Dean watches Cas turn away and hears him kick Dean out, and he... he's pissed. That's what it is; that's all it is. He isn't hurt or disappointed or frustrated -- or, well, he is frustrated, but it's all sexual. And, by the way, he is really freaking sexually frustrated, and he wonders if Cas even gets that. Dean's been keyed up and ready to burst, just about, just from hanging around their freaking house because of the vibe Cas is putting off. Maybe this isn't something either of them would've chosen, but here they are now, and good God, why shouldn't they go with it?

But Cas is kicking him out. Cas doesn't want him.

He's going to blame the arrow for how hard that hurts, and he stares at Cas, his expression hardening and his jaw clenching, until he pushes at Cas's chest and then gets up.

"Screw you too," he mutters as he stomps out, shutting the door hard behind him.