You just posted a thread (with almost the exact wording!) just a couple of months ago. http://nameberry.com/nametalk/thread...per-and-Aubrey
It had over 20 responses. Out of curiosity, why are you posting it again? I doubt you'll get different answers this time around.
I find both feminine.
I thought they were girls' names from the heading...
Although personally I think that Harper and Aubrey are names more suitable for boys, they are both pretty high up on the girls popularity list (in the US at least). I don't like Harper at all for any gender but Aubrey Nathaniel is a handsome combo. I think Harper and Aubrey would make a good sibling duo but most people would probably mistake them for girls if they weren't aware of their mn's.
If you want your boys to be teased, then go ahead. They may be traditionally boy, but are now used primarily for girls. I would not do it.