was this a Destiel vs. Megstiel joke or…
…oh my GOD
holy fucking shit
[MUSIC CHANGES DRAMATICALLY]
You never watched HBO, not once? Girls?
TWO SEPARATE CONVERSATIONS ARE HAPPENING HERE.
- Dean thinks Cas is going back to Heaven for good, “locking the door behind him”, and is worried about Cas’s safety since the angels aren’t too happy with him.
- Cas, on the other hand, is thinking about how he’s going to “lock the door behind him” as he leaves Heaven, and how he couldn’t possibly stay because the angels want him dead.
Dean’s lines are ambiguous enough in meaning that Cas doesn’t realize what Dean was thinking until he says the E.T. line, which is when Cas pulls the confused face (which Dean just sees as Cas not getting the reference). They cupid shows up before anyone can elaborate.
TL;DR: CAS WAS PLANNING ON STAYING AFTER HE CLOSED HEAVEN AND DEAN DIDN’T EVEN REALIZE IT