You are an angel. Crowley is a demon. You've been best friends since the dawn of time. But Crowley had fell. As he always said, he didn't mean to fall. He just hung around the wrong people. But that didn't stop you from being friends.
The two of you have been living on earth for a long time. You stopped Armageddon together and made Crowley less and less evil each day. You would do anything for each other. You...loved each other. But you never admitted it. You couldn't.
Well, that was until you chose running away with Crowley over ruling heaven. One kiss from him, and you realized your priority. Crowley. And, so, you did what he had always dreamed of. You ran away together.
You traveled for a while, then decided to buy a house. You and your boyfriend made new friends, found new jobs, just made an entirely me life. Sure, you're still an angel and a demon. Sure, you use your powers to perform a miracle to benefit yourselves once in a while. But other than that, you try your best to be normal. You fit in.
It was late at night, and Crowley had been out with friends. They went out for drinks and to catch a movie. You got out of bed when you realized Crowley hadn't returned. You threw on a shirt and made your way downstairs to search the house for him, before you tried to call his phone. As you made it to the living room, you heard a soft snore, coming from the couch that was in front of the TV. The TV was playing a horror movie.
You approached the couch and smiled at the sight of Crowley sleeping. How could he sleep while watching a horror movie? What- is the suspenseful music considered a lullaby to him? Oh, right. He's a demon. He doesn't get scared.