When dealing with dynamics not constrained to bondage or even the bedroom, a similar experience can be very useful keeping a boy in line - no, I don't mean actually biting him in the face. A friend I met over MAL had a story about his girlfriend/Domme catching him with a female friend sitting in his lap in the middle of a vanilla/platonic game night. She politely asked the girl to get up and once She was clear She proceeded to grab him by the neck throw him to the floor, planting a foot firmly on his neck. Needless to say, the lessen sank in and he hasn't done it again.
Point being: something that assaults your senses so fully to the point where every muscle in your body is trying to respond and you have no idea what the fuck is going on, it's a pretty overpowering experience. Of course there are other ways, but if your goal is an incredibly timid sub it's helpful to have something so sudden and staggering sitting quietly at the back of their mind.