Dean has a bit of a kink for angel wings. Castiel has a bit of a kink for Santa #5.
Or:
The one where Dean and Castiel meet for the first time when Castiel bids on Dean in a Stripping Santas auction, and Castiel realizes Dean is his true mate.
When Dean can't get his co-worker to take a hint and leave him alone after a romp in the back seat of his car, his best friend Castiel steps in and pretends like the two of them are dating to get her off his back. Unfortunately, what was meant to be a secret between the three of them quickly spreads to their boss, and then the office, and then the entire city... and they really have no choice but to continue to go along with it.
When a fresh-out-of-the-closet Prince Dean is forced into an arranged marriage with the Princess of the Land Of The Angels, he’s sure he’s just signed away any and all hope of ever experiencing true love. But one knock on the castle door changes everything, and with The King and The Queen out of the kingdom and unable to interfere, Dean finds himself falling so hard and so fast for the first time in his life that he forgets to worry about the imminent return of his parents and what that might mean for him...
When Dean discovers a homeless man sleeping in his basement, he calls the police and has him removed from the premises immediately.
Or at least that’s probably what he should have done.
Instead, Dean makes the guy soup and winds up falling in love with him a little bit more every day.
After having trouble coping with a traumatic incident on the job, Dean takes his little brother's advice and leaves everything behind to go stay at the old family cabin in Colorado. Nobody's been there for years so it needs some major work, but it's secluded, and that turns out to be exactly what Dean needs in order to start to feel at peace again.
Now in the mountains with nothing but nature to amuse himself with, he takes up bird watching and plans a hike into the mountain range across from his cabin in search of a golden eagle. High up in the mountains, he discovers human footprints. Thinking someone is in danger, he follows them into a cave and quickly becomes familiar with a form of wildlife he never could have imagined: winged people who call themselves angels.
Castiel doesn't have children of his own, so perhaps it's a little strange that the highlight of his day has become watching a little girl learn to ride her bicycle in his driveway, but between a nasty break-up, a move to a new city, and the pandemic, there hasn’t been much to be happy about lately.
When he realizes the little bike-rider and her dad never fail to put a smile on his face, he decides to do something to return the favor, and inadvertently finds himself face-to-face with the most attractive man he's ever laid eyes on.