#214 is a SPN wincest fic with knife play :D Full Tang and on re-reading it I'll go with this:
At the back of his mind, behind the ever-present guilt of ‘not enough, not enough’, Dean wonders how he can be expected to untwist anyone when he’s nothing but knots and tangles himself. Was it any surprise really that Sam had turned sharp around the edges, honed as he was against Dean and John? The thought feels rebellious and tastes like freedom.
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At the back of his mind, behind the ever-present guilt of ‘not enough, not enough’, Dean wonders how he can be expected to untwist anyone when he’s nothing but knots and tangles himself. Was it any surprise really that Sam had turned sharp around the edges, honed as he was against Dean and John? The thought feels rebellious and tastes like freedom.