It could be due to a time - travel related plot. Perhaps Hermione goes back in time and through some unforeseen circumstances, her family line gets intertwined with Sirius' family, making her his sister in an alternate timeline. This could involve her interfering with past events that change family structures.
In the fanfiction, the author might have created a completely new backstory for Hermione. Maybe her real parents were actually related to the Black family (Sirius' family). There could have been a secret affair or some other family drama in the past that led to Hermione being Sirius' sister, which was hidden until the events of the fanfiction unfold.
Well, in fanfiction, anything can be made possible. Maybe a long - lost family connection was revealed. It could be that there was some sort of secret adoption or a hidden family tree branch that ties them together. Writers of fanfiction often take creative liberties to explore such unique relationships that were not part of the original story.
Well, in fanfiction authors often take creative liberties. It could be part of an alternate universe scenario. For example, if there was a different timeline where the wizarding families were arranged differently. Hermione might have been adopted into the Black family (Narcissa's family) through some complex set of circumstances, like a deal between two powerful wizards to protect her from some dark force.
Well, in fanfiction, anything can happen. It could be that a spell or some magical accident in the past led to Hermione and Pansy being sisters. Maybe a time - traveling wizard messed with the past, causing their family trees to merge in a way that made them related. It's a really interesting concept that allows for a whole new set of character dynamics and storylines to be explored.
In fanfiction, anything can be possible. It could be due to some dark magic or a convoluted plot twist. Maybe a spell was cast long ago that altered Hermione's true parentage, or Voldemort could have used some form of mind control on her real parents to make them believe she was theirs when in fact she was his. However, this goes completely against the original lore of the series.
In fanfiction, anything can be possible. Maybe a powerful spell was cast that altered memories or blood relations. It could be part of a complex plot where Hermione was secretly switched at birth.
In fanfiction, this could be possible through some creative plot twists. Maybe there was a secret relationship between Severus and Hermione's mother that was hidden. It could also be a result of some magical interference or a prophecy that was misinterpreted at first. Another idea could be that Severus used some advanced magic to protect Hermione and in doing so, a special bond was formed that led to this unexpected 'father - daughter' relationship in the fanfic world.
Well, in fanfiction, the author has the liberty to play with the lore. There could be a scenario where a powerful dark magic spell in the past had some unforeseen consequences. This spell could have somehow intertwined the bloodlines of Voldemort and Hermione's family. Maybe a curse was placed on a family that later branched out to both Voldemort and Hermione's ancestors, creating this strange connection.
In fanfiction, it's often about bending the rules of the original universe. It could be possible through magical means that weren't explored in the original books. Maybe a powerful spell went wrong and created an unexpected bond between Hermione and Severus, leading to the birth of a baby. Another idea could be that in an alternate reality, their relationship developed in a completely different way, allowing for such a situation to occur.
It's important to remember that fanfiction is a space for creativity. Regarding Hermione's attraction to Rodolphus, perhaps the author wants to show how love or attraction can be unpredictable. Maybe there's a magical or psychological reason. For instance, a spell gone wrong that makes Hermione see Rodolphus in a different light, or she might be attracted to the power he represents in a strange way.
Well, in fanfiction, some authors might come up with the idea that there was some hidden connection or a secret affair in the past. Perhaps Voldemort had a relationship with Hermione's mother before he fully embraced the dark side. This would completely change the dynamics of Hermione's character and her place in the wizarding world. It could lead to her having to deal with the stigma of being related to the most evil wizard ever while still trying to uphold her values.