as Narcissa is from a Death Eater family. Another could be how they navigate the wizarding society together, perhaps changing the perception of Slytherins and Gryffindors getting along. Also, it might involve them working together to protect Draco, as Harry has a sense of justice and Narcissa wants to keep her son safe.
Some fanfictions might explore how their marriage affects the power dynamics in the wizarding world. With Harry being a hero of the wizarding world and Narcissa having connections to the old pure - blood families. Their union could either be a source of great change or a cause of much conflict. For instance, they might have to deal with the Ministry's reaction, as the Ministry may not be too keen on such an unorthodox union.
A possible plotline is their relationship development. Maybe it starts as a sort of political marriage to bring peace between different factions in the wizarding world. But as time goes on, they discover they have more in common than they thought. They could bond over their love for Draco in different ways, with Harry seeing a side of Narcissa that is a loving mother, and Narcissa seeing Harry's kindness and heroism in a new light.
In some versions of such fanfiction, it could explore how the wizarding society reacts to Narcissa Malfoy being in this position. Some might be appalled, some might see it as a chance for redemption for the Malfoy family. And all the while, Harry Potter is caught in the middle, trying to balance justice and mercy, which makes for a very engaging story.
One interesting plotline could be how they navigate the wizarding society's reactions. Since Daphne is from a different social circle than Harry, there might be challenges in how they are perceived together. For example, Daphne's pure - blood family might have certain expectations that contrast with Harry's more inclusive views. Another plotline could involve them using their combined magical skills to solve mysteries in the wizarding world. Harry's combat and survival skills along with Daphne's knowledge of potions and magic theory could make them a formidable team.
One interesting plotline could be the female Harry Potter adjusting to life in the Malfoy Manor. She might struggle with the pure - blood ideals that the Malfoys hold while also trying to keep her own identity. Another could be her relationship with Draco. Since they are now in a more family - like situation, their dynamic could change from the original enmity in the books. And she might also discover secrets about her parents from Narcissa that were previously unknown.
One interesting plotline could be Narcissa and Sirius having to team up against a common enemy in the wizarding world. Maybe there's a dark force threatening both the Black family's reputation and Sirius's fight for justice. They start off distrusting each other but gradually learn to work together.
One possible plotline could be that in a post - war world, Narcissa and Harry find themselves drawn to each other through mutual understanding. Maybe Harry sees a different side of Narcissa that was hidden during the war, and they start to build a relationship from there that leads to marriage.
Some fanfictions have a plot where Bellatrix and Narcissa discover a long - lost magical artifact. Their search for it and what they plan to do with it once found can lead to all sorts of interesting interactions with other characters like Harry Potter. For example, they might try to use it against him or it could be a way to redeem themselves.
A possible plotline is dealing with the media in the wizarding world. As Harry is a very well - known figure, their marriage would be big news. There could be tabloids writing all sorts of things about them, and they would have to handle the public scrutiny. Also, a plotline could involve them mentoring young wizards. Their unique relationship could be an example for the younger generation to learn about acceptance and different kinds of love. And they could pass on their magical skills in a new and innovative way.
In some fanfiction, Harry might get married in a secret ceremony to protect his family from a new threat. His friends would be the only ones in on the secret. The wedding could take place in a hidden location, like an ancient, enchanted forest. His wife could be a powerful witch who has her own secrets. Their marriage could be a key part of a bigger plan to defeat an emerging evil. There could be a lot of mystery and intrigue surrounding their relationship, with them having to keep their true feelings and intentions hidden from the outside world.
One possible plotline could be that Harry is raised in the Malfoy Manor. This would give him a very different upbringing compared to his life with the Dursleys. He might be taught different values and magic from a young age.
Well, a possible plotline might be that Harry saves Narcissa during a dangerous situation in the wizarding war. This act of heroism makes Narcissa see Harry in a new light, and he in turn is drawn to her vulnerability. As they interact more, their relationship blossoms. Or, it could be that they are brought together by some magical force or prophecy that they initially resist but eventually give in to their feelings.