After plenty of training, you are used to being locked securely into your chastity device for weeks at a time. The next step in turning you into a perfect sissy is training you to cum without your sissy clit getting hard. With enough practice you’ll be able to manage, I’m certain – especially once you realize that I am absolutely serious about never unlocking you. If the only way to cum is to learn to cum like the sissy you are, I’m sure you’ll figure it out quickly.