It might be that the fanfiction sets up a situation where Lupin and Hermione are forced to work closely together on a long - term project. During this time, they develop a deep bond. Hermione's dedication to the task and her kindness towards Lupin make him see her in a new light. And compared to Tonks, who may be off on other adventures, Hermione is right there with Lupin, leading him to choose her.
Maybe it's because Hermione represents a new beginning for Lupin. She has a different energy compared to Tonks. Lupin could be drawn to Hermione's thirst for knowledge and her ability to look at things from a unique perspective. In fanfiction, the author can create all sorts of reasons, and this could be one of them.
Well, one possibility could be that in this fanfiction, Lupin sees Hermione's intelligence and loyalty in a way that he feels a deeper connection with her compared to Tonks. Maybe Hermione helps him in some sort of magical research or during a difficult time at Hogwarts, and through those experiences, his feelings for her grow stronger than his feelings for Tonks.
Perhaps Remus first notices Hermione's kindness towards him regarding his werewolf condition. She doesn't shy away but instead tries to find ways to help him. This kindness grows into something more, and they start to share their feelings. Their relationship could develop as they face challenges together, like dealing with the prejudice against werewolves. Hermione's strong will and Remus' experience combine to make them a formidable pair in the fanfiction.
In some fanfictions, Remus Lupin might be hard for Hermione because of their age difference. Lupin is much older, and this can create complex power dynamics and social taboos in the relationship. Also, their personalities are quite different. Hermione is highly studious and often by - the - book, while Lupin has a more laid - back and world - weary nature, which could lead to clashes and difficulties in their interactions.
Also, it gives fans a chance to see different aspects of the 'Harry Potter' universe. Hermione is often associated with Harry and Ron, but in fanfiction with Remus, she gets to be in a different kind of relationship. It allows for new storylines and character developments that might not have been explored in the original books.
One possible scenario in this fanfiction could be that Teddy shows some unique magical abilities that remind Remus and Tonks of their own magical heritages. Maybe Teddy can transform in a way that combines both werewolf and metamorphmagus traits, which would be a really interesting plot point. It could also explore how Remus and Tonks, who had such a tragic end in the original story, get to experience some happy moments with their son Teddy through the magic of fanfiction.
One reason could be that Tonks has feelings for Remus. In the story, if Hermione and Remus have a close relationship, perhaps a friendship that Tonks misinterprets as something more, it could make her jealous. Hermione is very intelligent and if she and Remus share a bond over knowledge or magic, Tonks might feel left out. Also, Tonks might be insecure about her own relationship with Remus and see Hermione as a threat.
Maybe in this fanfiction, Remus and Hermione have shared some deep intellectual conversations that Tonks couldn't engage in as much. Hermione's knowledge of magic, both theoretical and practical, might have drawn Remus to her. Also, Hermione's determination and loyalty could be factors. She is fiercely loyal to her friends and would go to great lengths to protect them, which Remus might value highly.
Love against all odds is a very common theme. Given Remus' condition as a werewolf, they face a lot of opposition and prejudice. Fanfictions often explore how their love overcomes these difficulties.
In fanfiction, Hermione might choose Harry over Ron because Harry often has a more heroic image. He is the Boy Who Lived, and his adventures are often more central to the main plot. Hermione could be attracted to his leadership qualities and the fact that he always seems to be at the heart of the action.
There's also 'Love in the Shadows'. This fanfic focuses on the more secretive aspects of their relationship. It portrays how they communicate in the midst of Voldemort's rising power, with Tonks using her skills as an Auror to protect Remus, and their love growing stronger through shared hardships.