Well, it might be good because it could have an interesting take on the characters of Hermione and Fenrir. Maybe it explores their relationship in a unique way that we haven't seen before in the original works.
Sorry, I'm not really sure of any specific ones similar to it off the top of my head. But you could try searching on fanfiction platforms using tags related to Hermione, Fenrir, and the genre of the original story it's based on.
In this fanfiction, their relationship could transform in a significant way. At first, they may have been more like acquaintances or even rivals among werewolves. But with Harry in the picture, they would be forced to communicate better. Remus could influence Fenrir to be more civilized, while Fenrir could make Remus more assertive. They would share the joys and sorrows of raising Harry, which would create a bond between them that was stronger than just their werewolf connection.
One of the great Danmachi fanfics is 'A Different Perspective'. It offers a fresh take on the characters and their relationships within the Danmachi universe. The story delves deeper into the backstories of some minor characters and makes them more significant. Another good one is 'The Unseen Adventures'. It takes the characters on new quests that are not in the original story, adding more excitement and mystery.