Title: Crossing Twilight
Pairings: McKay/Sheppard of Stargate Altantis
Category: A/A, Angst, First time, AU
Season/Episode: Beginning of Season 4 (Goes AU during Life Line)
Summary: Events send McKay truly adrift, as he is faced taking on the universe to save the man he loved from the people he spent years trying to protect: Earth.
Authors Notes: This story goes total AU during Season 4 episodes Adrift & Life Line and Carter NEVER makes it to Atlantis.
Warnings: Character death (not John/Rodney), Canon death, violence, sexual situations.