Trustee Prisoner-Slave
Occasionally - very occasionally - a foothole prisoner-slave can be granted 'trustee prisoner-slave' status by the Female Authorities. It is a highly prized role amongst the prisoners, as it gets them out of their cells. But it is, nonetheless, a highly pressurised role, as the trustee prisoner-slaves must follow their allocated prison-officer mistresses to booted heel throughout their shift, and they will also have specialist tasks to perform such as putting on and taking off the officers' boots and socks at the beginning and end of those shifts. They must also remain on their hands and knees at all times and look only at their allocated officer-mistress's feet, boots and socks. Any deviation from these stipulations, or shortcomings in their performance, will lead to the immediate loss of 'trustee' status and a return to their foothole cell. Plus, trustee prisoner-slaves can still be whipped!
Here we see one such trustee prisoner-slave anxiously focussing on his pretty officer-mistress's boots and socks as she is seated in the officers' locker room at the end of her long 12 hour shift. Soon the trustee-prisoner will be ordered to take off the officer's uniform boots and socks from her feet as she changes back into her civilian clothes for her journey home (at which point he will be returned to his cell for the night). But first he must wait whilst the officer-mistress checks something on her phone.
The longer he has to wait before performing his humble task, the more anxious he becomes, because untying the laces on an officer-mistress's boots is always nerve-wracking - to say nothing of then having to take off her socks without touching her skin! If he's lucky, the officer-mistress will allow him to mouthwash her dirty socks in his menial mouth overnight whilst he is sleeping in his cell - but she might just take her socks home with her to place in the wash. The uncertainty is only adding to the trustee prisoner's anxiety!
Even so, he'd rather be put to the test as a trustee-prisoner, than be stuck in his foothole cell 24/7. Many other prisoner-slaves would jump at the chance to earn trustee status. He must not screw things up!