I have a weakness for those moments when Cas is panicking over things he doesn't understand and he turns to Dean for guidance. Like when his "date" turned into a babysitting gig...Dean is super sweet and encouraging, calming him and helping him with clothes and pointers, and later talking him through what to do with a sick baby. Or the voicemail ("the voice says I'm almost out of minutes!"). Cas rarely shows fear, but he lets his uncertainty show when it's with Dean.
Oh my God. The scene with Cas thinking it was a date then being wrong tugged at my heartstrings in the BIGGEST way. And, it was so telling that Dean was the one that was there for him in that moment. Gah, I love this. Our sweet human!cas is bumbling and beautiful, and even if we’ve seen him shove a bullet through another angel’s eye and literally take on the forces of hell, he is the softest, purest thing in the world. And, I love the moments when Dean is so gentle with him. Like, give me more soft!cas and gentle!dean. I need it.