Hi Seven! I'm Kat and I don't think I know you so an extra hello back! :D
I don't think I have anyone directly involve with Aurore, though Rabastan Lestrange (this journal) is probably loosely related to her in a few ways given he's a pureblood.
Oliver Wood (givemewings) and Theodore Nott (perfectfacade) would know who Fleur is due to the Triwizard Tournament and Oliver might have known Bill a bit, though I haven't quite worked out years there.
And Aiden Warrington (photofan) was about 4 or 5 years ahead of Aurore but he's something of a serial dater so I can offer him up as a potential boyfriend or an ex.