A female executioner becomes enamored with a convicted killer of women. Handling his headless body, she inserts his postmortem erection into herself and becomes pregnant with a daughter. Many years later, the girl adopts her mother's profession- And her father's passion.
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Stargate Atlantis fanfic: A late episode has a main character body-swapped with a criminal, and almost executed by decapitation as a result. The device responsible works from very far; Her friends could reverse the body swap a few seconds after she is beheaded. A bit gruesome for that series maybe, but it was almost over by then so maybe they would have been willing to take the risk.
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A military unit of hundreds of women retreats from battle against orders. They are punished by decimation; Ordered to execute one in ten among themselves.
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A couple register for a luxury cruise years in advance, but the wife dies in the meantime. The husband takes his daughter with her ticket instead. As they sail and mingle, they independently become aware of very special gatherings aboard the enormous ships, where guests are willingly killed and eaten. As their interest in these events grows, a woman offers to do it herself and let them take their first picks from her body; But only after they show her something she always wanted to see.
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Low-budget tourists take an odd job as executioners.
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A normal assignment in wizard school is to perform human sacrifices and properly capture the released energies and/or the sacrifice's soul.
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A reality TV game allows each team to kill the contestants entering their zone; Heads placed on their pikes determine score. One contestant feels so guilty after a kill, she volunteers to be beheaded for her own team's score instead. Unexpected, but the rules as written do allow it.