Two people fucking
Person 1: massive amazonian woman.(think futurama's snu-snu episode big) with a huge futa cock and balls. Massive in every way. Tits, muscles, ass, cock, all huge.

Person 2: petite little woman. Think piper perri small.

the small one is laid out, and the big one is somehow filling her with her impossibly large cock. It's so big, that it's causing the smaller girl's belly to bulge out a great deal.

The fucking part is very important. I've found a bunch of solo futa AI stuff out there. But what's good about having a huge futa cock, if it's not stuffing anyone?