Luna and Harry, please.

Yes, the Muggle world is a good idea, in my mind. Perhaps we may start a few months after the final battle and have Hermione convince Harry to clean up his remaining link with his relatives after he's been feeling lost as to where his life should go? And since both of their relationship with the two youngest Weasley didn't work and they grey close to Luna, the two blonds could meet that way later on.