Harry notices that the Weasley's plus Hermione still don't like Fleur, especially after she broke off her engagement with Bill. So, in order to try to mend bonds and show them that they can all be friends, Harry invites them all to go camping with him for a week. But Ron and Hermione have to cancel as they just got engaged and are busy. And Ginny cancels because she still doesn't like Fleur and refuses to spend any time with her, so that leaves Harry and Fleur.
Surprisingly, Fleur is still wiling to go camping with Harry, regardless of it just being the two of them(as they had originally decided for the boys to tent together and vice versa.
So they drive a few hours into the wilderness, completely alone for hundreds of kilometers
They set up their tents, camp, collect firewood and begin preparing dinner. But as they are about to eat, a freak storm appears out of nowhere and the two have to hide in the car to avoid the severe rain and wind.
And when they emerge an hour later, they find the Fleur's tent is completely gone, washed away in the freak flashflood. Along with all her supplies and clothes!
But when Harry suggests just calling it a trip and going home, Fleur just shrugs, says that she didn't have many cute clothes in there anyway and doesn't mind. She can just borrow from him, if he doesn't mind, of course. He doesn't. And when Harry realizes that her tent is completely gone, he's worried, as says as much. But she merely shrugs, saying she'll just have to bunk with him, if he doesn't mind, of course.
Harry doesn't mind, he doesn't mind one bit
Then several comedic things happen, they have romantic moments at the campfire and blushes in the tent, then things jump several steps when Fleur asks if wants to go skinny dipping
Harry agrees, of course