Based on Season 3, Episode 14 "Long Distance Call"
Prompt: "Now you're keeping secrets from me Dean?" – Sam
"You really wanna talk about whose keeping secrets from whom?" – Dean
Dean knew all about Sam's dirty little secret even if Sam didn't. Sam's mind had blocked it out in an attempt to protect itself, but Dean knew Sam better than that. Beyond that.
Dean knew that when Sam slept he said Dean's name; that he curled up towards the side of the bed closest to Dean's and slept most soundly there.
Dean knew that during a hunt Sam would reach out his hand to touch Dean's – to check he was still there – even if it was an action so involuntary Sam himself had yet to register it.
Dean knew that when Sam got drunk, his little brother tried to make out with him. That the memory cells that stored Sam sucking Dean off would be long dead by the time Sam awoke.
And Dean knew that as long as Sam needed to be in the dark about these things, he would keep his mouth shut. It was up to Sam to reveal this secret to himself – but Dean would be waiting for when he did.
