[Merlin Reverse Big Bang] Although the first meeting of betrothed princelings Arthur and Merlin does not go as planned, nor most of the following meetings, by the time Merlin is kidnapped a year before their wedding, Arthur is left distraught by the loss. For Merlin's kidnapper, there's only one plan: torture. And it's all going as expected. AU; Top Arthur / Bottom Merlin.

When Merlin proposes to his sister, Arthur knows nothing will ever be the same between them, and he can live with that. He won't be happy about it, but even if he's loved Merlin for years, he's not going to stand up at their wedding shouting, "I object," not when it won't do him any good. And then the stag night happens. (Merlin/Morgana, with Merlin/Arthur as the endgame)