Here is a story and picture from M Palmeri. See his deviantart pages
http://mpalmeri.deviantart.com for more of this sort of thing.
"Just one more step forward, and I'll lift you up and on. It's already been oiled for you. Remember, it's your choice which opening it goes in. I'm sure you've had plenty of time to consider, given the violations you've already endured in the Count's torture chambers. But if you don't choose, the Count will choose for you, and he'll likely have me take you to the double stake, which will not only double your suffering but also the time it takes for two pales instead of one to make it through you...
"Once you're on, you'll want to try to stay on your toes and don't struggle. Struggling will just start tearing you prematurely, and the Count will enjoy that and leave you to it. If you don't struggle, he'll order me to get on with it. In any case, he'll probably order me to torment you one last time, either a forced orgasm or a last fuck in whatever hole is unoccupied. Since you were so obedient during our initial 'mercy plea' meeting, I promise I'll be a gentle as possible, but I must obey the Count.
"Then, when the Count gives the word, I'll drop the trapdoor. That will be the time to struggle. It will make it pass through you faster. Your instinct will be to try to grab the pale with your feet, to slow your descent. Don't. It's better to get this part over with as quickly as possible. To that end, you will feel my hands on you. Do not fight me. I must hold you upright so that the pale runs its proper course. If you twist, it may come out through your belly, or stick in your ribcage, and the Count will leave you like that for a day before lifting you up and starting over. Since you were so obedient with me, I will try to subtly push you down, hurry the process, as long as the Count doesn't notice. Then, at the last, I will pull your head back, so the pale can come out through your mouth.
"After that, it will be over quickly if you're lucky. At worst, you'll be left to suffer until the Count spends himself with his fresher victims and falls asleep. When he does, I'll try to finish you quickly. If I can't, if he decides to post guards, the most any poor girl has lasted in this dance is three days. But the worst of it can be done in minutes if you continue to cooperate.
"Now tell me: What is your choice?"