I'm sorry but I am having a hard time understanding your post to a degree.

She states that she loved every minute of your encounter, but you state that you went to far with it.
So what I fail to understand is where things went wrong.
Did you permanently scar her or were you afraid of the marks you did make?
Was she subsequently upset afterwards or damaged somehow?
Did you ultimately lose control of how far you wanted to go?

It just seems that she enjoyed the crop, and you did not.
I fail to understand where the line was drawn and where you went too far with it.