update on getting my gf into it

I have been a cuckwannbe for many years. My gf has been slowly introduced to it. I has taken me years to get to were we are but still she has not been with another guy. We are both still young. Few years ago I starting telling her i wanted to watch her with another guy but only during sex. She seems into it and even black cock while in bed but nothing out. I also told her what a cuck is and watched some videos.

I am thinking of getting a ankel braslet for her to wear when we go out but I would have to tell her what it means as this would be out of the ordinary. Any ideas. She is very hot.