Castiel has been on Earth ever since he saved Dean from Hell. He is not used to being an Alpha and being in a body that has different kinds of urges and other behaviors, so Dean and Sam often have to help him understand.

One day, he was walking around in a park when he saw you sitting on a bench. He didn’t know why, but he had a sudden urge to talk to you.

He walked up and sat next to you. He tried to think of the best way to greet you. “Hello,” he said curtly as he looked at you curiously.