I would not mind someone smaller than me at all. As long as they did not mind my belly. If they were bigger that is ok. It is more for me to play with. Either way would be ok if they accepted me.
My fat wife has always been happy with me as a weight-lifting muscle type in the past. But now I am gaining, she seems to be just as happy with my new shape, thankfully....
personally I have no other option but the fat/skinny cuz I'm not a feedee nor am I particularly fat ... but I like contrast and having different "roles" when it comes to this fetish