trying to get my gf black fucked!!

ive been with my gf for 3 years now and im trying to get her fucked by bbc...i know she loves black men and finds them very sexy...she had bbc b4 i met her also. I almost convinced her to come out with me to the bar wearing a very short and sexy dress with no underwear on, but she backed out. i feel like she wants bbc but is afraid to show me her desire for it. I need some help trying to convince her and also help coming out and telling her that i want her to be black fucked...please i wouldmlove all of ur insights..