At first, it could be very rocky. Fenrir's wild nature and Hermione's proper upbringing might clash. But as they get to know each other more, they could start to see the good in one another. For example, Fenrir might be impressed by Hermione's intelligence and Hermione might see the vulnerability beneath Fenrir's tough exterior.
They might start off as friends. Hermione would be curious about Emmett and his world, and Emmett would be intrigued by Hermione's intelligence. As they spend more time together, their feelings could deepen into love.
In the fanfic, it might lead to a story where Fenrir tries to protect Hermione in his own way. Since she's his mate, he could see her as something precious to him. This might put him at odds with other dark forces in the wizarding world who might want to harm Hermione for various reasons. It could also cause a stir among Hermione's friends, like Harry and Ron, who would be very suspicious of Fenrir's intentions towards her.
Sure, it's possible. In the world of fanfiction, all kinds of pairings are explored. This particular one could lead to some very intense stories. For example, it could show how Hermione, with her intelligence and magic skills, copes with being Fenrir's mate. It might also delve into the werewolf lore within the Harry Potter universe more deeply, like how their relationship affects Fenrir's lycanthropy and Hermione's standing in the wizarding world.
In the wizarding world, Hermione is associated with the light side and Fenrir with the dark side to some extent. For their relationship to work, they would have to bridge this gap. Maybe Fenrir could be redeemed through Hermione's love and influence. Hermione, on the other hand, would have to accept Fenrir's werewolf nature, which might put her in danger. It would be a relationship full of challenges and sacrifices, but also one that could potentially change the way the wizarding world views werewolves.
Harry might be initially shocked. He has been brought up in the wizarding world with certain beliefs and Fenrir is a werewolf, a feared and often misunderstood being. So, his first reaction could be disbelief. He might question how this could be possible considering their different natures.
One possible plot could be that Hermione discovers she has some sort of connection to Fenrir through a magical bond. She initially resists it due to his dark nature but as she gets to know him better, she realizes there is more to him. Maybe she tries to help him control his werewolf side and in the process, they develop a relationship that is frowned upon by the wizarding community.
Their relationship could start with Hermione being cautious. She might initially see Fenrir as a threat despite his 'good' nature. But as she gets to know him better, she realizes his potential for good. They could start working together on small projects, like helping other werewolves in the community, which gradually builds trust between them.
I'm not sure if there is such a specific fanfiction. It seems like a rather dark and unusual pairing considering Fenrir Greyback is a werewolf known for his brutality. However, the world of fanfiction is vast, and there might be some out there that explore this concept, but it's not a common or mainstream idea in the Harry Potter fanfiction community.
Their relationship could start with Hermione being a captive of Fenrir. But instead of harming her immediately, he becomes intrigued by her intelligence. As time passes, Hermione might start to see some humanity in Fenrir that others don't, and they could form an unlikely alliance against a common enemy.
A fanfiction with Hermione as Fenrir Greyback's mate would likely be a complex exploration of two very different characters. Hermione would bring her knowledge, determination, and moral compass to the relationship. Greyback, with his werewolf instincts and violent past, would be a contrast. It could show how Hermione might try to civilize Greyback, or how she copes with being associated with such a feared figure. The story could also involve the reactions of other characters like Harry and Ron, who would surely be horrified. It might also explore the werewolf society and how Hermione fits into it, all while dealing with the power dynamics between her and Greyback.