For Me, the joy of BDSM and the D/s relationship is the Power Exchange. Total Power Exchange can be accomplished without one drop of pain or one harsh word. It's about getting into a sub's mind and knowing which buttons to push to get the desired response. Sometimes a soft whisper can be more effective than a sharp slap - but in the end, the sub will get what he deserves.
I am a professional and respect limits. Safe words are always used and no act will be allowed that can cause you serious harm.