Well just be prepare, because once th she starts enjoying BBC things will never be the same... I am talking w experience... But if you are a true cuckold like me, I can guarantee you will LOVE it!!!
I've "prepared" myself by being honest with my wife and candid about all of this. I came out and said I wanted us to be pragmatic about this because, as I put it to her, "you just might find a black man more sexually compatible with you than me" so I get why this might not keep going once it happens. She was in agreement.