WestCoastBull:
...but I want it to be as much fun for her as it is for him...
Wanting everyone to enjoy is the golden rule in this game. So you're going in the right direction.
To guess the desires of a cuckold is as difficult as guessing the tastes and desires of anyone. So your best tool is communication. Talk to the cuckold, let him be your friend. Let him know you are interested in everyone to enjoy, including him. Ask him to talk his tastes and fantasies. This way you can know what kind of things he enjoys. It will be easier to achieve your goal the happy day.
It's obvious that English is not my native language. Sorry for any inconvenience. My blog (spanish): http://keratafilia.blogspot.com