The details in this are really beautiful - I mean, everything from the wrinkles of their clothing, to the body language. Just the way Sam's head is cocked - I can tell that his expression must be thoughtful and wistful; and the distance between them shows how he must have paused while Dean kept going for a couple of steps before turning and probably immediately understanding what was going through Sam's mind.
cuteness! i love that sam is wearing what looks like a decently full backpack, and is still carrying a book. and dean looks all casual but you know he's got all five sense trained on his baby brother.
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