I'd say this is a pleasure & not a torture. It could be a torture if someone is at the on/off switch, always switching off when the sissy is close, and when finally permission is granted to blow, forget to switch off and leave the room for a long time.
My wife seriously was a mess for hours. No control over situation, tied down, unable to move, but mouth unblocked so I could listen to her moan, beg for it stop, ask more, please stop it and moaning and yelling and the towels under her soaked with juices. pulsating vibrator inside for 90 minutes