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Use "demoness" in a sentence
"But the demoness was a creature as spectacular as she chose to be, capable of impressing even a king."
"That makes them easy pickings for the succubus a kind of demoness who also shows up on the doorstep, supposedly seeking shelter from the storm that whipped up out of nowhere."
"Now I owed the demoness a future favor in exchange for her helping me get my freedom."