Interesting perspective Meg. Thanks for sharing.
It is a not so well-known fact that a majority of men, and white men in particular, are experiencing lustful pleasure from the thought of their Woman being intimate with another man, and especially when the other man is Black. But in order to create that pleasure, however, it is essential that there already is a connection between him and that Woman. So, even i prefer honesty, i'd suggest you build up a connection with him first. Otherwise he may be open to the idea of watching you having sex with a Black man, but perhaps consider your type of relationship a purely sexual or kinky one, which is not what you are looking for, if i haven't misread your post.
The other problem is that even if he may be aroused by the thought of you with another man and Black men in particular, that arousal potentially involves mixed feelings, and it is possible that the negative ones overweigh, or he keeps it a fantasy but will be too fearful or insecure of actually going through with it. i'd say, it would be wise to first create a romantic and sexual connection with him in a way that he believes in the possibility of a long term romantic relationship with you. Make sure he feels secure within the connection you will have established because it is crucial that he trusts that you will not run off with a potential Black sex partner. Introduce the idea and imagery of you with a Black man step by step and with small steps instead of jumping right into it, so that he gets enough time for his thought process to adjust to any new idea. There are a few easy ways to do so...
Talk about your own sexual past and previous relationships and/or flings. Tell him that you hardly ever had dated white men before, and if he truly is interested in you, he will query you about that, and you can become more specific about your (sexual!) interest in Black men. Also tell him that you have had a very playful sexual past including a period where you had many lovers and sometimes even more than one at a time. Say that you have just recently noticed a strong increase in your libido. Be authentic! Don't invent events or experiences that are far off and don't reflect your real life and past. Lying is not a good idea to start off a relationship that should be built on trust.
When you have him over with the intention of having sex with him (among doing other romantic stuff
but not the first or second time you have sex with him), make sure to keep a black dick dildo with a realistic look-and-feel laying around in or near your bed so that he will notice it. So if you don't have one yet, purchase one!
And give it a Black-sounding male name that you will use whenever you're referring to it.
Perhaps he will start using it on you even without being asked or told. Otherwise, use it yourself as part of your foreplay while he has a good view of the action, or tell him to use it on you, and don't hide the sensational pleasure you experience from the realistic black dick dildo. Also make sure that it is obvious the stimulation from that dildo gets you in ******* more easily than usually from his white penis. Also guide and pull his head and mouth down to your vulva frequently so he knows you like being eaten out by him a lot.
Each time you watch a movie together where there is a Black man + white Woman couple in a scene in some sort of sexual context take his hand and lead it to your crotch, suggesting you have become horny from watching that scene and asking for being stimulated and/or for relief while you keep your eyes pinned to the screen rather than him.
Suggest a threesome or other sexual fantasies of yours or a "bucket list for sex" - things you haven't done yet, but would love to. But tell him straight away that you are not going to accept him having sexual contact with another Woman! Provide a positive explanation and reason for that, like you love him so much that you would become jealous and simply couldn't handle seeing him with another Woman. Make him a part in all those fantasies, if not an active one then a passive / voyeuristic.
If you are bisexual and he insists that if you would invite another man for a threesome, for fairness there has to be a time where you invite another Woman too, then tell him okay but in that instance there will be no physical contact between him and the other Woman, which will also invite the idea of him watching you with another person. A successive step could then be to introduce the thought of him watching you with a Black man instead of a Woman and the MFm threesome.
Also prefer to invite a Black Woman so he will get intreagued and used to your playing with a Black person and the eroticism of Black-to-white skin contrast.
Start using porn as a source of your conjoint pleasure, i.e. visit a porn tube site and watch porn together during your sexual playtime. Make sure that you are the one who selects a scene more often than him and that most (but not all) scenes you select contain Black man/men on white Woman "interracial" sex.
Never use pressure on him, see how he warms up and give him time to adjust to new ideas and suggestions provided by you. Start with small steps and "push the boundaries" carefully and step by step. Don't let sexual fantasies govern your everyday life but focus on all aspects of life and building up a good relationship.
One last thing: Anytime you present him with the idea or introduce a new aspect of your sexual fantasies concerning Black-on-white "interracial" sexing, make sure you have a good view of his crotch area to see how he "naturally" reacts. - Because erections never lie!
Now that was a bunch of ideas and i hope the one or the other is helpful to you. Good luck and have fun!
BTW, one question: In what country or part of the world are you living? Thank You.