On fanfiction.net, there are a number of stories set up in the style of one-shots that revolve around the Ryan/Sergey bromance. No one has gone so far as to write explicit slash yet(for fear of a slander lawsuit, I'm sure). Lol. Check them out if you're really so into it, and if you review or petition the authors, I know that there are at least two there who would be willing to write it.
here's some fics that are Ryan/Sergey
Date: 2009-04-08 12:25 am (UTC)http://www.fanfiction.net/tv/Paranormal_State/
More specifically,
http://www.fanfiction.net/s/4972849/1/A_Day_in_the_Life
http://www.fanfiction.net/s/4974259/1/Days_In_The_Life
http://www.fanfiction.net/s/4972464/1/Man_Hug
http://www.fanfiction.net/s/4965514/1/Wikipedia