Stargate Atlantis: Sheppard/McKay
The first story was written for the sga_flashfic school challenge and the second two follow that one. It’s an AU, but I love the way the author managed to bring it back to Atlantis in the end. The all-roads-lead-to-Atlantis approach to AUs is one of my favorites because there are a lot of possible ways John and Rodney could get there and I love seeing that played out.