cuckold/voyuerism fantasy

I know there have been similar posts in the past about this topic, but I'm interested to find out if any of you ladies have considered it or are currently in this type of relationship. My hubby and I have been married for 5yrs and have 2 kids. I have always know about my hubbies fantasy of watching me with another man, not necessarily humiliating him as in a cuckold relationship. We have spoken about it and I've played out scenes for him which he loved and I enjoyed it too. We have a healthy sex life and I have given it much thought and want to give him his fantasy. Any ideas on how I can go about this?