I have been with a few large women in my day. One was a beer goggles moment the other a dare from my friends. LOL. It actually was not all that bad, both kind of smelled some though, I guess from the sweat in their folds. I did not go down on either in fear I would not come back. Positions that worked were missionary and with one of them she had to lift her belly up to get to her bits. The other one I just bent her over and went to town. This was not bad, lights were out, and I could not feel anything with my hands.
I will say that both gave good head though.
The old joke...when doin a fatty...roll them in flour to find the wet spots. Just kidding...even over weight women need luvin too.