Female led relationships discussion

when we first started, I enjoyed the kink of a good spanking. I encouraged it by investing in some good quality tools. At first it was by my suggestion and firm but enjoyable. Often not long enough. Over time, something clicked with her and she found it not only erotic but a form of release and communication. Just yesterday, I gave her a pretty bad mood and behavior after something upset me. She dropped what she was doing and retrieved her crop. She demanded I report to the edge of the bed. For the first time, I did not want to go and I did not look forward to my well deserved punishment. After I was in position she asked how many, and I cowardly said two. She laughed, “we will start with 8 and go from there.” I spent the next few mins squirming on the edge on the bed as she slowly delivered at least 10. As the sharp stings and strong delivery make it difficult to count. After the correction, I apologized, we kissed and reconnected. I thanked her and we moved on. Here I am, still stirring from the shift spanking has taken in our dynamic. What started as my spanking fetish has awoken her disciplinarian. My pleasure now transformed into a hope that I don’t step out of line. Don’t know how to end this post, I don’t know if I should issue a warning or pick the brains of CM on what has happened to their relationship with spanking. Any replies are not going to relieve the shock that it is no longer my fetish, but hers.