Permanently sealed prisoner.
Sheathed and caged cock stretched with a thick sounding rod, stimulated by never ending electroshocks and vibrations while blocking the ability to cum.
Stomach deep gag and plug keeps the slave's holes stretched and ready for use.
Art by @rynnks
On the off chance that some of the automated systems should glitch, & leave the inmates only partially tied & raring to escape.
They really better do it well, not many chances like this is possible, & attempts are severely punished!
By the brilliant @EUDETENIS
Thank you!^^