Okay, then we're settled!
I've got an idea: one of them could be a friend of a friend of the other, and one day said mutual friend decided to go camping with all his/her friends, including Edward and Louisa (who didn't know each other yet). Off they all went in their merry way, and in the second day or so (assuming they went camping for a week), Louisa accidentally incapacitated Edward by losing her balance while taking a picture from a particularly beatiful spot while standing on a slippery rock, falling down and landing on him, causing him to break an arm or a wrist or just suffer some mild injury. After that, she'd be very worried and embarrassed and would take him to the hospital, and once they were back at the camp site she would help him around since he wouldn't be in a 'fit state' (according to Louisa). Edward would forgive her, they would start going out once everyone was safely back in their homes, and after a year or so of dating (in today's society everything seems to be done so quickly), they'd get married. Ta-dah!
Feel free to change things, criticise, applause, or come up with something else entirely lol :P
Edited because I can't spell :/
This message was edited 12/7/2009, 3:14 PM