I'm searching for this specific J2 AU historic fic. It's set in Restoration England where the King Charles II has returned to rule after Cromwell & the Puritans. It's NOT Annie46's The Molly House (though that's really good, check it out). In the fic King's supporter Jensen has been granted rule over the castle where Puritan Jared lives. Jensen had earlier conquered the castle, and because of this he doesn't believe that Jared can love him. There's a part of the story involving bringing back Christmas celebrations, too.