It is said that there is a female prison guard who has a reputation for turning even the roughest prisoners into model prisoners... Yumi, a female guard with a big, ripe buttocks, cuts off her ferocity with her secret prisoner management technique and makes her devote herself to her prison work, turning her into a model prisoner. That obscene method is to attach a chastity belt to the crotch of the prisoners using their obscene buttocks as bait, and only those who become obedient will be pardoned for ejaculation. Prisoners earnestly serve their sentences, dream of the finest ejaculation as a reward, and continue to earnestly complete their sentences.
