I meant finding a substitute task, not a substitute slave. We are nowhere near ready to experiment with a 3rd person. The way I had this figured is that the letter would give me the opportunity to see from her perspective what the role of a slave is.
Our goal is to push the limits so surely I will ask of her things that are not included on the list, knowing that refusing will bring a punishment I expect that it will help accomplish this. It will also help me to find the hard limits from tasks that she will prefer to refuse. The hard part will be finding a punishment that is motivating but not so cruel that it ruins the game.
We are living together but it's not a true 24x7 arrangement since we have kids.