The facility of this story is called The School of Denial for a very good reason. The inmates are never allowed to cum, in fact unauthorised spurting results in instant failure. Failure results in expulsion. Expulsion results in the fitting of a permanent chastity device with devices fitted into the prostate and the cock head to keep you constantly aroused but unable to get erect. Expulsion also means reinstatement of your original prison term. There will be times when you think you will not be able to continue without breaking the two rules of the facility Rule 1: Never Cum Rule 2: Always obey the instructions
