A/N: Takes place sometime during Season 5, but no spoilers. Happy birthday Clarabell27!
"Why are you watching others procreate?"
Dean startled at the angel's sudden presence and threw his hand up, shielding Castiel's eyes from the computer.
"Cas, we're getting you a bell."
"Why?"
"So I can freakin' hear you coming! Besides, every time a bell rings an angel gets its wings..."
"There's no correlation between bells and wings."
"Whatever."
Castiel's brow quirked, his head tilting as he watched the screen again.
"I was unaware your species could reproduce in that manner."
"We can't...dude, it's bad enough I had to have this conversation with my brother. I'm not having it with an angel."