One possible reason could be that Fleur sees Harry as a powerful and important figure. In the wizarding world, Harry is the famous Boy Who Lived. Fleur might be possessive because she wants to be associated with his fame and power. Also, his bravery and skills could be attractive to her, making her want to have him all to herself in the fanfiction world.
In fanfiction, the writers often like to play with characters' emotions. Hermione might be possessive of Fleur because she feels a sense of competition. Fleur is known for her beauty and charm, and Hermione, being a strong - willed character, doesn't want to be overshadowed by her. This possessiveness could be a form of self - preservation in the fictional world they exist in.
Often, Luna Lovegood can be found in such fanfictions. Her unique and dreamy nature could bring a different dynamic to the harem. Neville Longbottom might also be involved in some way, perhaps as a friend who supports the harem and helps them out in times of need. There could also be some foreign exchange students or magical creatures in human form that end up in the harem for various reasons.
At first, their relationship might be a bit strained. Harry is used to his own space and friends, and Fleur has her own circle. But as they live together, they'll start to respect each other's differences. For example, Fleur might be more flamboyant in her magic use, while Harry is more practical. They'll start to see the value in each other's approaches and become closer friends.
One reason could be that in the original series, they are very close friends. Hermione might be possessive in fanfiction because she's protective of Harry. She's seen all he's been through and wants to keep him safe from harm, both physical and emotional, and this overprotectiveness can come across as possessiveness.
In fanfiction, Snape's possessiveness of Harry can stem from multiple factors. Snape has a deep - seated emotional turmoil within him. His feelings towards Harry might be a mixture of his unrequited love for Lily, Harry's mother, and his own self - imposed mission to safeguard Harry. He may also be possessive because Harry is constantly in danger, and Snape feels that only he can truly protect Harry, which in the world of fanfiction is often exaggerated and translated into possessive behavior.
Hermione would probably be a bit skeptical at first. She might worry that Harry is rushing into things. But once she sees how happy they are, she would be supportive. Ron, on the other hand, would be more accepting from the start, especially if there are good feasts at the wedding.
Often, Harry's sense of responsibility grows. He starts to see the marriage contract as not just a burden but also an opportunity to create a new life for himself and Fleur. Fleur's personality may develop in a way that she becomes more protective of Harry. For example, when they face opposition from the wizarding community about their contract, she stands up for them. She also might help Harry to overcome his insecurities about being in a relationship with someone as glamorous as her.
At first, they might be at odds with each other. Fleur could think Harry is too impulsive, while Harry might find Fleur a bit too haughty. But then, when they are forced to work together on a mission, they see the good in each other. Fleur realizes Harry's selfless nature, and Harry sees Fleur's intelligence and determination. This new - found respect leads to a romantic relationship and ultimately marriage.
In many fanfiction interpretations, Fleur's response would depend on how the author has developed her character. If the author has portrayed her as more open - minded and adventurous, she might quickly accept Harry's invitation with a smile. But if she is depicted as more cautious or reserved, she could decline politely, perhaps stating that she already has other plans or that she doesn't think it would be appropriate given the inter - school dynamics.