good recommendations in this thread. extreme cruelty, to the point the victim begs for the release of death, are my favorite. looking for more recommendations.
here's some stories like that I've particularly liked:
Punished by ottomans (Story by gjpain)
https://www.cruxforums.com/xf/threads/punished-by-ottomans-story-by-gjpain.8011/
historical impalement execution, first person. also red hot needles and roasting.
crown of torments by synon55
www.bdsmlibrary.com
fantasy based on xena, captured warrior queen tortured for info and then just for revenge. long story with ever increasingly intense torture, using magic to heal them so they can be tortured again.
"Her mind cleared suddenly just as the device was folded and pushed inside her
rectum, making her arch in a howl of demented pain and twitch in screaming
agony while it was turned left and right mercilessly. She shuddered when it
was slowly pulled out to be heated again, wishing she could die before it was
used again, and more screams followed when the torture was repeated."
TORTURED NUDES FOR THE DEVIL'S CHARNEL HOUSE by Bleumune
a medieval count abducts and torture women for fun.
roasting, wooden horse, flaying with hot knives, red-hot needles, hot metal rods inserted , impalement, molten lead.