Dean knew he was gay since the 8th grade but hasn't found the right guy yet. That all changes when he bumps into someone in the halls that he's never seen before.
The angels have fallen. Castiel lost his grace, and is now a human. He experiences hunger, cold, need, but still pondered at the thought of love. Dean takes him under his wing and helps him understand his new way of life; every aspect. Even though his grace is lost, the affair between a man and an angel is forbidden...