I need to watch this scene again (I really like it), but while watching these pictures I was wondering: while Brian runs his hand over Justin's head, is he - perhaps unconsciously - also checking the scar?
Could there be a link between Brian's obsession with running his fingers through Justin's hair and the bashing?(BTW, I just realized how symbolic the buzz cut is, since it is caused by the bashing, however indirectly).
And to answer your question I love the scene in 401 where Brian is on the phone, in bed, Justin comes out of the shower and Brian runs his hand through Justin's wet hair. The petting there is beautiful.