The blue eyed man dressed in a grey trench watched as John Winchester shot the yellow eyed demon known as Azazel with Colt' revolver, definitely killing the demon.

He had kept his promise. He had protected Dean and prevented the heartache of Sam's dying. They had both given up so much, born so much pain, only because his brothers had wanted to follow a plan written several millennia ago. Because they had been jealous that humans had free will.
The fools. They had not understood that Angels and Demons got it too, if only they stopped blindly following and outdated script.

He had had to plan carefully to thank Dean for opening up his eyes and gifting him with friendship and freewill. He had bent time, helped the Shtriga do more damages than originally, and animated his friend's beloved car. Now Azazel was dead. Dean had not made a deal to bring back Sam from the dead. Adam did not exist as he had made sure that John Winchester now was sterile.

Soon, when talks of starting the apocalypse would have died down in both Hell and Heaven, he would heal Dean. And then,… So many possibilities opened.