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Merlin Slash Modern AU. Warlocks are enslaved and sold to be either sex slaves or servants. Merlin was captured and sold to Camelot's Underground, a company run and owned by the Pendragon's. The Pendragon's run a large corporation that buy and sell warlock slaves and run several brothels where warlocks are used as sex slaves.
Arthur works with his father and comes across Merlin who is also a carrier, one who can carry children, and decides to keep him.