Claire narrows her eyes, somewhere on the pricpe between relaxed and defensive. She doesn't like talking about these things, doesn't like to be on the emotionally vulnerable end of a conversation. So she downs the rest of her drink, motions for Cas to do the same, and pours them both more alcohol.

We're too sober for this shit. Question, though. So you're like. I mean, I remember what you felt like. Totally not even really human - I mean, just... light and energy, right. But obviously, you've grown beyond that. You have feelings and shit. So, how did you know? With Dean, I mean. How'd you know it's love?