I remember reading a fanfic called 'Castiel's Wounds'. In this story, Castiel is severely injured during a battle with demons. The fic focuses on how Sam and Dean try to help him recover, and the relationship dynamics between the three are really well - written. It shows Castiel's vulnerability in a very believable way. There's also 'A World of Hurt' which explores Castiel's hurt in a post - apocalyptic setting, adding an extra layer of tension and drama.
There's also a story where Castiel kidnaps a fan in a desperate attempt to save the world. It's a complex plot that involves time travel and alternate universes. You can find it on FanFiction.net. The story really delves into Castiel's character and his motives behind the kidnapping.
I really like the fanfic 'Castiel's Endless Burden'. It shows Castiel constantly feeling the pressure of being different from other angels due to his relationship with the Winchesters. It's a story full of angst and self - discovery for Castiel, and the way it's written makes you feel his pain.
One great Castiel - dead fanfiction is 'The Aftermath of an Angel's Fall'. It really delves into how the other characters in Supernatural deal with Castiel's death. It shows Dean's inner turmoil and Sam's struggle to come to terms with it.
I really liked 'Castiel's True Soulmate'. In this fanfic, the author creates a unique take on what it means for Castiel to have a soulmate. It has some really interesting plot twists that keep you hooked. There are also some great character interactions that stay true to the show's essence.
There's also 'Dean's Unseen Shield'. Here, Castiel's protection of Dean is more of a silent, behind - the - scenes kind of thing. He uses his powers in a very discreet way to keep Dean out of harm's way. The fanfiction is unique in that it shows the subtleties of their relationship and how Castiel's love for Dean manifests in his protective actions.
There is also 'Castiel's Choice'. This one is interesting as it focuses on Castiel having to make some tough decisions that directly impact his relationship with Dean. It's full of emotional moments and really makes you think about the depth of their connection within the Supernatural universe.
I really like 'A Meeting of Opposites'. In this fanfiction, the author explores the idea of Castiel and Meg having to work together on a mission. It's a great read because it plays with their personalities. Castiel's naivete and Meg's cunning are both highlighted and as they interact, it creates a lot of tension and some really cool plot twists.
One great fanfiction is 'Heaven Can't Wait'. It beautifully explores the relationship between Dean and Castiel. The story delves deep into their emotional bond, with vivid descriptions of their shared experiences and how they rely on each other. It also has some really exciting action scenes that are in line with the 'Supernatural' universe.
A popular fanfic portrays Castiel as Dean's constant shadow. He follows Dean everywhere, using his powers to prevent any harm from coming near. Whether it's a simple bar fight or a major supernatural battle, Castiel is there, with his wings spread wide to protect Dean.
Yes, there are plenty of non - inappropriate Supernatural Castiel fanfictions. Many fans write stories that focus on his relationships in a positive, platonic or heroic way. For example, there are fanfictions about his loyalty to Dean and Sam, or his adventures in the Supernatural world that don't involve any inappropriate content.