oh sooner or later it all comes down to faith (слэш)

Getting used to Heaven is something of a marvel. It ain't perfect, and Dean thinks he'd hate it if it was, which is probably why it isn't.
~~~
"You don't understand," Dean whispers, exhaling shakily. "I know you don't, because even I don't. The instant you were gone, I wanted you back. Cas, I wanted you back. I wanted—I wanted—"
Cas stares at him, searching his face. After a moment, his own face falls slack, eyes widening just so. "Oh," he breathes out.
Dean wants to be furious that Cas has figured it out before he has—whatever it is—but he's not even that surprised. Cas knows him too well, always has, even more than Dean knows himself. He's been kicking Dean in the goddamn teeth with how deeply he understands him, even about the things Dean doesn't, ever since they first met. You don't think you deserve to be saved, that's what Cas had said. All bundled up in impossibilities and power, this being that looked at Dean Winchester and knew every single inch of him, as if he had a right to each part.
"What?" Dean grits out.
"I love you, too."