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The hunt ran long. Longer than it should have, and harder, and by the time Dean gets the car back on the highway it's past midnight and the exit signs are the only light for miles.
Sam doesn't notice when you go under. He's got his phone out and his head against the window and he's somewhere between thinking and not thinking when Dean's voice cuts through.
"Aww." Low, aimed at the rearview mirror. "They're so cute when they're sleeping."
It's the voice you use for something small and unsuspecting. A puppy that climbed onto the couch and passed out, a toddler who fell asleep on the car ride home. He says it the way one parent talks to the other, over the head of something they're both fond of.
Sam glances back.
You're on your side with your jacket bunched under your cheek and your boots still on, completely gone. Not restless the way you sometimes are, just out, the way the hard ones take it out of you more than they take it out of them.
Dean doesn't say anything else. He reaches over and turns the music down until it's almost nothing. His foot eases off the gas slightly, smoothing out. His voice, when he speaks again a few minutes later, something low about the next exit, is half the volume it was before. That's how Dean does it. Quietly, so no one has to notice.
Sam's arm goes back without him fully deciding to. Long enough to reach, his hand settles against your side, light enough not to wake you. It's affection and it's instinct and there's something else underneath both of those. The specific need to feel that you're there. Solid. Real. He knows logically that you're fine. That you're right there. But logic has never been much comfort to him when it comes to the things he loves, because he knows better than most how fast right there becomes gone.
So his hand stays. And you're warm, and you're real.
Somewhere underneath the sleep, some part of you knows. Not in words, not in anything that will stick when you wake up. Just the warmth of a hand, the low rumble of Baby taking you home, and the quiet sense that you are not alone. That someone is watching out for you. Actually, two people are, because this is a family.
Dean drives smooth and quiet through the dark, and Sam doesn't move his hand, and outside the windows the mile markers tick by one at a time.