One of my ex’s loved being fisted by both men or women. Had a few times in Chams where she got fisted by a couple of people in an evening, always drew an audience.
I have big hands and over the 40 years we've been together I've managed to fist my wife, properly wrist deep, once.
It takes a lot of lube, time, patience and trust.
When we managed it, she could not speak and her face was a picture extreme enjoyment