I just love the concept behind this!
You can tell your husband he gets to fuck you, then you encase his little dick in this thing and tell him to get to it. He does all the work, getting tired and sweaty but receiving no pleasure from it, meanwhile you experience plenty of pleasure from being stretched and filled.
Then when you're done you push him off and expect him to thank you for letting him fuck you, when when all he's done is get you off and wear himself out!