Yes, this is the best way to get sperm deep into fat sow cunt. I only fuck desperate fat sows and my goal is to impregnate them, so I try to fuck them in this position. Even if I promise I'll use a condom, I don't. When they're on their fat belly like this, they can't stop me even if they realize I'm in them raw. Thing is, most of them start fucking a LOT harder once they understand how badly I need to pump my sperm into their womb. The fatter and more ugly they are, the harder they fuck.
https://www.youtube.com/watch?v=fKdx-TifZ04&t=107s