I fisted my first sub last night.  She is a Big Beautiful Woman (BBW), overweight obviously but so willing and eager to please.  After lots of foreplay, her pussy was as slick and juicy as could be.  I inserted three fingers EASILY....and then 4 and said to myself - "What the hell" and curled my thumb in and made a fist and eased it in.  

I fisted her twice in between fucking her. The first time, my fist was about 4/5's in. The second time, past my wrist. She came twice while I licked her clit with my fist in her cunt.

 My cock was rock hard as I was so turned on to be fisting a cunt.  I had no room to move my hand inside her pussy. It was tight inside but I pistoned and rotated my fist as best I could.  

She will be sore today I imagine.