Oh, there you are pet, I was just thinking about you. A package came in the mail for you today. I want you to open it in front of me.
It's a pretty steel cage for your little clit. It has two purposes: one, to prevent you from ever getting fully hard, and two, to shield you from touching yourself with your hands. I'm sure you enjoyed masturbating like a pretty girl for me these last few months, but today that ends.
However, I am going to let you come today, as a reward for putting it on. You see, from now on, you can't stimulate yourself at all unless you are wrapped up in that chastity device.
Riley and I have the keys. We'll let you out for cleaning and safety purposes but, as your rules clearly state, you'll never be able to touch yourself again.
Does that sound unreasonably cruel? It does, doesn't it? And that turns you on, doesn't it? Put it on. Accept your fate.