Been there down that. Before kids my slave would be waiting at the door for me to come home, dressed in standard house dress that I had set. Other then preset days off and illness it was pretty much 24 - 7. Fun ten years with both of us being very happy.
It was tuff to balance the lifestyle and yet be a loving couple. Some nights I would pull her into my lap on my chair or on to the couch to snuggle and watch the tube. Some nights she spent finding out how many times she could come while restrained. Some nights it was all about me. Some nights we went out with her having a plug or some kind of gear on or in her to be kinknilla.
Then came the kids and as they grew our time together in the life dwindled to small bits caught when we could.
Now I am looking for that lady that can live like I did before kids and feel fufilled by it.
I would warn the sub/slave of the couple that if you have found a real Dom/Master then you maybe able to survive serving your kids but he can only stand so much of being 2-3-4 place. I know over the years I grew lonely and then angry at being the old man not the Master. Find a way to play at least on a regular basis for both of your sakes.