After season 4 and Atlantis is back in Pegasus. Jack is leader of Atlantis. A Christmas one where Aiden and an original character take over Atlantis to save Aiden's son. There must be Sheppard/Teyla and Jack/Sam.
After the events of Tabula Rasa, Keller realises some of the drugs given to the military to stop the amnesia haven't been returned. Sheppard then discovers that a certain Major has become addicted to the drug. Can be Sheppard/Lorne slash or friendship. Some McKay snark would be lovely too.