Well, I had my foot kissed slightly once by a partner, and really enjoyed it. My new guy has a bit of a foot fetish, and he kissed my feet while we were fooling around a bit. I wanted him to go farther, but I don't really know how to broach the subject again, since apparently his desire for feet waxes and wanes.
I also had my toes sucked as a teen, but it was kind of awful for me. I had showed up to a friend's Sweet 16 wearing toe socks, and all of us had taken our shoes off. A boy who I only vaguely knew got dared to suck my toes through my socks during Truth or Dare... and though it did really feel good objectively, it made me intensely uncomfortable, because I've always been really twitchy about people touching me.