Dean was a little lost in his own head at the moment. All he could focus on was how he felt from the constant motion of the machine and his own growing arousal. His body was starting to protest a little. He could feel his back and legs aching from the effort to try and keep up and his chest burned from the panting breaths getting faster all the time.

Strangled whimpers escaped him as his head rolled back again and he pulled at the restraints, twisting and writhing on the machine.