A Servant of Two Masters codas/aus

I'm looking for fanfics that take the episode A Servant of Two Masters from S4 (Morgana mind controls Merlin with the snake head) and creates codas or aus of the episode.

Something where we see more happening while Merlin is trying to kill Arthur--maybe we see him fighting the control, maybe someone else finds out (Arthur) and they discover Merlin has been enchanted, a fic where we see the aftermath of how this affected Merlin....I'm really hoping for something where Arthur finds out.

Thanks!