I logged in to repeat what Mistress Ultra Violet was saying about Atlanta Dungeon. I have had the joy of keeping a handful of prisoners there overnight, some more than once, and quite convincingly. There are a number of possibilities for confinement as well as options for multiple Domme wardens/captors.
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Madam Jess
Assistant Manager, Atlanta Dungeon
madamjess@protonmail.com

http://www.madamjess.com
http://www.atlantadungeon.com