A year or so ago, I would have found this whole entire discussion and question disgusting and repulsive, but I guess I can see why some people may find a natural scent appealing.
For me though, it's still going to be a no. Long story short, by some manner of miracle, I somehow managed to get my coworker at work last week to slip off her shoes and socks and ended up tickling her feet. At first I didn't notice it but a few minutes in, she had a bit of a foot odor from sweat I would assume, and it definitely kinda killed the moment for me. I tried being open-minded on the issue because some foot guys swear by foot odor, but I just can't. I'm sensitive/ particular about smell, and stinky, sweaty feet is not something I enjoy.
I will say there is the occasion where my fiancee will let me tickle her feet and if I get close enough there is a very light, natural odor but it doesn't really bother me. But I wouldn't say I'm crazy about it either.
I'd prefer the feet I tickle to be scent free, though some fresh perfume or lotion scents wouldn't be bad either