Another plotline could be a love triangle where Narcissa was initially arranged to marry someone, but she has feelings for Sirius. Sirius, on the other hand, is conflicted because of their family differences and his own ideals. It could explore the complex emotions of love, duty, and family loyalty.
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 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.
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.
A plot could revolve around Narcissa and Sirius in their Hogwarts days. They could be involved in a mystery within the school, like a series of strange disappearances of students. Since they are both from the Black family, they might have some inside knowledge that helps them solve the mystery, and in the process, form an unexpected bond.
One interesting plotline could be Fem Harry learning magic in a more unorthodox way under Sirius's guidance. Since Sirius is a bit of a rebel, he might teach her some spells that are not typically part of the Hogwarts curriculum early on. Another plotline could involve Fem Harry dealing with the challenges of being a female in the wizarding world, which has its own set of expectations and biases, all while having Sirius as her main support system. And perhaps there could be a plot where they go on secret adventures together, exploring parts of the wizarding world that are off - limits or forgotten.
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 common theme is family conflict. Given that they come from the same family but have very different paths in life, fanfictions often explore how their family ties both bind and divide them. For example, the expectations of the Black family and how they each rebel against or conform to those in different ways.
In some 'sirius black after azkaban fanfiction', there could be a plotline where Sirius has to deal with the stigma of being an escaped convict, even though he was wrongly imprisoned. He might face distrust from some in the wizarding community. At the same time, he could be on a journey to find out who really betrayed his friends all those years ago, which leads him on an adventure full of mystery and danger.
One common plotline could be Sirius teaching Harry more about his family's history in a way Dumbledore didn't. For example, Sirius might share hidden secrets about the Potter family magic that Harry was never aware of.
Some fanfictions explore a scenario where Marlene survives the war and she and Sirius get a chance to rekindle their relationship. It delves into how they deal with the trauma of the war and their past feelings for each other. They might have to face the judgment of the wizarding society which has changed after the war. This plotline can be very emotional and complex as it involves a lot of character development and exploration of post - war wizarding world.
One common plotline is Sirius Black escaping from Azkaban earlier and secretly training Harry in advanced magic. Another could be Sirius and Harry going on a hidden adventure to uncover more about Harry's parents. There are also stories where Sirius plays a more active role in the fight against Voldemort at Hogwarts, using his knowledge of the Dark Arts and his Animagus form to their advantage.