Based on Season 4, Episode 4 "Metamorphosis"

Prompt: "It doesn't matter what you are, it only matters what you do" – Sam

Recently it had become a sort of mantra for Sam – it didn't matter that he was a blood drinking psychic – only that he used his powers for good.

It was hardly a solid argument but Sam was sticking to it. If he could convince himself of this then maybe there was hope.

"It doesn't matter what you are…" And what was he? A hunter? An adult from the moment he was thrust into Dean's arms all those years ago? Mostly he was a brother, and he knew it: watched hopelessly as it dictated his every action. There was nothing he wouldn't do for Dean – but what he didn't do was dependent on who he was.

He didn't reach for Dean's hand when he saw the man was falling apart. He didn't wrap him in constant Sasquatch sized hugs just to keep him safe. He didn't crawl into Dean's bed in the middle of the night to trail kisses from Dean's neck down to the base of his spine – he didn't love him either with his lips or with his body.

It didn't matter that Sam was crushing on his big brother, it only mattered what he didn't do about it.