Yes, just like that. Dick in hand, throbbing to get erect, and you doing everything in your power to hold it back, keep it from slipping out. For once that lock is gone, and the only thing keeping your penis caged is your own hand. Here I am, stripping so sexily for you, and the only thing that you need to do is take away your hand and let it free.
But you're going to keep it caged. Because your mistress told you to.
And you wouldn't want her to stop, now, would you?