Cum restriction can be one of the most useful practices a dom can place upon a sub/slave. It can be hard for the person to deal with, the need to fullfill the passion and need that the body has, especially if the Master is teasing his pet. But it can be quite an enjoyable experience, it builds the desire, the need, the want and the aniticipation when you can finally cut loose and when you do. *Grins*

There is nothing like seeing how good a pet can behave while under such restrictions, especially when you allow a single finger to trace up and down their back...it can drive them wild and more than a few will not be able to contain themselves.