Haha that was a sweet and flirty thing for her to say. It sounds like maybe she can have some fun with where you're coming from. Even if she never takes a Black partner, there's a lot of fun the two of you can have with building up a playground of BBC fantasies together if she doesn't feel threatened by that. Imagine spooning her and rubbing her pussy while the two of you watch BLACKED together, for instance. Your sweet wife, teasing you with naughty "BBC time" talk while she squirms against your hand. Maybe she makes a tinder account just for toying with the what-if hotwife snowbunny lifestyle. Teasing Black boys with coy messages so you can read what those naughty Black strangers would do with your shy white wife, if only she allowed them to. Picking out together those fuck-me heels she would wear with that slutty new minidress to that meetup that's never going to happen--no, never, because she would never seriously want to have a different partner than you, not even for one fun little hallpass night. But no harm in playing little games . . .