I just read this and had to share. Totally crack and some fun Sam/Dean sex inspired powers :P The story was written by
silverpenlight Incest Powers Activate. So here's the thing. Apparently, psychic powers are contagious. And not only that, they're STDs.
Favorite randomness from it:
"This time, he can talk to ducks. Turns out they don’t have much to say besides things like “Bread” and “Pond” and “The Russians are planning world domination by marmalade.”"
:P