Escape your chastity belt/special chastity
You wake up with a weird feeling on your crotch you pull your bed sheets to see what it is to find out that there is a tube around your penis which is attached to a ring with a lock preventing you from removing it. Somebody must have put this on you while you were asleep. You blush at the tought that someone saw your prick. You have to find the key to remove this thing, but first you have to take care of your morning erection. You can feel the tube a bit thigh and it seems to be made of some sort of elastic rubber which makes you able to have an erection. Has you attempt to stroke your dick you notice to your horror that you are unable to give yourself any stimulation. You think that it may be the purpose of thing. You realize that you won't be able to masturbate while that thing is on you. Unhappy of not being able to give yourself the feeling you love so much, you get dressed and
You procced to school normally you are too ashamed to talk about this.
You go ask your older sister about the device.