"do you think bbc man prove his domination over husbands by fucking their wives ?"
my wife's first black guy was an older fellow (he was in his 40s and us in our early 30s) we ran into while out dancing and drinking at a singles club. (we were married but they had a hot, live dance band) in short he really was likeable, they hit it off, and we had fantasized about this happening.

He ended up sitting with us and dancing with her a lot as we drank far too much. After the bar closed we went to his pad and continued partying until he slowly stripped her bare and then mounted and took her there in front of me.

Although I was shook up quite a bit with the reality of seeing another man throughly driving her insane with lust my dick got hard and at some point it was too much and I started stroking off. It was there and then that he began to point out our size differences, ask her if she preferred his big black cock, and in general show his dominance over me through her replies. We ended up going back to him many times as his ability and technique was awesome and had hooked her to this wild, unbridled kind of sex. The longer we did the more he delighted in putting me down, with his actions and remarks so in his case I would say it's a definite yes to your question.
Her second steady was a married black guy a bit older again, and was a bit dominate but not like the first, letting his stamina, dick size, and technique do the talking. They hit it off on a physical and mental level and he owned her in any ways.
At one point we were staying at a downtown motel after seeing Steady number two and I was in the DC chat room with an Orlando guy, who we'd already met at Dennys for an intial intro. She was lying there half asleep when I told her he wanted to come over and she said fine! He was quite tall, the tallest we've met and his pics showed a very well hung guy. In short he did come over and soon had her aroused again and in no time was driving her to multiple orgasms. He was huge and delighted in teasing her with his cock until she'd beg for it and then he'd ask her if she wanted it or my dick? Even had me come over and had her hold us both then decide. Of course she wanted his and that was what he wanted fro her. Again pretty dominating behavior.
As for I' not a sissy, but rather an average looking guy with an average dick, but soehow got hooked on seeing black men take my wife.. Strange but true!