What could be the plot of a Harry Potter fanfiction centered around Fleur Delacour's sister?

Another idea for a fanfiction could be that Fleur Delacour's sister is a powerful witch in her own right but has a completely different approach to magic. While Fleur is all about grace and charm in her magic, her sister might be more into dark arts - not in an evil way, but in a way of studying it to understand how to combat it better. She could end up teaming up with the Trio (Harry, Ron, and Hermione) to fight against a new dark wizard threat at Hogwarts.

In the fanfiction, it could start with Fleur coming to Harry for help with something, like a dark magic threat in France that she believes Harry can assist with. During their adventure together, they rely on each other's skills. Harry is amazed by Fleur's magic, which is different from what he's used to in Hogwarts. Fleur is impressed by Harry's quick thinking. As time passes, they develop feelings for each other. Their relationship might face some opposition from those who don't understand their connection. But in the end, they get married. Their wedding could be a grand affair with both British and French magical traditions, and it could also show how their love overcomes all the differences and challenges.

Well, perhaps the marriage contract was made with an evil wizard. Fleur has to figure out a way to protect herself and her family. She teams up with some of the Order of the Phoenix members who are also interested in the ancient magic involved in the contract. They research in the Hogwarts library and other secret places to find a way to nullify the contract. In the process, Fleur also has to deal with the wizard who is trying to enforce the contract and his minions. This could lead to some exciting battles and tense moments.

In a friendship - centered fanfic, they could also be pen pals. After the Triwizard Tournament, they keep in touch by sending each other letters about their respective schools and magical cultures. Fleur could write about the beautiful architecture and strict etiquette at Beauxbatons, and Harry could share stories about the Gryffindor common room and Quidditch matches at Hogwarts.

A plot twist could be that Harry discovers a hidden prophecy related to his marriage with Fleur. This prophecy might involve a great danger that they have to face together, like an ancient dark magic that only their combined powers can defeat. It would add a layer of mystery and adventure to the fanfiction.

One interesting plot could be Fleur and Harry teaming up for a dangerous magical quest that was previously thought impossible. They could use their unique magical skills, like Fleur's Veela charm and Harry's Parseltongue ability, to overcome various obstacles.

The plot could involve Petunia using her witch powers to protect Harry from the Dursleys' abuse. She realizes that she has a responsibility towards her sister's son and uses her magic to create a safe haven for him within the Dursley household. This would be a big change from her original character who was so against magic.

She could be on a quest to clear her father's name. Since Sirius was wrongly accused of many things, she might dig into the past, find evidence that he was innocent all along. For instance, she could discover hidden letters or witnesses that were overlooked. This would lead her into many dangerous situations as there are those who would rather keep the truth buried.

Maybe Fleur has some ulterior motive. She could be under the influence of a dark wizard who forces her to kidnap Harry. Or perhaps she believes Harry has something she needs desperately, like a powerful magical item that she thinks can save her family or something.

A well - known one is 'Fleur and Harry: Magic Unbound'. This fanfic focuses on how Fleur and Harry accidentally stumble upon a long - lost magical spell that only they can master together. The story is filled with action and adventure as they try to keep this discovery from falling into the wrong hands, all while their friendship blossoms.