Slash or Gen. Wraith/Rodney or Wraith&Rodney friendship. (That Wraith must be male. It could be a OMC or Michael Kenmore or, if you really want, a Wraith!Sheppard.)Prompt: Rodney McKay gets stuck on an uninhabited planet for 15 months, and his only company is a Wraith. There is no way for McKay and this Wraith to contact Atlantis or a Hive. Even though there was no other human on this planet, there are plenty local plant and wild life to support a human need for living. For survival, the Wraith needs to keep Rodney alive and healthy, and the astrophysicist rewards by letting the Wraith feed on him now and than. After some struggle on each side, they set in this life. They bonded with each other eventually.
(Someone finally finds them fifteen months later, but whether they go back, stay on that planet, or if they separate or stick together is up to the writer. What happen next, or what won’t happen next, is also up to the writer.)
Ronon has to leave Atlantis for Earth for some reason (maybe to train the SGC soldiers to fight the Wraith, because that's apparently going to become an issue since Midway), but when he steps through the event horizon, there's a glitch.
Glitch causes temporal shift and shoves Ronon to the wrong end of the galaxy on the wrong end of hundreds of years later. He's on a backwater moon, on the Rim when he steps through an ancient, decrepit gate that flares to life for just a moment before powering back down again. He's stranded.
He makes his way to a rading outpost where Serenity happens to be docked. Mal and the crew are there to make some job, and the first person Ronon runs into is Mal, who notices he's a bit out of place and offers him a lift on Serenity. Hijinks ensue.
Bonus points for hooking Kaylee and Ronon up.
Slash or Gen. John/Rodney or John&Rodney friendship.
Prompt: After an accident, John (or Rodney) was turn into some kind of creature that only feed on Wraiths. (Not like how the Wraith feed on human, no.) Moreover, every time a Wraith comes within 10 feet of John (or Rodney), it either wants to fight/flight or, in most case, paralyzed with terror. Everyone should be pleased with this change, but Rodney (or John) doesn't.