Rock the Cradle by
philote-auctor. A trio of drabbles featuring baby!Sam.
To Bitch, With Love From Jerk by
dotfic. This one starts off with a kindergarten Dean and features several letters he wrote to Sam over the years. Oh, Dean.
Snuffleupagus by
kellifer-fic. To use her summary: Sometimes imaginary friends... aren't. This story just smacked me in the face at the end. Beautiful.
Follower by
eloise_bright. Teen!Winchesters training. I really like the insights into the characters in this piece.
And one last one, also from
eloise_bright,
Seeing Red. A trio of drabbles moving backwards through time. Heartwrenching in all the right ways.