Advice for getting wife in BBC

Wanted to get advice from guys on here on how to get my wife into BBC. She's turned on at the idea of being with another guy and I've caught her a few times watching IR gangbang porn. Black guys are always checking her out; brunette with big 36 D tits and a nice round ass. So, how do I get her on her knees sucking a big black dick? Any suggestions? She's got all these pics of black cocks on her phone, she gets turned on looking at them. She's never done anal but I know she fantasizes about it with a black guy. She also likes dirty talk and always tells me how she's gonna make me watch her get fucked by a bunch of black guys.