Getting there - advice needed

I have made massive progress lately on getting my wife to open up and start cucking me. We have been married 11 years, 2 young kids so that impacted our sex lives for a bit but things are starting to go again. She really lost her sex drive for a while. However my wife is very shy at going to the next step always or truly opening up about it.

A little about her and what we do:
-We use a penis extender fairly regularly now - she doesnt want to everytime even though she admits it feels way better,
-Its extremely regular that I get her off with oral now and I never receive oral in return,
-She used to date black guys before we dated but never actually slept with any,
-She is in total control now of our relationship sexually, it just kind of happen over time,

Recently we had a night out and we really opened up. She explained to me that she prefers watching black guys in porn and likes big dicks. We have also openly realized that i have a short dick where I dont think we really knew before. We have measured and we have definitely talked about how its short and she knows that it actually really turns me on and will play with that fact once in a while lately.

So we are now at a point that its kind of out on the table but we were drunk (but not stupid drunk) that she likes interracial porn like i do. I was hoping to start regularly watching BBC porn to start to get her accustomed to cumming when she watches BBC. I just dont know how to bring it up as I know she wont want to everytime initially. How would you bring it up for next time? I really want to try to get her used to only cumming when watching BBC's and never when my dick is in her (we are basically there now with her almost never cumming with my dick now).
 
We or should I say I started out with pillow talk and some hint dropping. At my suggestion Mrs4 started dressing a little less conservative and as a result started noticing men checking her out more. This in turn led to more pillow talk and more hot action. With my encouragement she'd quite happily tell me about the men checking her out from one day to the next. This 'game' led to further wardrobe adjustments. I then eased her into looking at some fairly tame tumblr pages (she was a virgin when we met) which naturally became more and more hardcore. Then for some reason out of nowhere her libido went ballistic and that was my time to push a little harder. The conversation after she read 'Musings of an incidental Hotwife' was where Mrs4 the Hotwife was born and my path to cuckoldry sealed.

As a disclaimer, I would like to note that this approach worked for me but I am in no way condoning this course of action. Nothing would have ever happened without respect for each other and open and honest communication.

Mr4