They'd actually get along pretty well. Fleur probably would've met you first at the Triwizard Tournament at Hogwarts. You became friends with her and some of the other students from the Beauxbatons Academy even though some of them seemed like complete snobs and kept bad mouthing Hogwarts

You most likely would've become her friend after the first challenge. She seemed pretty shaken up after facing the Welsh Green Dragon. You though she'd done really well and you went to congratulate her. Very few people congratulated her after her task from Hogwarts and you happened to be one of them. Needless to say, you'd managed to catch her interest

You started hanging out with her more often and she told you a lot about her sister. You already knew she was a quarter Veela since she'd told you. Now, fast forward to the time the Yule Ball took place (I wish I could go to the Yule Ball 😔). Fleur wanted you to go with her but you'd decided to go with another Gryffindor much to her sadness and disappointment but no worries, she was going to get you back no matter what

But her plans had to be put on hold after the second task was announced. Fleur couldn't save her sister Gabrielle after she got taken underwater by the Merfolk. She'd managed to use the Bubble head charm against the Grindylows but she didn't save her sister yet. She felt like the most useless person on the planet till you came along and comforted her. Oh, and how grateful she was for your comfort. She started crying onto your chest while you patted her head gently telling her that her sister would be all right. You even offered to swim in the lake to find her and get her back but as much as Fleur appreciated and admired your courage, she didn't want you to get involved with such dangerous creatures. She was scared of what they might do to you

After Harry got Gabrielle back, you started hustling and bustling around to get them towels and you placed a hand on Gabrielle and asked her if she was all right. It was literally love at first sight for the younger one. She nodded and Fleur could sense that her sister had started having a crush on you. She was amused and kinda annoyed at the same time. Both of them however realized that they needed to work together when they saw you tending to Cedric and Harry. Their jealousy literally sparked up through the roof and they felt the urge and the need to make you theirs. You would become theirs eventually soon after the tournament was done

I'm sorry, I have a hard time writing for Fleur TvT