Found this article giving advice to a man with a submissive. The column is a regular sex advice column but this one is more kink friendly.
My question is on dom/sub slave etiquette. Assuming that things with this new woman work out, at what point should I break up with my sub? Should I tell her about the other woman? Should I tell her in advance we are ending (“Your next visit will be our last”), or should I just ask her to come over and break up then (“We both knew this was only going to last so long”)? Do I help her find a new dom? This isn’t a regular breakup, so I’m not really sure how to do it. My sub loves to serve, so would it be cheating on my next girlfriend if I let her keep doing domestic tasks for me, but nothing sexual? Should I tell my next girlfriend that I had a sex slave for a while? —Deciding On Method
The House of Void 
Jack Rinella puts out a weekly leather column you can subscribe to online (he’s also written a couple of books).
You can check it out at: http://www.leatherviews.com/freezine.htm