Oh, Cas. That's precious and endearing that he believes in humans that way. See, he's learning to read Lucy's signals as well. She doesn't mind that he's caught off guard and leans in. In fact, it teaches her that he doesn't care if she's got spaghetti breath; he'll still kiss her. The stupid thing makes Lucy beam. She appreciates any sort of positive praise. "Thanks. It's strawberry shampoo." If it's a weird compliment or a stupid thing to say, Lucy doesn't show it.

Lucy is very patient and a little weird herself. She's also adventurous so Castiel gives her a chance to try new things and encourage him to try new things as well.

Angels are dumb. One would think with all their power and knowledge they'd have a thousand words for love and family. Lucy notices his struggle but isn't sure how to help other than to listen and let him struggle. Butterflies of panic and anticipation take wing in her stomach when he says that. She puts aside the bowl of pasta in favor of focusing on him. "More how? More what?".