It's also very erotic to consider what your own reactions are as you write this story.
well, about my reactions I have always said that if (IF) it would be possible for me undergo a real Roman crucifixion, or similar tortures, maybe die on the cross among unbelievable torments and then, magically, get up in perfect health, I would do it. No doubt. I would love to suffer for the pleasure of the men around me, even if the second after the torture begins I would be in incredible pain and probably want to get out of that as soon as possibile.
About the description being cruel, do you really think it is? Ancient times were much more violent than now. Soldiers were used to kill enemies, and be killed, by shoving a sword in their guts, and watch them die in front of them. They were used to all kinds of violence. What I describe here is a torture, thought and designed to be cruel and inflict pain, namely what they did to criminals. Executioners, moreover, most probably were chosen among sadistic men. So, my first feeling is ithat I am being realistic.
But the important point is that you enjoy this!