Thank you. I'm glad you found the story interesting. :) I'm sorry it looks a bit confusing, but there is a sequel to the story. The sequel includes a flashback to the past explaining the reason for the set-up. It's basically that Arthur needed an heir, and Merlin (with Morgana's help) found the solution to Arthur's problem.
Link to sequel: http://dk323.livejournal.com/72586.html
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Link to sequel: http://dk323.livejournal.com/72586.html