Everyone is different but IMO it is just one of the steps towards total dominance of a black man over a white woman. It seems to be especially acute when the woman is the white wife of a white husband. Fucking a white wife's ass is another way to establish total dominance over both the husband and wife.
What I find interesting is how the wife goes along with it even when they are not into anal. Back when I was sharing my wife with black men, the first thing they wanted to do was fuck her bareback, shooting their seed inside her willing pussy. It didn't take long though for them to try and fuck her shapely white ass. I know for a fact that Amie is not really into anal and for the first several years of our marriage she refused me when I suggested it. I was floored the first time I shared her when she willingly submitted to their desire to screw her ass. When I asked her about it afterwards she told me she has a problem saying no to her black lovers. She is indeed is very submissive when it comes to black men.
The young blonde woman in the first picture I am posting was not into anal but she agreed to let it happen. Once it was the moment of truth, all she could do was hang on for dear life and try to enjoy it until he finished.
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