Queen Naomi and Mistress UV,
I had the privilege of being a "training" slave four times over the years in sessions. The Mistresses in each case were training women who wanted to learn the trade and work at each dungeon. I felt complimented that I was selected and usually I had some one-on-one time with the head Mistress after the training session. I always thought that how it was done, but the last time I was a training slave was at least a couple of decades ago.

In one unique case I asked a Mistress for advice on a unique proposal. I was a regular with an out of town Mistress for several years and was in deep sub-space. We saw each other at least a couple of times a year. She produced her own videos and wanted me to be in one of them. I was tremendously complimented, horny... and frightened to be outed all at the same time. She said I could wear a mask and told me to think about it since I wouldn't see her for a couple of months.

Luckily a week or two after the invitation a Mistress came to town that I knew and did her own videos. I called for a session and I told her about the offer and asked for advice. She gave me a list of legal questions to ask, and other issues. The bottom line is that I respectfully declined to be in the video and it didn't harm our working relationship.

As in anything in life, ask for advice and do your research.