Kisses in the Rain

Told from a flashback perspective.

They quit the trials, and everything was going to be okay for once. Sam and Dean would hunt bad things and they'd be alive, and everything would be back to what they called normal. But when Sam almost dies from his wounds and the Angels fall from heaven, Dean knew that things were only getting worse. And as he was driving Sam to safety, there was only one thing on his mind: is Castiel still alive.

The storyline takes a turn after this seemingly familiar scene, and only goes downhill from the fall of heaven.