Having limits and boundaries does not mean you are not willing to test them or push them later on in the relationship; it is a way for your partner to learn more about you. They will pick up on your reactions, the sounds you make, and how your body moves during specific activities or scenes. It is all about the subtle clues, and with time push past boundaries and limits.
Subspace is something that many submissives compare to an out-of-body experience or being lost in a world of bliss inside your head.
BDSM punishment is something we all enjoy when this is part of your dynamic. Many of us enjoy pushing the boundaries and breaking the rules to see how far we can go before being punished.