#creature!castiel

Chapters: 1/1 Fandom: Supernatural (TV 2005) Rating: Mature Warnings: Creator Chose Not To Use Archive Warnings Characters: Dean Winchester, Castiel (Supernatural) Additional Tags: Mentioned Charlie Bradbury, Alternate Universe - Fantasy, Sacrifice Dean Winchester, Scared Dean Winchester, Crying Dean Winchester, Hurt Dean Winchester, Dragon Castiel (Supernatural), Hurt No Comfort, Fear of Death, Licking, Crying, Metaphors, Suptober (Supernatural), Suptober 2025 (Supernatural) Series: Part 7 of Suptober 2025 Summary:

Everyone is somehow curious to look death in it's eyes and stare at it, while it prepares it's scythe and cuts of your head. Death might be kind to those who are not afraid and who are prepared to die, but does a person like that even exist? If so, Dean is not that person. The death won't be kind to him. But despite that, he opens his eyes.

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Suptober 2025

We've heard it's Mermay and decided to make our contribution with some of our favorite destiel fics involving Merpeople because who never imagined our boys as Ariel or Prince Eric? (No? Just us? okay then.)

A Fish Called Castiel by orphan_account [Explicit, 37k words]

Dean Winchester plans on proposing to his summer fling, Lisa Braeden. He buys a ring, against the advice of best friend Charlie Bradbury, and books a table at an expensive restaurant. Before he can propose however, Lisa breaks up with him. His pride wounded, Dean drives out to the coast, gets liquored up and throws the engagement ring into the ocean. When he goes in to retrieve it, he heads too deep and that should be the end of the story. He shouldn’t end up back on the shore, coughing up seawater with a beautiful young man tending to him. Dean doesn’t know where this man came from or who he is but he gives him the engagement ring as a thank you for saving his life. He never expects to see the guy again, but two days later he gets a call from the local Sheriff about a strange man she's picked up wondering naked in town with Dean's wallet and ring on him. The guy’s name is Castiel and, much to Dean’s surprise, he’s a mermaid.

A Fish Out of Water by MalMuses [Explicit, 64k words]

To tie up the loose ends of a hunt, Dean is forced to go undercover and visit Brock Pleasure Ranch, a horrifying establishment that markets its inhabitants to people with ‘monstrous’ tastes. It should have been a simple thing, to persuade a mer to give him a few scales for a spell. All part of the usual Winchester byline: saving people, hunting things. But Castiel is far less of a ‘thing’ than Dean expected. He might not be human, but he’s definitely a person. And that means he needs saving, too.

A Merman's Tail by remivel [Explicit, 14k words]

Castiel was a merman who was born with the tail of a Great White Shark. Treated as an abomination by his own kind, Castiel found solace in observing humans and following their ships. He was content with watching them from afar, until he saved Dean, a human prince, from being killed by a shark. Soon, watching Dean from afar was not enough, and he wished to leave his life under the sea for a chance at being part of Dean's world.

Beneath the Surface by riseofthefallenone [Explicit, 252k words]

An alternate universe of my beloved Out of the Deep that takes place entirely in the world of the Fin-kin. Castiel is still the bright-fin we know and love from OotD. But Dean? He’s a fang-fin; a violent breed of fin-kin who want nothing more than to bring war to Castiel's colony - or so he's been led to believe.

Bitten on Both Wings by squirrelofcelestialintent [Explicit, 31k words]

You may have seen The Little Mermaid, but you have no idea how the real story goes. Castiel is cursed. He comes from a long line of cursed Mer, not that he’s ever met any of them, or been told anything about the burden that he inherited. When he saves a human man from drowning, he finds himself suddenly on land and wearing two legs. It feels like an adventure. And when that man turns out to be someone he might love, there’s no risk he wouldn’t take to be able to stay with Dean. But Castiel doesn’t know what it is that he’s risking.

Breathing Into You by casblackfeathers [Explicit, 110k words]

‘Beware the deep sea, that’s where the monsters come from.’ Dean had heard these words since birth, his father’s warnings shaping him into the man he is today. That’s not the root of Dean’s hatred for merpeople, though. Twenty years after the day tragedy had touched the Winchesters’ lives forever as well as the end of the Great War between humans and mer, Dean is still haunted by that moment. But loving the sea is just as much a part of him as the dread for the merfolk, so when he isn’t working at the local bar, he is there, underwater, immersed in the vast blue his mother used to speak of in her bedtime stories. Dean knows, however, that the sea can be as ruthless as it is soothing. When he is caught in the middle of a storm and faces the anger of the waves, the mysterious appearance of a stranger with blue eyes as clear as the waters Dean loves losing himself in forces Dean to question the truth behind his father’s old mantra.

