Cas doesn't notice, he's actually kinda enjoying himself now
Cas: And every mornin' when I wake up-I wanna be who I couldn't say I'd ever been-But it's so much more than I ever was-If every night I go to sleep knowin'-That I gave everything that I had to give-Then it's all I could've asked for-I've been standing up beside everything I've ever said, but-Oh, it's Saturday night, yeah-