Dean would probably be very protective. He's always been the big brother looking out for Sam, and with Sam as a kid, that instinct would be even stronger. He'd be constantly worried about Sam getting hurt and would keep him close at all times.
The other hunters in the Supernatural world, like Bobby if he was still alive in the fanfic, would also be worried. They'd offer their expertise and resources to help Dean. Bobby might give Sam some advice on how to take care of Dean while he's unconscious and how to find the culprit.
Dean would probably be extremely confused at first. He might stand there, staring at his car with a bewildered look on his face, muttering things like 'This can't be real'.
In fanfiction, Dean as a Prince of Hell can open up many interesting storylines. One possibility is that his character becomes darker and more conflicted. He might struggle with his newfound powers and the evil that comes with being a Prince of Hell. His relationships with Sam and Castiel would also be severely tested as they try to figure out how to deal with this new Dean.
One great aspect of Castiel and Dean in fanfiction is their dynamic. Their relationship, which is complex in the show, can be explored even further in fanfictions. Writers often delve into their unspoken bond, creating scenarios where they support each other in ways not shown in the original series. For example, some fanfictions might have them going on a road trip together just for the sake of exploring new places and having deep conversations about their pasts and futures.
In Supernatural fanfiction, Dean often has different relationships. His girlfriends can range from original characters created by the fanfic authors to characters from the show's universe in alternate scenarios. For example, some fanfictions might pair him with a hunter from another part of the world, adding new dynamics to his character as he navigates a relationship while still dealing with hunting demons and monsters.
There could be fanfictions where the witches use tickling as a form of torture or interrogation on Dean. However, Dean being Dean, he might find a way to turn the situation around. It could also be a way for the writer to explore the relationship between hunters and witches in the Supernatural universe in a more light - hearted and creative way.
Dean in Supernatural fanfiction is often depicted in various ways. He can be shown as a fearless hunter, always ready to face the supernatural threats. Writers may focus on his relationships with other characters like Sam, Cas or Bobby. His loyalty and his sense of humor are also common traits that are explored in fanfiction.
In many fanfictions, Dean as a Knight of Hell can bring a whole new dynamic to the Supernatural universe. His relationships with other characters, like Sam, would be severely tested. He could be seen as a threat by some and a potential ally by others who hope to control or redeem him.