Here's a new story I've been messing with, it will continue sporatically as I have time to publish it. The characters will be slightly OCC, but I need them that way to work. This takes place pre-season one of Supernatural and also pretends that Benny isn't stuck in purgatory.

Disclaimer: I don't own anything of Supernatural, just the story idea

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Dean was running through the night, trying to escape the things that were chasing him through the streets of New Orleans, whatever they were, they were trying to get him to come with them, they had done something last night, Dean knew. He had gotten drunker than he thought and woke up with the four men surrounding him and a horrible pain in his throat. He fought and ran. He knew he wasn't going to last much longer though. He could feel himself falling slower and his mind getting foggier. Right when he thought that they would catch him, Dean stumbled face first into a solid, if cold, body in front of him.

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Benny had just gotten off work at the bar he was cooking at during the evening. It was just early enough that there weren't very many people out. He wasn't using his senses to their full extent when he was wandering, not worried about hunters or anything since he hadn't killed anyone and didn't know of any local activity. Benny had just turned his head to catch a glimpse of the French quarter through the side streets when a body slammed into him. Benny reflexively caught the person, and looked down at who hit him. It was a frickin' kid, and if his nose didn't lead him wrong, a hunter that was running for his life at that. Now normally Benny didn't care what happened to hunters, but this one was just a kid, he can't have been in for very long. Benny pulled the kid behind him and turned to the four that stopped in front of him that were chasing the kid. They weren't human whatever they were. They immediately took a fighting stance and went to see in they could intimidate Benny. They apparently didn't know he was a vampire. "The boy is ours" the one in the lead hissed out. "we turned him to be ours, when he mates with one of us the future of our species is secure." That had Benny raising his eyebrows, even as the kid shivered behind him "Y'all are mer aren't ya? What about the kid's choice. Did he choose one of you? Or even to become one of ya in the first place?" The leader hissed again "It matters not, once the child is mated his human memories will fade. We choose those who reek of fear and sadness, his human life ending should be a blessing. We did no harm, and only seek to help the boy." Obviously the "boy" didn't see it that way if the shaking of his head was any indicator.
Benny made his decision, he didn't want to take away the chance of the mer to repopulate, but he couldn't let the kid get turned into a glorified breeding bitch either. Benny grabbed the kid's arm behind him and still facing the mer in front, showed his teeth. "well, ah haven't had a decent meal in quite a spell and the four of you and the little bit should work quite well" then he grinned. The fangs and the implications were all it took to make the mer back off. They might have wanted the boy, but not enough to risk dying for him. Benny turned back to the kid just in time to catch him as he passed out. He could tell that the kid was still in the middle of turning and needed water fast. It wasn't going to end well otherwise.
Dean woke up in a shallow pool of water. It took him a minute to realize how he got there. The last thing he remembered was running into the guy that saved him from the ...mer? he called them? Finally he had the gumption to look down. He gulped, instead of the normal bow-legs he'd had forever, there was a green and gold tail starting from below his bellybutton , granted the gold scales with the iridescent green and slight blue on some tint on the tips looked good...but something he was expecting to see in a fish tank, not on him!
Dean felt like he couldn't breathe, he looked around and realized that his head had been underwater the entire time he was unconscious, now that he had woken up, his head and most of his torso was above water. Dean crashed back down and tried to focus. It was a lot easier now that he could feel the water flowing about his ribs...and what he figured were gills...he didn't have the courage to actually find out yet though. He was still dealing with that last night...he hoped it was last night anyway, had really happened. He shut his eyes as he tried not to cry, he couldn't do it. As soon as he found out where his clothes and his gun was he was going to save his Dad the trouble of putting him out of his misery. Worse yet was Sammy somehow finding out, he huffed, that would ruin his "Apple Pie" life for sure. He closed his eyes against the tears he just knew were there.
Dean must have fallen asleep again, because the next time he opened his eyes, the bright glare of day had changed to muted orange. He blinked his surprise at still being in the pool, he half expected someone to have come and put him out of his misery already. "You awake now chere?" a voice over his head spoke. Dean flinched and looked up, there was the same guy that had saved him from the rest of the mer. Dean was shocked the guy hadn't run off, seeing as how he had a tail and all. Dean nodded numbly, looking at where the guy was carrying a tray of breakfast in his hands. The guy moved the tray and nodded towards Dean, "want some breakfast?" Again Dean nodded, not sure what was going on, but feeling like the stranger was all that was keeping him together.
Dean pulled himself as far out of the water as he could get, assuming he was going to have to eat quickly to be able to get food down and breathe at the same time. The man put a hand on his shoulder "Whoa now, just a second chere. Let's get you fully out so you can change back." Dean looked at him confused "You're a Mer now sugar, but that don't mean that you can't have legs as well as fins. I've seen mer before so I can help you out. You just need to trust me here." Dean nodded again mutely. There was something about this guy, but Dean couldn't put his finger on it. He would just trust him for now.