Thrill to the sight of your man's once-proud member locked away in a steel cage.
With his manhood imprisoned, he will become attentive to your every need, learning new ways to service you. All the while you wear his key between your breasts, showing everyone that you are in charge and that your man is indeed caged.
And when you require a sturdy penis? You could release him, but why undo all your hard work? There are plenty of eligible bulls out there to satisfy you.
