At first, Ron might be in disbelief. He might think it's some kind of joke. But when he realizes it's real, he could be a mix of hurt and confused. He might avoid Harry and Hermione for a while, but then, as he sees how happy they are at the ball, he might start to accept it and try to be happy for them too.
Hermione could be a bit hesitant. She's very practical and might worry about how it would affect their friendship or what others would think. But if Harry was sincere and persuasive, she'd likely come around. She might ask him a lot of questions about why he wants to go with her, and once satisfied with his answers, accept his invitation.
Hermione might be a bit surprised at first. She knows Harry well and might not have expected Fleur to ask him. But she would probably be happy for Harry in the end, as she's a good friend. She might also be a bit curious about how Fleur and Harry's relationship would develop.
Perhaps Hermione is so overjoyed that she immediately hugs Ron. She might have been secretly hoping for Ron to ask her all along. She then starts talking about what they should wear and how they can make their entrance at the Yule Ball really special.
Their friends' reactions could be quite mixed. Ron might be a bit jealous, especially since he has his own complicated feelings towards Hermione. He might not show it directly, but there could be some underlying tension. Harry, on the other hand, would probably be supportive. He's always been more open - minded and would see it as a chance for his two friends to have a good time. Ginny might be a bit surprised at first, but then she'd probably be excited for her brother and Hermione.
Hermione would probably be very skeptical at first. She's always been cautious about Draco, seeing him as a bully. She might try to dissuade Harry from going with him, warning her about all the possible tricks Draco could be up to.
Ginny might be in disbelief for a moment. She has always seen Harry as this heroic figure and now he's asking her to the ball. But then her natural confidence would take over and she would accept with enthusiasm. She would also tease Harry a little bit about taking so long to ask her, adding a bit of humor to the situation.
The teachers would have mixed reactions. Some, like Professor McGonagall, might be concerned about how this would affect the dynamics between the students. She would hope that there would be no trouble at the Yule Ball. Others, like Dumbledore, might see it as an opportunity for growth and change. He would probably be interested to see how Draco and Hermione's relationship develops and what it could mean for the future of Hogwarts in terms of unity among the students.
Overall, the other students' reactions would create a lot of chaos and gossip in Hogwarts. The teachers might also get involved. Professor McGonagall, for example, would probably be concerned about how this would affect the harmony between the houses. She might try to keep an eye on Harry and Draco to make sure there are no major issues. And Dumbledore? He might see it as an opportunity for a new kind of unity between students, but also be cautious as it could lead to more conflict.
One possible scenario could be that Ron is extremely nervous when he asks Hermione. He might stutter and fumble over his words, making Hermione initially think he's joking. But then he manages to get out a sincere invitation, and Hermione is pleasantly surprised.
The Yule Ball itself would be filled with awkward moments and strange looks from other students. But as they dance and talk, they might find out that they have more in common than they thought. For instance, they could both have a love for certain magical creatures or spells. This newfound connection could lead to a series of adventures together in the fanfiction, where they team up to solve a mystery or face a common enemy, breaking the traditional house barriers along the way.