Step 1:
The very FIRST thing you must do is to absolutely make sure she KNOWS you love her. You don't do that by just saying "Hey, I love you, now how about becoming a black cock slut." That is not going to work. SHOW her you love her, not just tell her. Do things for her that truly demonstrates you care about her and her well being and her emotions and her sexual pleasure.
You do that by bringing her flowers frequently; writing her a little love note; going on-line and copying a love poem (be sure you don't represent that you wrote it, just that you found it and thought it fitting for her); getting her a gift card for a dress shop that has sexy clothes, etc.; doing things around the house for her that maybe you normally don't do; taking her out for romantic candlelit dinners. Anything like that will SHOW her you love her, and throughout this whole process, KEEP doing it. Don't just do it once or twice, then not again. Every step along the way, SHOW her so that she knows the things you are doing are out of love for HER, not because of your own needs. It must be for HER, and she must always feel that. Once she gets the idea you are doing it for YOU, it becomes more difficult by far.
Step 1 must become continued throughout this whole process, not just at the beginning, even though this is the only place it is mentioned. This is critical. Never forget doing this.
Step 2:
Attempt to keep, as much as you can, your white dick out of her pussy. Oh, I know, that can be difficult for you at first, as you will get very horny, but why do you think God gave you a right hand? Use it to relieve yourself when you need to. For HER, eat her, suck her tits, kiss her lips, play with her asshole (fingers and tongue), and all that, and get her to cum from those things and NOT from your white dickie. When she cums from the things you do to her like that, she needs to feel good about it, but also she needs to feel a little wanting, wanting more, not being completely fulfilled, like she is missing something. Really explore her body with your mouth and tongue and make her hot and wanting more, and make her cum, but not really hard. Remember, she must always be left wanting something more that you cannot give her.
Step 3:
Start getting her into nudity. Get her naked as often as you can. Let her know you love watching her cook naked. You love her watching TV naked. Give her naked back rubs, massage her feet, with you sitting on the floor, her totally naked, and once in awhile, remark on how beautiful her pussy is. Throw in some sly comments about her having such a sweet body and pussy, and she should not be concealed. She is meant to be enjoyed by others, too.
Step 4:
Whether she is into or not, watch Inter-Racial (IR) videos with her. She may not initially like it, but DO IT regardless. Don't back down on it. She may think you a pervert at first, but keep at it. The first few videos must have ONLY one black guy with a white woman, and try to get ones where the girl looks something like your girl. If she is blonde, have the girl in the porn also blonde, etc. Throw away ANY porn you have that have any white guys in it. While watching the IR porn, play with her, finger her, twist her nipples, kiss, whatever you have to do to get her hot WHILE watching the IR porn, but remember, really try to keep your white dickie out of her, and make her cum only from watching the porn and the things you do to her that don't involve your dick.
While watching, make some comments about how hot it is to see BLACK cock in white pussy, how much of a turn-on it is to see that beautiful contrast of black and white. After the first few times, make comments about how white girls really need black cocks to truly be sexually satisfied and sexually liberated and free.
Step 5:
Get her a very realistic black dildo, preferably one that vibrates. Don't make it too large for her, and don't make it blue or red or gray or whatever, ONLY BLACK. It must be realistic looking, with veins and a nice head. Start using it on her while watching IR porn. Eventually, get her to take over control of the dildo. Get her to cum from it while watching the porn. Make comments about how beautiful the dildo looks in her, how black is so good for her.
By the way, be sure to get some good lube for the dildo, and be sure to not only keep it lubed for her, but also keep it clean for her. After use, use some soapy water to clean it. YOU do that, not her. And YOU apply the lube, not her. K-Y has some nice lubes, and you can get it at any drug store, such as in Target, Wal-Mart, Walgreens, CVS, etc.
Step 6:
Work on her becoming a total nudist at home. Anytime she is home, try to get her naked, and used to being naked around you and other family member that live with you. Become a nudist family, if possible, but at the very minimum, get her to be comfortable with being a nudist at home.
Step 7:
Get additional IR porn, only now, with more black guys and one girl, or with several girls and one or two black guys. Don't make it full blown gangbangs yet, but after she is very used to it and comfortable with several guys and one girl or several girls and one or two black guys, then graduate to gang bangs if her interests seem to lie in that direction. Adapt to what seems to turn her on. If she gets turned on by the thug type, make sure there are some like that in the videos. If she is turned on by guys with dreads or shaved heads or big balls or six packs or whatever, make sure there are guys in the videos like that.
Step 8:
If you have followed the first 7 steps, and she seems at least somewhat responsive, you need to start pushing the envelope some. Buy her really sexy and revealing clothing now, and encourage her to wear them. At home at first, then out in public. She will likely resist, so offer to take her to another town or to a place she won't run into anyone she knows when you go to bars or clubs or out shopping with her dressed so sexy. Get her used to the idea of looking and acting sexy.
Step 9:
When she is used to looking and acting sexy, then get her to go without panties while wearing a short skirt. Going commando really heightens a girl’s sexual awareness, and very often gets her aroused and makes her bolder, once she is used to it. Going commando will truly change her attitude when she is out and about. At first, when she does this, it will be very hard for her to get her mind off the fact she is in a very short skirt with no panties, and the possibility total strangers could see her. Work that around so that it is a total arousal for her. Play on it.
Step 10:
You must now go hot and heavy with the IR porn. Ensure she NEVER cums unless she is either watching a black cock in a white pussy, or that she cums with the black dildo/vibrator. In other words, ANYTIME she cums at this point, it must, some how, some way, be related to black cock. She must begin to fully associate black cock to her own sexual pleasure and release, and if black cock isn't involved some how, then there isn't any sexual pleasure and relief for her at all. Above all, you must now, no matter how hard it is for you, keep your white dick out of ANY of her holes.
Step 11:
Go to a club or bar or SOMEPLACE (you find it) where you know there are some black guys. Get her to dress sexy and without panties. Buy her a few drinks (don't get her *****!!), and get her to dance with some black guys. Just sit back and watch. Don't interfere or push her if she is truly reluctant. Let it come more naturally. If she is sort of willing, but too shy to take any action, then YOU must ask a black guy to dance with her, or share a drink with her, or whatever seems right and appropriate at the place you are at. Get her COMFORTABLE with being close to black guys while she is in a very short skirt and no panties.
Step 12:
Usually, if she is willing at all, it will happen by Step 11. While dancing, the black guys will feel her up, squeeze her ass, etc., and she will then begin to submit. If she has gone through Step 11 but has not submitted to them yet, but does seem even somewhat receptive, then you need to push it harder. Tell her you have arranged a date for her, or set up a meet in a motel, or invited a black friend over, so that she can get even more comfortable with the idea of being very close to black guys. If she has does not seem receptive to submitting, you need to repeat some of the steps. How far back to go depends on you and on her reactions.
Step 13:
If she has gone all the way through Step 12, and has actually dated or met but has not fucked yet, then it is time to come out with it. Tell her you worship her, and you believe she NEEDS the sexual satisfaction of fucking black, and you encourage her to do so, and that you are 100% ok with it. It may now be time to set up an actual fuck meet for her. Let her know you will participate only to the extent SHE wants you to. If she wants you to watch, great. If she wants you to just be nearby for security at first, do it, and do not insist you watch. If she wants you for clean-up after, do not hesitate, not matter how you feel about that at first. You do what SHE wants, not what you want. It is all about HER, and always keep that at the front of your mind. She is primary, you are not.