In our case, Axel (my wife's ex black boyfriend) had not a bigger penis than me. Nor his cock was small.
His real talent was in his great sexual experiences and his self confidence.
My cock is 17 centimeters long and it's quite fat. My wife loves it. Despite it's not small I have had some problems trying to make my wife cum in some positions.
One of the last times we dated with Axel, my wife and me had been fucking in doggy for almost half an hour. I couldn't make her finish. I don't know why but doggy is not my best position. During more than 15 years of marriage, we have just fucked in doggy 5 times.
Axel and Susie had already fucked in standing doggy before, but they had not fucked in four legs doggy. I told Susie that I was going to ask Axel to fuck her in doggy later.
Axel came at home some hours later. I told him that we had been fucking before and I had not been able to make her finish, so I asked him to fuck Susie in doggy over our bed.
I think that the simple idea of fuck with Susie in the same position with wich I had failed, some hour before, turned Axel on immediately.
When he unzipped his jean, his cock was already hard. However Susie sucked his black cock because she liked to do it.
Axel behaved like an excellent lover that day. Even when he was ready to fuck and Susie was in four legs, over our bed, waiting for his cock, he boasted saying "here comes the black dick".
https://www.blacktowhite.net/media/fucking-in-doggy.23017/
He didn't need a huge dick to make Susie reach an orgasm just in a pair of minutes. His great sexual experience and the fact he was black (Susie always felt attraction by black men) were enought.
I should have asked him to cum over my face that time!