Cas in season 3 in heaven.
Cas- aw look at that little human, look at his face
Cas- oh dean, you lil cutie
Cas- wait, what's happening? Where's he going?
Cas- waiT NO! LUCI CAN'T HAVE HIM!
Cas- DAD, LUCI STOLE DEAN! DAD BRING HIM BACK, I NEED HIM
God- No Castiel
Cas- YOU CAN'T STOP ME

*in season four*

Cas- god commanded it...*i am so grounded*