I have never did it either but I sure wouldn't rule it out, a black dick anyway. You can forget about a white dick cause that won't happen. To suck a black dick though, that has been inside of, and pumped black cum into, a white pussy would be the perfect way to submit to the black man. This would allow me to show my full support for Black Into White by receiving it also. A show of my respect to him and his dominance over me.
I believe the ultimate thrill would be for a black man to pound and cum in a pretty white female that I wanted to have sex with but never had and told I never would. Instead of me getting inside of her, she watches the black man get inside of her and then watches as I have to taste the black dick that has been inside of her.
Again, a statement of respect and dominance.