Imagine being subjected to a spiked chastity cage. Imagine that its one and only purpose is to reduce her to nothing. Every time she gets an erection, the spikes in the cage remind her that she mustn't get hard anymore and that she's locked up. Why is that? I don't need it anymore. But in view of your obedience, I've decided to set you free. But you will not be allowed to touch yourself. I control your ejaculations from now on. I can see you loving my heels...