Pain is the perfect motivator. It can act as both positive and negative reinforcement when used correctly. The best way to keep you in line is through consistent discipline.
This is an outstanding video for any masochists or wannabe pain sluts. A siren voice slowly drowning you in a deep, masochist dream. Her commands sensual yet painful too. A sense of need for pain definitely makes its way into my brain more and more as i listen to this amazing voice