Arousal? Physically, my body will always involuntarily respond to corporal punishment by becoming aroused, but sex is the very last thing on my mind after receiving this kind of spanking. Being held, being comforted, being told that I'm loved, and forgiven, and everything will be all right is what I crave after being punished.
Conversely, the same scenario that seems so very non-sexual as it's happening may well be the same scenario that appears in my private fantasies for the next month, being replayed and refined in my imagination, and inspiring me to new heights of pleasure.
All of my emotional doors are blown wide open by such an experience, as if I've been caught up by the gale winds of some powerful authoritative force that I can't resist. I searched for this experience for most of my life, and now that it's here, the happiness and gratitude are overwhelming, and sometimes so is the resistance, and the uncertainty.