Harry could be flattered. Fleur is considered very beautiful, and for her to show interest in him would boost his self - esteem. He might stammer out a response, something like 'I - I'm honored, Fleur.' while blushing furiously.
One possible reason could be that Fleur sees Harry's courage. In the 'Golbery of Fire' events, Harry shows great bravery, and Fleur might be attracted to that. She herself is a confident and somewhat proud character, and a brave partner like Harry could be appealing to her.
Gilbert might be an original character created specifically for this fanfic. He could be a student at Hogwarts from the Fire Fleur house, which is likely a fictional house made up for the story. He may have unique magical abilities or a distinct personality that draws him to Harry.
In the fanfic, perhaps there will be a lot of blushing and nervousness from Harry. Maybe he's initially taken aback by Gilbert's forwardness. He might need some time to think about his feelings, as he has so much else going on in his life, like dealing with Voldemort and his Hogwarts studies.
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.
In many fanfics, Fleur is often depicted as strong - willed. She's a Veela, so she has that alluring quality, but she's also smart and not just a pretty face. For example, in some fanfics she uses her Veela charm in a strategic way to get what she wants or to protect others.
One possibility is that Harry would be really flustered. He's not used to such direct attention from someone as beautiful as Fleur. He might initially be in shock and not know how to respond. Then he would probably think about how this would affect his relationship with his friends, especially Hermione and Ron. Maybe he'd worry about Ron getting jealous since Ron has a bit of a crush on Fleur.
There's a fanfiction where Fleur asks Harry about his family. She wants to know more about the Potters and how they were so well - known in the wizarding world. It's a story that shows Fleur's curiosity about Harry's heritage. Also, 'Fleur and Harry: The Magic Exchange' has Fleur asking Harry about different types of magic he's learned at Hogwarts that are different from what she learned at Beauxbatons. It's really interesting as it compares the two magical educations.
Well, in fanfiction, Fleur could ask Harry about his views on love and marriage. This could start a whole new aspect of their relationship. For example, if Fleur is interested in Harry romantically, her asking such questions could lead to a deeper connection between them.
One possible scenario could be that Hermione finally realizes her deep - seated feelings for Harry. In the fanfic, perhaps after a particularly dangerous adventure where they almost lost each other. She might approach Harry in a quiet moment, like in the Gryffindor common room late at night when most students are asleep. She could be a bit nervous but determined as she asks him out for a walk by the lake or a trip to Hogsmeade. This would be a huge moment for their relationship as it takes a more romantic turn.