Cuckold him while you have him caged. In fact, the first time you cuckold him, you will probably WANT to have him caged.
You can have sex with your lover on top of the cage/massage bed while he’s in it, or simply on the bed while he can’t see what you are up from his cage on the floor. You can also point the cage right at you and lock him in a position where he’s forced to watch as you have the most incredible pleasure fucking someone else in front of him.
You can also finish things off by making him give you oral pleasure afterwards tasting the wet juices dripping from your pussy, or you can have him finish the guy off by forcing him bi and making him suck your lover’s cock.
So many options!