There could be. Fanfiction is a vast world. Some authors might explore such a complex relationship shift in their stories. However, it might not be as common as more typical pairings in the Harry Potter fandom. You could also check fanfiction communities on Reddit or Tumblr for recommendations.
Archive of Our Own (AO3) is a great place to start. It has a large collection of Harry Potter fanfiction, and you can use the search bar to look for stories with this specific plot. Just type in 'Fleur leaves Bill for Hermione' and see what comes up.
Yes, there might be such fanfiction in the vast world of Harry Potter fanfiction. Fanfiction often explores alternative storylines and relationships. However, this particular scenario goes against the original story's canon where Bill marries Fleur. But in fanfiction, writers can take creative liberties and come up with all sorts of interesting and unexpected twists.
In some fanfictions, Fleur might leave Bill for Harry because she realizes that Harry has a certain selfless quality that she admires more. Harry's constant fight against evil and his willingness to sacrifice himself could be very appealing to Fleur. Also, it could be that the fanfiction is set in a situation where Bill is involved in something that Fleur morally opposes, and Harry represents a more morally upright choice for her.
There might be such fanfiction out there, but it's not a very common or canon - compliant concept. In the original 'Harry Potter' series, Bill and Fleur are in love and get married. Fanfiction often explores alternative scenarios, but this one might be a bit of a stretch. It could be difficult to find a well - written piece on this specific topic as it goes against the established relationships in the books.
It would probably be full of drama. Bill would have to break Fleur's heart, which could be a very emotional and complex part of the story. Hermione, on the other hand, might be initially hesitant about getting involved with Bill as it goes against the normal relationships in the wizarding world. There could be a lot of tension between the three characters, and the fanfiction might explore how the other characters in the Harry Potter universe react to this unexpected change.
One possible plot could be that Bill discovers some new side of Hermione during their interactions in the wizarding world post - war. Maybe they work together on some important project and he starts to see her in a new light, gradually falling out of love with Fleur. Another plot might involve some sort of magic or spell that alters Bill's feelings, making him attracted to Hermione instead. However, this would be quite a complex plot to develop while still remaining somewhat true to the original characters.
She could interact with Luna Lovegood. Luna might share some of her unique insights or strange wizarding tales with Hermione during the wedding. Maybe they discuss some rare magical creatures that they both find fascinating.
In some fanfictions, Hermione might get involved in a magical mishap during the wedding. Maybe she accidentally casts a spell that causes some chaos among the guests, like making the flower arrangements come to life and start chasing people around. It could also be that she discovers a secret plot against the newlyweds during the wedding festivities.
It could cause a great deal of shock and gossip. The Weasley family, especially Bill's siblings, would likely be very angry and confused. There might be a rift between the Weasleys and Fleur, and perhaps even some tension between the Weasleys and Harry. After all, Bill is a well - liked member of the wizarding community.