Penis sleeve

Sure. How about something like this?

https://amzn.to/40FkUue

If that doesn't work, he can always wear a strap-on. The added benefit to that his cage doesn't need to be unlocked.

Posted by: @djlewis11

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My husband penis is small and we’re trying to find a penis sleeve that will work. Any suggestions.

I think I know what you might be getting at.
We think of ourselves as quite knowledgeable on this subject, we love them and had a good collection however covid lockdown had that collection grow and get plenty of use.
My husbands penis is small and pretty thin and after he bought a few that were from ho hum to okay he said I should buy one and surprise him.
I did and it was well large, particularly the girth.
His thin erection just did not fill inside and it is funny that I'm sure he was more disappointed than I was.
It took him less than a day to find a solution, an earlier purchase that was like a very thick condom with a solid hard head.
He cut the head off and used the tube, no lubricant and slowly roll the larger one on then be the man I need!

One last tip * It really is worth spending the money, after a really good year he bought me Vixen Colossus for xmas... AMAZING!