Very happy for you ☺️ Pain can be such a nice thing, especially when your play partner has a good sense of how much you can take and knows what they are doing. Really sounds like you had an amazing time.

I always love the aftermath and the marks it leaves, reminding one self of that good time. We're you left with any nice marks or bruises?

In terms of a pain scale, I don't think there is a universal method. In medical settings you sometimes get asked to rate your pain on 0 to 10 (NRS: Numerical Rating Scale), but that is very subjective. In my personal experiences, there is no upper limit to pain. You can always go harder and more extreme. It's way more important to discover what your personal upper limits are and define your scale from 0-10. That's why it's very good to do pain play with the same people that you did it with before, as they will learn what you can take and adjust the session accordingly, without going to far.