Crowley knows that Castiel isn't all that naive. He teases, yes, but he could easily find other things to tease Castiel about, too. No, Castiel is clever. Crowley wouldn't work with him if he wasn't.

"It can be." Crowley settles his head on the pillow, lying still half on top of Castiel. "I wasn't planning to kick you out, though. Sometimes people linger. You'll learn how to tell when you're wanted."

It's the closest Crowley is going to get to telling Castiel that he is wanted. He already wants to kiss Castiel again. He bends his head just enough to kiss his shoulder instead. It's a stupid indulgence and he's letting himself get a little too into this, but he's allowed indulgences here and there and it's unlikely that Castiel will really know enough to call him on it.

The hand that had tugged at Castiel's hair now sifts through it lazily. He doesn't let himself really hope that Castiel will stay, but he can admit to himself that he'd like it.

Together, he and Castiel might just be unstoppable if his plan works. Heaven and Hell and Earth can be theirs.