Punishment

I've been thinking about this a lot lately. I want to spank her pussy again, but it needs to be for the right reasons. She broke one of my rules and she knows what that means. But I still don't know if she really understands why I am doing it or if she is just scared of me doing it again because last time hurt so much. It was hard enough for me to do it in the first place, but now that I have done it once before, there is no turning back now... at least not until after we both understand what happened and how important these boundaries are between us as a couple... especially since we live together too!