This is my favorite work by Neko, hands down. It not only intrigued me of the Master/Slave dynamic, but the analysis and relationship of it all, and how something that inflicts pain can be so healing. I said Side A felt like something was missing, and this one fills all the gaps.
Definitely would not have made as much sense if Side A is not read. Good read over all though. The revelations about the character of David are interesting as well as the heavier psychological aspects applied to each character.