Never thought I'd meet my never born sister in a KC Bar.

John Winchester has had a lot of lovers in his past. When one has a daughter then dies what happens to their daughter? Can John step up or will he leave?

AU - Sam and Dean have a younger sister. Months after a traumatic incident, Dean must help her work through her fear and accept her imminent motherhood.

Sadie Winchester, Dean Winchester's twin sister, and Sam Winchester's older sister, becomes best friends with a demon. Falls in love with an angel. And is somehow important in the role of stopping the apocalypse. What's in store for this unfortunate family?

Sis!fic, wincest, no slash! when John brings home a small bundle from a one night stand, Sam and Dean develop something more for their baby sister, something that makes them feel wrong, something that makes them hers. S/OFC D/OFC D/OFC/S REVIEW 4 MORE

So this was going to be posted in December but I never got to it. This is a Christmas fic that has/ends with Destiel, yes it has an oc but she is not a love interest just a sister/sister-figure.

For this we will say that Dean and Sam learned of Adam at the same time that John did. John told his sons of their brother. So when their dad goes missing and Dean picks up Sam to help him go look they make another stop on the way to pick up their baby brother Adam who is not quite 16 yet. Also Trinity comes back into the family business. WARNING: Spanking of teens

Yes, I know I it's another sister story, whatever. This is what happens when the Winchester boys find out they have a sister.

Uum...So...This is my favorite series...and I will have numerous book on it...Each book will be an "Episode". This one is about Dean and Sam finding a girl who claims to be their sister. I hope you like it!

In these dark times, she will be there light. A sister fic.

What if Sam and Dean had a sister that only Dean knew about? And what if that sister was actually Sam's twin sister? What if they ended up on a job with her? And what if she went missing? How would they react when it came to it?

Ok. In the future Dean's little sister Sammy's twin sister Allanna and Dean's gaurdian angel Castiel who has been abandoned by his brother and sisters in heaven hook up and have a kid.

Supernatural siblings story. The guys have a sister.

What if Sam had a sister? What if his sister had a secret? Sort of AU. Some chapters are rated T others rated M. Mention of rape, non-con, and abuse. NO SLASH! NO WINCEST EITHER!

Dean and Sam got a new sister, John took her in and they couldnt stay away from this beautiful little girl. They have dreams and touch her hair, they both want her and she encourages it. They feel more for their sister. D/OC S/OC D/OC/S sis!fic

It is Dean and Sam's adopted sister, Emma's 18th birthday...

Sister FIC! Sam, Dean, and their sister Daina travel to Mystic Falls to investigate the dissappearances of some young locals. They get stuck in a bigger problem than what they expected. Sorry! Bad summary!

Sam and Dean get a phone call from one of John's lovers, they go visit her and find out that they have a half sister who has a weird gift. Will Sam and Dean grow closer to their sister or will they just let her go forever? Please and read and review!

If the Winchesters had a sister and Lucifer wasn't a dick just misunderstood.

Series of one shots...Sister fic that has nothing to do with the sister...Basically a look at the Winchester life from an outsider looking in.

What if Sam and Dean had a sister they left behind

What if Sam and Dean had an adopted sister? This is part one in a three part series.

...she's my sister, man.

My own twist on the Winchester story. See how their little sister deals with having two older brothers while living a life not most could, while trying to keep a secret that could possibly get her killed. It's a crazy life for Andi Colt Winchester. Over protective brothers, no real privacy, ghosts, demons,monsters, crappy hotel rooms and spiders in the bathroom. Whats a girl to do?

Polly asks Dean about the birds and the bees.