Well do you want to be a cuck where she is fully in charge? Or do you want more a hot wife? If you want to be her cuck, then have her do what she teased about, put yourself in the chair and watch her fuck herself with that big dildo, have her imagine a stud and his huge cock, have her moan his name and beg him to fuck her harder and ask if you're watching while she's doing it. See how that goes. 
I'm not a cuck, just the opposite, but I had a thought anyway. Maybe go out together, and watch her flirt at a bar or club. Set some HARD RULES that nothing happens beyond some dirty dancing and maybe some touching, and see if you can handle the jealousy, and see if SHE likes the attention from other men for real.
