Looking for a Servant of Two Masters type fic
Can anyone help me find a specific fic? I don't remember much from it- really only a single scene. But Merlin is made to be Arthur's assassin (idr by there was something to do with a blade and maybe a vial of blood, but this may be a different fic altogether cuz I do remember a fic where a vial of blood is used to control Merlin. If you recognize this one as well I'll be happy to read it again as well.) but what I do remember is there is a scene where Arthur believes Merlin to be locked in the dungeons, Agravaine convinces him to have a drink with him in Arthur's chambers after unlocking the cell. Merlin sneaks in and Arthur is faced away while Agravaine is smirking at Merlin. But Arthur sees Merlin in the window's reflection and diverts the attack.
I believe in the beginning Arthur and Gwaine I think (maybe the others as well) Happen to track Merlin to Morgana's cabin where they see Morgana use the Fomorroh and instruct him to kill Arthur. They get him out and have to travel back to Camelot, and Merlin tries several times to kill Arthur, but he is constantly fighting the influence, though mostly unsuccessful.
I am sure it was canon age, and I think on Ao3 but I could be wrong.