A bewitching female guard's mature ass ejaculation control

It is said that there are female prison guards who are well-known to turn even the most rough prisoners into model prisoners... Yumi, a female prison guard with a large, mature, beautiful butt, uses her secret prisoner management techniques to reduce her ferocity and commit herself to prison work and turn her into a model prisoner. The method involves using obscene butts as baiting them as chastity belts to the prisoners' crotches, and only those who have become obedient will be given pardons for ejaculation. The prisoners work seriously for their sentences, dreaming of the ultimate ejaculation, a reward, and simply continue to pass the sentences seriously...