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.
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 fanfiction could be 'A New Beginning for Potter and Delacour'. It delves into how Harry and Fleur navigate their relationship post - marriage, dealing with the cultural differences between the British wizarding world and Fleur's French heritage. They face challenges like how to raise their children with a blend of both cultures.
Another interesting one is 'Fleur and Harry: A New Beginning'. This story focuses on their personal growth as a couple. It portrays how Harry, with his Gryffindor courage, and Fleur, with her Beauxbatons charm, learn to understand and love each other more deeply in their married life.
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.
Perhaps Fleur Delacour's sister is an exchange student from Beauxbatons to Hogwarts for a special program. She arrives with high expectations but is met with some resistance from the Hogwarts students who are a bit jealous of her connection to Fleur. However, she quickly proves herself by being extremely talented in a different area of magic, like potion - making. She then enters the Triwizard Tournament as an honorary contestant (due to some special rule) and has to face various challenges, all while trying to make friends and fit in at Hogwarts.
A unique plotline could be where their marriage causes a stir in the wizarding society due to Fleur being part - Veela. Some people are jealous or suspicious of their union. But they prove everyone wrong by using their combined powers to do good, like renovating wizarding orphanages.
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.
In fanfiction, their marriage could bring together two very different magical worlds. Fleur, with her Veela charm and French magical heritage, and Harry, the famous Boy Who Lived. It might start with them getting to know each other better after the war. Fleur could see Harry's true courage and kindness, not just his heroic deeds. Their wedding might be a grand affair, combining the best of British and French wizarding traditions. For example, there could be a magical feast with both English and French magical delicacies, and the ceremony could include spells unique to both cultures.
One possible plot could be that Harry and Daphne meet during a post - war Hogwarts reconstruction event. Daphne, who has always been intrigued by Harry's heroics, starts to interact with him more. As they get to know each other, they find they have a shared love for magical creatures. Their relationship blossoms from there, and they face some opposition from traditional pure - blood families who don't think Harry, a half - blood, is a suitable match for Daphne. But in the end, they overcome all odds and get married, with a grand ceremony at Hogwarts attended by all their friends and allies.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions from various fandoms, including Harry Potter. Just search for 'Harry Potter and Fleur Delacour married' and you'll get a list of relevant stories.