Some people have a thing with shoes. They make their sub lick their shoes.
That is fine if you both like it, but I simply don’t. I don’t get a kick out of humiliating someone, and it really doesn’t make me feel. And she gets nothing out of it except a dirty tongue (and she already has one, oh God I’m so predictable). No.
It’s not my thing. Licking your bare feet (if they are clean) sometimes feels nice, but no.
I’d rather use her tongue for something else.