I'll Just Wait Here Then

Siobhan/"Dean": Okay, so, you can pop in tomorrow morning.
Kristen/"Castiel": Yes. I'll just -- ... wait here, then.

This exchange of dialogue before the song "I'll Just Wait Here Then" also occurs between Dean and Castiel in the episode 5.04 The End.

In Supernatural: The Musical! in 10.05 Fan Fiction, a song called "I'll Just Wait Here Then" is sung by the Castiel characters.

You can download the song for free here.

I'll Just Wait Here Then I’ll just wait here then That’s what I’ll do I’ll just wait here then Wait for my cue. I raised you from perdition to be God’s ammunition But now you need some rest so I will do what’s best I’ll just wait here then That’s all I’ll do I’ll just wait here then I’ll wait for you – Lyrics by Robbie Thompson, sung by Nina Winkler; music by Jay Gruska and Tim Pierce