If you're that big (I'm also as much) maybe it's better that she can't take more than 3 fingers. But!!! I fisted my ex quite often, and after every fisting, believe it or not, she was even more tighter than before fisting. I guess when she explodes in these mind-blowing orgasms she had, her pussy gets swollen or something and she was tight for me to fuck her comfortably. She said she felt everything. Idk if she lied, but judging by her moaning and shivering, she must have been an amazing actress, if she was only pretending. Plus, I seen her after every fisting, she was barely able to stay on her feet.