Is this relationship starting out as a vanilla relationship? Do you know if she has any interest in other men? Black men? Is she interested in watching porn with you?
If she is, try some interracial porn, and see if she has any type of reaction. If she does, maybe, over time, if she is into it, get her a sex toy, specifically, a black dildo. See how that goes. I would think those, and talking about it, will give you an idea if this path will work in this relationship.