Those are occasionally my first words when I notice that a slave is turned on by a beautiful pair of boots. I will wear them, and you will be allowed to lick them. Yes, usually it's a matter of 'allowing', because it's a favor from me to you.
Or it could just as easily be a humiliating task, for example because I think that they're a bit dirty and you, my slave, will have to clean them. And not with a cloth this time, but with your tongue. Until they're absolutely spotless.
If I can still find a speck of dirt on them, you can be sure that you'll feel the consequence