More than anything, Sammy wants to help Dean feel better when he gets hurt. He doesn’t know how Dean gets hurt, and he doesn’t know why, but he knows that he doesn’t like it when his big brother’s in pain.
Dean sometimes gives him get-better kisses, like when he scrapes his knees on the pavement outside the motel, so that’s what Sammy starts doing, too- crawling into Dean’s lap whenever he comes home hurt and giving him little kisses over every scratch and every bruise, mumbling “get better, Deanie,” with every one.
It’s gotta be working, ‘cause Dean always smiles real big and hugs him after. Seeing all the hurt isn’t so bad once Sammy knows he can help.