It is important to clearly define your D/s role for a healthy BDSM relationship, you must have a consensual, and trusting relationship that is formed from the beginning and goals defined. As a new submissive explores this type of relationship. The sub will be expected to schedule time with their Mistress and go through appropriate screening measures expected from the Professional Dominatrix. Each Mistress may have a way of screening and taking sessions that is different from one another. Respect their individual ways of doing this.
Personally, I do not take clients who do not so