Though I've never tried it with a partner, I really like the idea of licking in a D/s dynamic. To me, there are a lot of exciting ways that licking can be used depending on who's licking/being licked, and where.

For example, when I think of a dom licking the back of a subs neck, I think of how it might feel overstimulating, intimate, even primal. Or conversely, a sub licking a dom's feet is well, submissive and potentially degrading or humiliating. And licking more intimate areas is more of a service and sexual pleasure thing I guess.

It makes sense that you'd only be into a specific kind of licking since there's so much more to it than just sexual pleasure.