Your wife met her at the nude beach with you and she owes it all to you. She is bisexual like your wife is and struck up a conversation admiring your chastity cage. She loves the control your wife has over you. You do as well. Watching her with a woman is just as hot as with a man. And your wife loves a younger woman. Your reward as her cuck is you can watch, but this girl wants you to stay caged.
I love getting a teaser before that first date.