Mm getting into some good stuff; touching. One of the most common signs of attraction is unnecessary touching. For example: putting your hand on their shoulder, leaning against them, or just random touches to the knee, face, or back, etc.
This is also something we commonly see between Dean and Castiel. For crying out loud, there's even a special shoulder Cas touches on Dean! SPOILERS: it's how Dean realizes Castiel is not himself (and actually Lucifer) when he touched him on the wrong shoulder.
Unnecessary contact is not out of the ordinary with these two, and it's sure as hell classified as a sign of attraction. Why? Well if you've ever liked someone you'd know. You enjoy being in their presence, but those small "meaningless" touches that are actually loaded with meaning spark a different kind of feeling that's better than just simply being there with them. It feels good.
Dean could instruct Cas to fix his own tie, like a person would normally do, but instead he's doing it himself.
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