When stricter enforcement is necessary...put your sub in their place with this adjustable wooden humbler. Your sub will be bent over and locked to keep them on their knees and at your complete mercy. Ingeniously designed to curve and fit below the ass with the scrotum stretched through the adjustable opening.
Wing nuts at either end of the Humbler allow you to open and close it. The tugging on their testicles will increase as your naughty sub tries standing up, effectively keeping him bent over to take whatever you desire to give him. Is it a reward It is your domain...you decide.