You can't predict.

With Kako's swollen belly inside of you, your own swollen middle juts out past your knees and completely covers even your own thick thighs as you squat over her. Your large rump rests to either side of her torso after its recent workout. You bounce on your big butt, trying to get the outline of Kako's fat cock in your belly to make outlines of it shooting cum.
"Cum, Kako...?"
"You sure you don't want it on your tits instead? I can make it so your chin always rests on them, even while you are standing and not even looking down!"
"Hmm..."