Pleasurable physical sensation changes from its usual state to a worshipful increase in obedience and subby puppy thought for your handler. When you touch yourself, your mind produces more relaxing submissive thought, which expands to fill your mind. When you would normally reach your most intensely stimulated, you are overcome by submission instead. Null puppy, and a finger snap, is enough to put you in a frame of mind where you care less about your body, and more about your good puppy nature.