Title: I Gave Myself Away
Pairing: Morgana/Gwen (secondary pairing: Merlin/Arthur)
Rating: PG-13 
Summary:Every night, Gwen waits on the battlements. From there, she can easily hear the sounds of her husband, Arthur, and his manservant, together in the bedroom.
Then, Morgana finds her. 
Based on the song 'With or Without You'

Also on A03 and FFnet

( I Gave Myself Away )