The Winchesters using prayers as memos for Cas.
“Heya, Cas, we’ll be in Iowa. I’ll tell you the address later.”
“So get this, Cas, there’s an actual convention of beekeeping. Think about it.”
“Well, Cas, I’ve just officially been the most embarrassed I’ve ever been. I’m not telling Sam about it but I don’t want you staring at me when I say it, so sit tight.”
“Hey, Cas, can you pick up some milk on your way back? Thanks.”
“Cas, I’m sorry.”
“Dean doesn’t wanna say he misses you but he does, dude. Just wanted to make sure you knew.”
“Cas, I need you.”
“Hey, uh, Cas, next time you and Dean decide to have fun in the bunker, soundproof whatever room you’re in. Seriously.”
“Get home quicker, baby. I have a surprise for you. But remember to pick up some milk.”