Mature couples interracial fantasy

We are a mature couple that have been married for 22 years and I am the male and 6 years younger than the wife and I brought it to her attention several years back that I would love to see her with a much younger and hung black man and of course I could tell she was interested. But my wife is pretty smart too, she seems to know just how interested she really is as to not act overly excited at least in conversation but from time to time she lets her guard down and gets super excited like when we watch interracial porn she'll get to squirming quite a bit and moaning especially when I tell her I would lick her pussy if she was getting fucked reverse cowgirl then she'll start telling me if I did she would make me suck his cock which I've told her I would if everything was hot and she demanded I do and I never have before. Now my wife has told me that her past relationships with other guys that she has always been lucky when it came to being with guys that had big cocks but in my case no so much as I'm just 6.5" with girth but she's talking about 8+" but wants a black man or men even bigger than that. She has a bigger sex drive than I do and my hard ons come and go when she really wants it. In fact I'll start talking about her getting fucked by big black cocks and she'll start grunting and groaning saying yeah give it to me. We have even went out to bars and once she wore a pair of dangling black cock earrings and wasn't wearing any panties or a bra (my wife is a good looking natural blonde too) and that night it was almost closing time when this black guy came up to her and started making small talk but I'm not sure he seen the earrings but much to her dismay there just wasn't enough time for them to chat for him to suggest they get together so no connection. But when we got to the car she said to me "I would have brought him home and let him fuck me and would have even road in the back seat with him for the ride home as I drove. So when we got home and shut the car off she was playing with herself so I reached down to start rubbing her pussy and she was soaking wet and she said to me "How hot would it have been if I had put the seat all the way back and layed the seat all the way down and had my legs spread wide open with my feet on the dash and he was on the floor between my legs eating my pussy while you drove" and that was hot. But like I said she never really completely says just how far she would go. So I'm asking if there are any thoughts as to how far you think she will go ?