Dean expels Michael by annoying him to the point of Michael noping the fuck out:
“What? No flannel with the outfit?”
“Baby would be able to drive way faster than this hunk of junk”
“I want Caaaaaaaaaas”
“Cheeseborger”
*sings* “I’m sexy and I know it” every time he passes a mirror
“Hey Mikey” “What” “did it hurt when you fell from heaven?”
“I am hands down the most attractive vessel you’ve ever had”
“Oh you asked for it now” *bombards Michael with images of him and Cas having sex* *michael’s grace sprays out in seconds* “I gIVE I GIVE YOU WIN OH MY CHUCK”
Wait wait, so what your saying is Dean is in there doing this: