It is an interesting thought, devotion through pain, I had to think for a bit what i wanted to say when I first read it.

I have to say sometimes the sweetest moment is when someone lets me do something that will hurt them, offers it to me, asks me for more and allows me the trust to stop. It is more than devotion from that side, it is an acceptance of a responsibility as well. I know when I see the nail marks, bites or bruises that I was the one to make those, I marked what was mine to do so at that moment.

Conversely to accept what might not always be pleasurable in order to submit to the will of another, to allow yourself to overcome the fear of pain for the greater experience is also just as rewarding. It can be just as thrilling to look at the results in the days that follow because you know how they got there and it reinforces the submission felt when they were recieved.