In the fanfiction, perhaps Lupin is initially attracted to Hermione's vast knowledge of magic. Hermione might be the one who truly understands Lupin's inner turmoil about his werewolf nature better than Tonks does. She could offer him a different kind of support, not just emotional but also intellectual, which makes him choose her over Tonks.
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.
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.
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.
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, it could be about Teddy having a dream where he meets his parents. In the dream, Remus and Tonks are as he's always imagined them. They tell him how proud they are of him, even though they didn't get to see him grow up. This simple encounter could be a very moving and emotional one, with Teddy waking up with a newfound sense of purpose and connection to his parents.
Maybe Remus leaves because he feels unworthy. He has always seen himself as a danger and an outcast. Despite Tonks's love, he can't shake off his self - loathing. So, in the fanfiction, he leaves while Tonks is pregnant, leaving her heartbroken. However, their friends, like the members of the Order of the Phoenix, might try to convince Remus to come back and be a family with Tonks.
One possible plotline could be that Hermione starts flirting with Remus as a way to learn more about the wizarding world's history from his perspective. Since he's older and has experienced a lot, her flirting is a means to an end at first, but then it develops into something more.
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.
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.
A possible plot could be set in a post - war Hogwarts where everything is in chaos. Hermione is at the center of rebuilding the magical knowledge, and Remus is attracted to her intelligence and leadership. Tonks, who has always loved Remus, feels left behind. The story could then revolve around Tonks' attempts to understand Remus' new feelings, Hermione's obliviousness to the whole situation, and Remus' internal struggle between his old feelings for Tonks and his new - found attraction to Hermione. This would create a complex web of relationships and emotions within the fanfiction.
In fanfiction, Sirius and Remus could fight over Hermione because of their different relationships with Harry. Since Hermione is Harry's close friend, Sirius might think that he should have more influence over Hermione to help Harry better, as he is Harry's godfather. On the other hand, Remus, being Harry's former teacher and friend, also feels a sense of responsibility towards Hermione because of her connection to Harry. This clash of responsibilities and their own personal feelings for Hermione can spark a fight.