Use your hands and mouth to get him to the edge of orgasm - and then pull back before he gets to come. I do try to avoid this. A bit of playful teasing such as "You couldn't even make it to the bed without my help" and similar statements are a good addition at this point. Good Mistresses take a great deal of pride in their work. Once you can offer references, this will be much easier to figure out. Second, for the ease of reading, these scripts will assume a female dominant and a male submissive. Do you want to be controlled?
I always have a quick chat with clients before the session to refresh my memory on their interests and allow them to elaborate if necessary.
The Mistress and her Maid, the very first time
Not confirming is not the same as canceling. Feel free to push and turn his body as necessary to make it to the end goal. I love it when clients compliment my skills after a session and tell me what parts they enjoyed the most. I watch it too. I always have a quick chat with clients before the session to refresh my memory on their interests and allow them to elaborate if necessary. Move into intercourse if you'd like.