fisting?

can anyone get their guys or thier own hand all the way in your vagina? if so how long did it take to get it all the way in? my guys hands are so big and all I want is to feel how it would all in there. Seems like it would be amazing to be so filled up. and if you can get your own hand in. how in the world do you sit or lay to do it? ... forgot to mention he has gotten all5 fingers in we're having problems getting past the bottom half of his thumb. it was painful on my pelvic bone. so I'm pretty sure him getting all the way in there is never going to happen. we used lots of lube. I'm wondering if I have him put a glove on if it'll help make him slide in easier. I'm tiny so it took a long time for that to even happen. I have heard of stretching by having your guy try everyday. but I don't know how true that is since you naturally go back to size. we have only tried 2 times. once when I was preggo and was at that part of my pregnancy where i was horny all the time. and one time way after I had them about when the were 2 years old.

Update.... We have recently got a fist toy and it's awesome. But we still want to try to get him in. So after some time of using the toy we are going to switch to him after he pulls the toy out and see if he can slide in.