Slaves being tortured by technology can be very hot. Can't remember where but I recently watched a breath play/heavy rubber video along these lines. A male sub was secured to a bondage chair in head to toe rubber with gas mask.The masks air tube led to a box. A woman was also in rubber dressed as a nun. The only dialog was at the beginning when she opened a laptop on a table in front of him and said something like "You are sentenced to 30 minutes of penance."

She entered a command on the laptop and then sat down and started reading a book. The laptop screen displayed the words "NO Air" and then started counting down from 40 in large numerals. When the count reached 0 you could hear a faint clunk like a solenoid valve and you could tell the sub was able to breathe again.The laptop was obviously controlling a valve. The screen would change to "Air" and another countdown would begin. The times of "Air" and "No Air" varied between 25-60 seconds with the "Air" times always shorter. Sometimes at the end of a "No Air" countdown instead of "Air" the screen would read "Bonus Time" and a new countdown of 15-30 seconds would display. The sub thrashed around at some points as the "No Air" times got longer but the "nun" just ignored him.

The video was a little weird with no dialog and little action except watched the laptop screen and the sub's reactions. Still, I found the way he was depersonalized and left to suffer at the hands of a machine very hot.