bwhite:
Any ideas to make her go black???
If you're really her "Master" and she's your "slave" then you're approaching it from a BDSM angle, and you're supposed to have a list of hard limits. If interracial isn't one of her limits, then you don't need anyone's advice and you don't need to coax her. Just tell her do it, and she will.
However, if "Master/slave" is just a cutesy game then that's different. First of all you should never "make" anyone do anything. If you look at it that way you're approaching it wrong.
Most women want to please their man. Work with that. Get her to want to do it because it pleases you. Start by being honest. Explain to her that you find it arousing. Let her know it's important to you. She may have hangups about it, and you'll need to be patient and help her get over those gradually.
Watching interracial videos together is a good start. Be sure to get ones that are female friendly, with a plot, a nice looking, well hung black guy playing with a couple, etc. DO NOT get the hard core 10-guy thug-type, black gangbang vids (most women don't care for those at all!). Also get her a realistic black dildo, to get her used to the sight of being penetrated by a black 'penis'.
It may take months of watching vids, talking about the scenes with some dildo play and tons of fantasizing together before she'll agree to try it. So be very patient, and NEVER get pushy or demanding or argue about it. If you do that you'll set things back very quickly. Remember... move at her pace.
cuckold - Pronunciation - kuk-uhld - noun 1) The husband of an unfaithful wife. 2) A husband whose wife has sex with others. NOTE - It does NOT say: Sexually confused, submissive, humiliated, sissified, crossdresser, cocksucker, or piss drinker