Well, perhaps Fleur rejects Harry for some reason. Maybe she's still in love with Bill and tells Harry she can't be with him. This would leave Harry heartbroken as he might have developed deep feelings for her.
It could be that Fleur is under some kind of spell or obligation that forces her to break Harry's heart. In the wizarding world, there are many dark magics that could be used to manipulate relationships. For example, a love potion gone wrong or a dark wizard's curse that makes Fleur act out of character and break Harry's heart.
In this fanfiction, it might be that Fleur has to leave to protect Harry. She might be in danger herself and by distancing herself from Harry, she breaks his heart. Fleur is a strong and independent character. She could be involved in some dangerous plot that requires her to sacrifice her relationship with Harry for the greater good. This would leave Harry heartbroken, not understanding why she has left him.
He might become withdrawn. Harry has been through a lot in his life, and being heartbroken by Fleur could make him retreat into himself. He may avoid his friends and isolate in his dormitory at Hogwarts.
One possible plot could be that Harry and Fleur run away to escape the chaos of the wizarding world. Maybe they go to a far - off land where they can live in peace and explore magic on their own terms. They might discover new spells and magical creatures together.
Well, it could start with Fleur being assigned to work on some international wizarding cooperation project with Harry. As they work together, they discover mutual respect and admiration for each other. Then, there are obstacles like public opinion, as some wizards might not approve of their relationship due to cultural differences between Hogwarts and Beauxbatons. But in the end, they overcome these and get married. Their marriage could also bring about a new era of harmony between different wizarding schools.
Well, the plot could start during the Triwizard Tournament. Fleur could be injured during one of the tasks, and Harry comes to her rescue. This act of kindness makes Fleur see Harry in a new light. As the story progresses, they keep running into each other during the events leading up to the final battle against Voldemort. Their relationship deepens as they rely on each other for support and protection, and finally, they realize they have fallen in love.
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.
One possible plot could be that Harry and Fleur end up living together due to some post - war arrangements. They might initially have a bit of a cultural clash as Fleur is part - Veela and has her own French - influenced ways, while Harry is very much a product of the British wizarding world. But over time, they learn from each other and become friends. Harry could be teaching Fleur about some of the more unique aspects of Hogwarts' history that she might not know, and Fleur could be showing Harry some of the beautiful magic she learned in Beauxbatons.
It could be that they leave to attend a special magical training that is only available in a very secluded place. They might have received an invitation from a very powerful and reclusive wizard. This training could enhance their magical abilities in ways that Hogwarts or Beauxbatons couldn't. They see this as an opportunity to become stronger and more self - reliant, so they leave together, excited for the new challenges and knowledge that awaits them.
One possible plot could be that Fleur has been influenced by some dark magic or a powerful enemy. Maybe she's being blackmailed to kidnap Harry. She might take him to a hidden location, perhaps an old, abandoned castle. Then, the story could revolve around Harry trying to figure out why Fleur did this and how to escape while also dealing with Fleur's internal struggle about what she's done.
Fleur could use her Veela charm to try and disarm or distract vampires. Since Veela have a certain allure, it might work on vampires as well.
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.