It's easier to play the idiot, easier than he thought, easier than it should be. Ed follows, he holds on to the devices in his hands, and tries, he triesto ignore the 'We need to talk,' that he's just walked in on. The whole 'angel of the lord,' thing was cool, and he thought that he'd played it pretty cool, cool enough that maybe he should have considered becoming a professional actor instead of the top notch demon hunter that he is now. At least it would have paid better.
He races through the house, Ed caught up behind him, but not before signalling 'Not here,' with his eyes, and hoping, hoping beyond anything that the awkward angel gets the message. Hoping that at least he'll spare him embarrassment in front of Ed.
The fact that he never told Ed about their little rendezvous in the first place might have been part of it though.
Eventually, he can feel Castiel's patience wane, and he stops, stops Ed, and wonders if this is really the way it's going to go down.
But no, turns out, it's just the apocalypse.
His lips are stern as he talks, but Castiel's eyes say that they'll be doing some bonus scenes for the next ghostfacers episode after this, and Harry can't quite help it if he forgets to bring the camera.
[This is pure harry/castile crack. Please forgive me.]