A queening chair is a low chair or seat that can be placed over a person's face to allow for oral stimulation of the vagina or anus. The seats of these chairs are usually U-shaped, and are designed for the receiver to perch with their legs on either side of the U and her buttocks on the back of the U. These chairs are usually built with comfort in mind, and the seat of a queening chair is usually padded and there is a support just under the chair for the person on the bottom to rest their head on.
An example of a Queening Chair:
More About Queening Chair
Queening chairs are used during acts of queening, a sexual practice that involves a dominant person sitting over a submissive partner's face. This practice is common in femdom relationships and can be used by someone to assert their dominance or humiliate their submissive.
Queening can also, however, be used purely for sexual satisfaction and vanilla couples shouldn't dismiss it. Using a queening chair is often a more comfortable way to give and receive oral sex - and can help prevent smothering. When someone sits on a queening chair, it's easier to relax the pelvic muscles which can expose more delicate and sensitive areas of the labia.
Queening chairs can also be used for rimming. As the seated position naturally spreads the cheeks, queening chairs can be extremely helpful for providing access to the entrance, hands-free.