> I am seeking advice on how to attract her interest in taking control of my sexual needs
She will need to see a benefit to herself. Whether it's that it gets her hot, or that she likes your attitude, or she loves how much you trust her and give her control over some of your most intimate functions ... any or all of those and many more, it's got to be fun for her.
Since she's open to play, continue playing. Share with her how you feel when she denies you; hear from her how she feels. As for protocols, that is, when does the cage go on, come off, etc, that HAS to be all about her. If she's just doing it to humor you, she'll get tired of it eventually. If the cage goes on when it suits her, and comes off when it suits her, and that act does something for her, that's when she'll be invested. That likely means that whatever fantasies you have about how that's all going to go, won't be how it's going to go

. The best thing you can do is become flexible, malleable, to play the game the way she wants it played.
My 2 cents
