In my book Dominatrix on Trial I spoke about the many scenes the clients requested. Often they would put their requests in writing. Another excerpt from another letter.
Dear Headmistress. Thank you for seeing me on such short notice. My name is Slave Bob and it is an honour and a privilege for me to serve you. I have been a submissive for approximately 25 years. I am very submissive and I enjoy being treated and trained as a slave. In an effort to be helpful so you will enjoy our time together I have detailed below my likes and dislikes and limitations: tight bondage, strict discipline, humiliation, (especially in front of others), maid service, animal training, nipple clamps.