Today I'll once again play a mean game with the slave. I blindfold him in the beginning - him to fully concentrate on his other senses. I'll sometimes be nice, caress his hand, lick his finger or even give it a gentle kiss - and sometimes I'll bite into his hand or finger hard - causing him massive pain. And since he's blindfolded there's no way for him to know what's going to happen next - no way to tell if pleasure or pain awaits him! After a few minutes he's totally confused and even twitches when I'm nice to him - as he fears for another rush of pain :-D