My husband wants anal play

My husband said, he’s been experimenting with fingering his butthole. This is all fine and dandy, and kinda excites me! Partially because I want a m/m/f threesome one day, which I know, I know, anal play doesn’t mean he’ll get comfortable enough for that to be with... well... a man. Almost ran out to buy allll the lube haha!

But as he sprung the info of he’s been experimenting with that, he asked if I would.

I rubbed it instead for that moment, mostly cus I was in shock.

And I DO, want to finger his butthole, That’s no issue. I know the sensory would make him cum a lot faster even. I’m not uncomfortable with that aspect, and I’m not worried about his sexuality like some women apparently get,

But I have anxiety. And messes and feces and germs... make me very not okay.

So even after rubbing there, I spent 10 minutes washing my hands, and still feel dirty kinda.

How do I participate in something we both want to try without feeling... that traumatized and obsessive?

I know I could use a toy but I think both of us wanted to start with a finger.

Do they make like... finger condoms?

Or is this just hopeless?

Edit: I can’t use a glove because I haven’t found one that doesn’t have 2-3 inches of extra glove past my finger i have really really small hands