Here We May Be Free by FriendofCarlotta [Explicit, 39k words]

When Dean was eleven, he saw something in the ocean: a boy with blue eyes and iridescent scales. Almost twenty years later, a spontaneous detour after a hunt brings Dean and Sam back to the town where that encounter took place. And Dean can’t shake the feeling that Castiel, the owner of the local Mermaid Museum, looks familiar…

Hold Your Breath by camwelgrace [Explicit, 151k words]

The summer after Dean Winchester's high school graduation doesn't seem like it's going to be a very exciting one. Dean's life consists of working for Bobby at the salvage yard, taking care of Sammy, and helping his dad run the motel. That is, until a violent storm washes up a dark-haired, blue-eyed merman into The Beach Bunker's pool. With Castiel on land and sporting a brand new - albeit transient - pair of legs, the two of them discover that there's a lot for them to learn from one another. Not only about themselves and their present, but also about the past. Or, The one where Dean Winchester can't believe he's falling for the hot merman who got washed up in his pool. Since when was his life so friggin' weird?

Song of the Sea by Faster_Than_the_Speed_of_Sound [Mature, 37k words]

In a world where the merpeople of the ocean are known by humanity, but sirens are thought to be extinct, Dean Winchester is in trouble. On a routine hunt with his brother, he manages to get himself captured by a group of fishermen who sell him to scientists for experimentation. Dean finds himself locked in a tank hundreds of miles away from his home, with no allies and no conceivable way to get back to the ocean. Just when Dean thinks he has no chance of escaping alive, he finds a friend in the kind, blue-eyed doctor named Castiel. As Dean tries to survive in the facility, he finds salvation, safety, and maybe a little more in his new ally. In the frantic rush to break Dean out and get him back to the ocean, is there any chance for the budding attraction between the siren and the doctor to thrive? Or will it be doomed to a watery grave?

Out of the Deep by riseofthefallenone [Explicit, 488k words]

Stay away from the light-beds. Stay in the deep. It is the first thing hatchlings are taught the moment their fans unfurl and they can swim without their parents to buoy them along. It is the first rule, the first law. It is the beginning of every boogey-monster bedtime story told when they settle against the cliffs to sleep. Castiel should have listened better.

Wish I Could Be by EllenOfOz [Mature, 51k words]

Chapters: 1/1 Fandom: Supernatural (TV 2005) Rating: Mature Warnings: No Archive Warnings Apply Characters: Dean Winchester, Castiel (Supernatural) Additional Tags: Mentioned Sam Winchester, Mentioned Jessica Moore (Supernatural), Alternate Universe - Canon Divergence, Season/Series 01, Post-Stanford Era (Supernatural), Case Fic, Scared Dean Winchester, Possessed Dean Winchester, Guilty Dean Winchester, Creature Castiel (Supernatural), Ghost Castiel (Supernatural), Possessive Castiel (Supernatural), Castiel Possessing Dean Winchester, Possession, Non-Consensual Possession, Scary Castiel (Supernatural), Evil Castiel (Supernatural), Angst, Hurt No Comfort, Ambiguous/Open Ending, Unhappy Ending, Suptober (Supernatural), Suptober 2025 (Supernatural) Series: Part 24 of Suptober 2025 Summary:

The hunt was supposed to be routine. But in the dead silence of an ancient cemetery, Dean finds himself facing a presence that doesn’t want him gone — it wants him for itself.

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Suptober 2025

Chapters: 1/1 Fandom: Supernatural (TV 2005) Rating: Mature Warnings: No Archive Warnings Apply Relationships: Castiel/Dean Winchester Characters: Dean Winchester, Castiel (Supernatural), Sam Winchester, Men of Letters Organization Members (Supernatural), Demons (Characters) Additional Tags: Alternate Universe - Fantasy, Creature Fic, Creature Castiel (Supernatural), Dragon Castiel (Supernatural), Man of Letters Dean Winchester, Man of Letters Castiel (Supernatural), Human Dean Winchester, Non-Hunter Dean Winchester, Protective Dean Winchester, Protective Castiel (Supernatural), Possessive Castiel (Supernatural), Angry Castiel (Supernatural), Castiel is Angry at Dean Winchester, Scared Dean Winchester, Desperate Dean Winchester, Helpful Castiel (Supernatural), Scary Castiel (Supernatural), Dean Winchester is Protective of Sam Winchester, Kidnapped Sam Winchester, Angst, Hurt/Comfort, Angst and Hurt/Comfort, Fantasy, Suptober (Supernatural), Suptober 2025 (Supernatural) Series: Part 22 of Suptober 2025 Summary:

Every secret will swim to the surface and it's only a question of when, not if. And when it does, Castiel won't stop, until he knows every single thing Dean Winchester has been hiding from him.

He doesn't trust him, but he can't say that there isn't something alluring about the man.

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Suptober 2025