Facesitting, also known as Queening, is to sit on another person's face. Now usually it is done with the submissive being force to clean the pussy or the ass. However, I have set on John's face many times with panties on and not allow him to take his tongue out of his mouth. John finds this to be excruciating, to have the smell, the aroma in your face and not be allowed to taste it.  I also use this as a form of smothering.

Facesitting is common among dominant and submissive individuals, for demonstrating superiority and for sexual gratification. The person sat upon may be in bondage, sexually submissive, or simply held down by the body-weight of the other person.

Queening stool

A queening stool is a low seat which fits over the submissive's face and contains an opening to allow oral-genital and/or oral-anal stimulation of the domme while seated. The queening stool is also related to a "smotherbox," which also allows the person under the seat to be locked in place, restrained by the neck as in a set of stocks.