Pleasure with a packer

Hi ! I'm not trans, but my boyfriend is. Of course I have absolutely zero problem with that, but I need some advice.

He recently bought a packer that can be used for sex, and we've had sex using it and it was honestly amazing, but when we talked about it he told me that what felt best for him was the fact that he gave me pleasure, and the sight of me using it.

As much as this is great, I was wondering if there was a way to make him feel even better with it. I know from what he told me that not feeling much down there when using a packer can be kind of dysphoria-provoking, and I really really would like him to enjoy himself as much as I do.

We thought about putting a very small bullet vibratory (he has one) between his packer and his privates but it seemed a little complicated, and I can't think of any other way.

Any tips ? Thank you !!