anon would like something based off of this very much.

Maybe Haytham ended up winning the fight at Fort George and kept him in hiding until the Templars won control completely and presented him as a prize to Charles now that Charles is to be the leader of the new country. Haytham and Charles might've already been in a preeatablished d/s relationship and is quite willing to go along with whatever Charles wants, even if it means being kept on a leash like one of Charles' dogs, and helps train Connor into being a good "dog" too. Obviously Haytham would always be Charles' favorite and gets special attention.