She loves black guys. Offering?

We might get back to Vegas in a few months. I'll try to get a picture of her if there's a possibility of a hook-up.
The trick is that she doesn't want to be whored out, i.e. set up with a guy who takes it for granted that there will be sex. However if a guy hits on her in a bar and she's interested . . . So you see my problem - wait for a chance encounter, be away from her and hope some guy hits on her and seals the deal, then doesn't mind me in the room or helping out.
I'm pretty much resigned that this won't be a regular thing, but she's cucked me three times (all at conventions). Twice I heard by phone and the last I missed by 4 hours. DAMMIT, I want to watch and go down on her/fuck her while she's still warm!

Lastly, she was having a real bad day after when she closed the deal on this guy being a regular bull. I may broach the subject during her next horny period, but I'm not counting on it.