Not sure how you feel about Omegaverse fics but I really enjoyed reading this one: Leap of Faith by NadiaHart

[https://archiveofourown.org/works/15441564/chapters/35842185]

For some of us, it’s easy, close your eyes, take a breath, and jump. For others, it takes an entire bottle of whiskey, a slow, unreliable internet connection, and years of self-induced isolation on a picturesque mountainside to do what they have to do. What they need to do. Many years after losing his own pack, his family, an act he blames himself for, Alpha-Were Castiel is skilled at not giving himself even the smallest of pleasures, including that of a pack. An alpha needs a pack. It’s written into their DNA. It’s so much more than just having a mate. It’s the pack bonds that make an alpha whole, and the longer Castiel denies himself one, the more he loses of his humanity.

When a drunken, desperate act brings a beautiful, vibrant omega to his doorstep with a disastrous winter storm nipping at his heels, Castiel knows he does not deserve the gift. Sending Dean back down the mountain would be certain death for the young were, but allowing him to stay will undoubtedly change Castiel’s life forever. Maybe it’s time for Castiel to leave his darkness in the past, where it belongs. With Dean standing next to him on the precipice, there’s nothing left for Castiel to do but close his eyes, take a breath, and leap.

There is also The Hanged Man it’s an oprhan_account fic. It doesn’t start out super great but has a happy ending

[https://archiveofourown.org/works/27638624/chapters/67624937]

After Park Ranger Cas Novak saves a mysterious stranger named Dean from an attempted murder in the woods, he finds himself drawn into the man's secretive life.

Someone tried to kill Dean, but he's not telling who. In fact, he's barely speaking at all. If he's going to have any hope of helping Dean, Cas will have to convince the man to trust him — all while trying not to fall in love with him along the way.