Introducing My Wife To BBC Porn

My wife Susan and I have been married about two years. She is a redhead 5' 2" tall and about 112 lbs. She is very shy and it`s hard to really know what she is thinking sometimes. I had been watching different kinds of porn for years before we met. I started to really get into interracial porn and started to sometimes picture her taking a big black cock. One good thing is that she enjoyed watching porn movies with me then would have sex it was great but it was always a white couple. So I wanted to see her reaction to white girls taking big black cocks. So One night I said lets watch something different. She said like what? I said you pick one between a black girl with a white guy. An all black couple having sex. Or a black man with a white girl. She thought about it for a second and said a black man with a white girl. I was a little surprised but exited. I clicked on a movie and she started watching it. Her eyes were kind of glued to the screen as a black guy with a huge cock started fucking this girl. I asked her what she thought, was it hot? She didn`t answer. So I asked her again. She just kind of laughed and said I don`t know. So I just let it go for a few months. Then we were about to have sex and I picked an all interracial movie. First scene was a black couple with a white girl. I asked her who do you want to see him fuck first? She said the white girl. I thought it was interesting, but we both enjoyed it. A few weeks later we were talking about our favorite scenes from movies that we had watched. I had asked her what her favorite threesome was and she said you remember then two black guys were fucking that white girl. I asked if she thought it was hot and she just king of went mmmmm. I said how would you like to be that girl with two black cocks in you. She said I`m sure I wouldn't be disappointed . So I think she is kind of into it but not sure how much. I did buy her a dildo about a year ago but it was not black. Not sure what my next steps are. The more I think about it the more I want to see her taking a black cock. Any of your input would be appreciated.