You know, you are exactly right. They both should be cleaned up.
I would hope the black guy would want both also. After all that would be two feathers in his hat, instead of just one. Then he could see us having to go to the white pussy that we can't have, and get the black cum from it that he delivered.
Then he gets to watch us have to go to the black dick that is getting that white pussy and work to taste the wet slickness that came from deep inside the white pussy that we have to wonder what it feels like in there and he could tell us what it felt like. But he wouldn't, he would rather we keep wondering and wishing we knew.