'I understand.' David said, before he hit again, this time a little lighter than before. 'You will enjoy the nice side of the pain. It's an adrenaline rush, I think you'll find. It can often intensify your good feelings.' He leant down and turned the vibrator to a higher setting, working away at her pussy. He then carried on with the whip, trying to measure how hard he was hitting her to make sure he got the right kind of hit that would be a mix between pleasure and pain.