LOL, you sound just like my wife. Like you, she thinks being in the middle is amazing. As for your hubby, take your time and just let him know it is double the fun for you and you are more then willing to return the favor for him. He will catch on to the idea I am sure. The big thing is dont push it, it is meant to be fun and if he feels like it is being pushed on him, he will not be as willing. I would also suggest some adult movies that are geared towards the type of play you want. Watch with him and see how he reacts.
Good luck and the key to everyone having a great time is communication.. !