I just need to point out here that when Kristen initially asked for a back-crack, I turned to find her arching her back and thrusting her pelvis at me while leaning against her chair. "That's not your back," I said, while she thrusted ever-closer. "Please, Kristen, don't make me use my chiropractic skills for evil!"
But then she pulled out all the stops and used her dark witch powers against me. So I did get to cop a feel, but I also can't feel the left side of my body. Because I actually cracked MY OWN back. So there, I am a fucking chiropractor. I knew just how to crack a back.