I read this a long time ago and I can't find it now...

Basically John finds out about wincest and kicks Dean out. Years past and Dean works in a local uni teaching mythology / writing (can't really remember the exact subject) and Sam turns up to consult him, not knowing that it's Dean. One part of the story has Dean running searches for Sam everyday and printing out the results. He keeps a whole stack of unsuccessful search results.

Some one please help! I tried looking through the tags but can't seem to find it... Must have missed it out somehow. But I did find other wonderful fic :)

Edit: Found by wolfish_willow in comments. Thank you!