I have been fisted many times, and am a member of FFA (Fist Fuckers of America) When we did a run on Fire Island, I had 2 lovers get their fist up my ass, it was awsome.
I was on my back and I could actually see and feel their fist in my gut! I have taken guys with large hand and very muscular fore arms fist me and they made me cum just by flexing those huge fore arm muscles.
Notice, keep fingernails clipped short and take your time putting youu arem into the ass. I have gone as far a an elbow on a 6'-6" bodybuilder.
It feel great, really fills you up and your asshole goes back to normal the next day. Having been fisted, I have turned into a pig of a sizequeen!! Smaller cocks work, the the bigger the cock, the more I enjoy it!!