It was!!!
I have yet to cry while playing, but this was a close as I have come and I really was happy enough to let it wash over me. I did worry that if I did my Master would react like yours and want to comfort me, as no matter what we do I know he would never wish to truly harm me, emotionally or physically but I know him well enough now that unless I used either of our safewords he wouldn't stop as that is what they are there for.
As for crying when overwhelmed, I do it often when we speak or share tender moments, there is something divinely wonderful about tears of joy.