Looking for a Merthur fic
I'm looking for a Merthur fic, where Merlin is a merman who gets captured and put in an aquarium. It is a modern day setting and Arthur and the his friends ( the knights) come by to get him out after seeing him trap in there. (They didn't know each other before).
I remember that Arthur in his attempt to save Merlin gets trapped underwater ( in Merlin's tank) and would have drowned without Merlin's circular breathing technique.
Thank you.