Edging
When a person is brought to the edge of an orgasm without being allowed to climax. Often a dominant can use edging with a submissive as a form of torture, controlling their orgasms by bringing them close and not allowing release.
As a dominatrix, I enjoy controlling the orgasms of my subs, and I find edging to be a useful tool of torture in this area. However, I find sessions where edging is the main interest to be extremely boring so expect me to not respond to such requests. Note that I also do not offer sexual services in pro-sessions.