A/N: Hey guys...

So this is my first sisfic, it's been an idea in the making for 3 years now. I know sisfics may seem over produced, but in the deepest darkest parts of my imagination I see Sam and Dean with a sister. Maybe it's because I'm the only girl out of 3 brothers, or maybe its because half the fandom does too, who knows. I do have to give credit where it is due to River Winters for the inspiration to even try and write this fic, your story was beautifully written and impeccably done. I am both a Sam and Dean girl, DON'T MAKE ME CHOOSE! However Castiel is my guilty pleasure character so there is going to definitely be some intense character pairing between him and the OC.

Disclaimer: I do not own anything already owed by Supernatural, those rights belong to the CW and the great Kripke. I however own the character of Devyn Milligan - if the last name looks familiar it will become apparent below.

Rating: M - for violence, language, sexual content, and possible triggers in later chapters. (I'm only human)...

I'm terrible of summaries, so I won't do any of that here, I'll just let you guys delve in...So enjoy and please R&R below, and please like and follow me and/or the story.

September, 2002 - Windom Minnesota

It was cold September day when John Winchester made his way up the small gravel path of 147 Franklin Drive. The wind was whipping through the treeline, as leaves carelessly fell to the ground below. John pulled the collar of his leather jacket up around his neck, he blew into his chapped hands and shoved them into his pockets hiding them from the elements. As he approached the threshold of the small house a lump formed in the back of his throat that proved almost impossible to swallow. There was a moment's hesitation before he reached out and knocked on the door.

There was a silent stillness about the tiny residence then within a matter of seconds chaos consumed everything. A petite blonde dressed in lavender scrubs opened the door, she looked sleep deprived, her hair thrown up into a perfect messy bun and dark circles forming just under her eyes. She looked down at her watch as the door swung open not even acknowledging the presence of the man standing right infront of her. She glanced over her shoulder for just a second shouting to an invisible person within the house. As she turned her full attention to the man on her stoop her entire countenance changed, and without meaning too she let a small gasp escape her lips.

"Hey Kate…" His deep voice made her pulse quicken as he gave her a once over. He flashed her a smile, that made her melt inside and made her flesh crawl. How could this man hold so much power over her, her breath caught in her chest as she instinctively counted her respirations...yup still alive. She looked over her shoulder into the house and then cautiously around her yard before closing the door fully behind her. With nowhere to go she stood toe to toe with an old flame from the past. She crossed her arms tightly over her chest, she didn't know exactly why she did it. It could be because of the cold, or maybe she was guarding her heart. As a nurse she knew a lot about the human body and how much pain it could take, and much like bones the human heart was the only organ that could break. She was unsure what to do at first so they just stood there in silence, the wind doing all the talking for them...say something Kate, dammit say something she thought to herself.

"John…?" again there was an awkward silent pause, at this rate they would die before the conversation even started. "Um...you look good." She smiled softly, before shaking her head bringing her back to the question that weighed heavily on her mind. "What brings you here?" By now John was a little perplexed himself, he scowled before fumbling around in his pocket revealing a worn envelope.

"Your letter...I, I came as soon as I got it." He said handing the envelope over to her, Her curiosity peaked .

"What letter?" she asked perplexed taking the envelope from him. It was discolored, faded and torn, other places looked as if somebody tried to put together a jigsaw puzzle with masking tape. Turning the envelope over in her hand she realized what it was and became angry. Through gritted teeth and huffed breathes she gave him a tongue lashing.

"John, this letter...this letter was postmarked in September."

"Well, yeah...I mean isn't this September?" he asked with a chuckle, shrugging his broad shoulders.

"Yes it is.." she clicked her tongue in frustration "of 2002!" She held out the envelope mere inches away from John face, his brown eyes adjusting to the closeness of the paper. "This was postmarked in September of 1990!" She thrust the envelope and her hand full force into his chest, his hand covering over hers and the letter instinctively, before she pulled it away. Throwing her hands into the air with frustration and covering her temples taking deep slow breathes.

"Katie…"She cringed as he used ushered out her name, she continued to pace back and forth cursing him under her breathe still rubbing her temples. He tried his best to talk over her incisive rambling. "I'm sorry, I'm sorry that it's taken this long, I know we were never really close, I mean it was only that one time." She scoffed…

"One time is all it takes John, and you're right I would exactly call a one night stand 'being close'".

"I know...but I'm here now." He pleaded. "I got your letter, and I didn't know what to do, dammit Katie it's taken me twelves years to come to terms with the contents of that letter." John stepped closer towards her, his chest against hers. "I'm just asking for a chance...please." He asked, his breath warm on her cheek, she put her hand against his chest and stepped back.

"I don't know John, you're about twelve years too late, and I don't exactly have a whole lot of time to spare these days." She turned around to head back into the house, masking the tears with frustration, John wasn't about to give up. He reached out and gently grabbed ahold of her hand stopping her in her tracks.

"I have to know Kate…"

"I don't know if their ready John, let alone you…". A loud crash from within the house drew Kate's attention else where as a young boy came bursting out the door running into her. John looked down the the sandy haired boy with the blues, he looked so much like Sam did when he was younger. "John, this… this is Adam, he's my son."

"Hi, Adam." John stuck out his hand, the young boy reached out unsure and cautiously shook it before straightening the cap on his head and adjusting the bag he had slung over his shoulder. He seemed slightly uncomfortable, standing there and Kate could sense it. She cleared her throat…

"Adam, you wouldn't happen to know what that loud crash was coming from inside the house would you?" Kate questioned, pointing in the direction of the open door. The boy nervously scuffed his foot on the small patio. "Adam?...the crash?"

"Umm, it may or may not have been memaw…" Kate, looked horrified.

"What, is memaw a cat or something?" John asked quite perplexed about the whole situation.

"Yea" Kate scoffed still looking at Adam. "try someone, memaw was my great-grandmother. Adam here is talking about her urn." she sighed putting one hand to her head and resting the other on her hip. "Adam Milligan what have I told you about running around in the house, you could get hurt...or apparently break something."

"I'm sorry mom, I did clean it up." Adam answered eyes downcast.

"I don't want to know...do I...no, no I don't want too...how?"Adam moved his hand back and forth making small whirring noises. "You vacuumed up memaw?!" Kate was too stunned for words, and John stood arms crossed one hand over his mouth trying to stiffen a laugh.

"I said I was sorry." Adam apologized again, still not making eye contact. With eyes closed and anxiety levels through the roof, Kate struggled to keep her cool.

"I don't have time for this, we're already late, go sit in the car and we will talk about this later. Adam walked quickly face red hot with embarrassment. He only looked up long enough to give a farewell nod to John who for the most part had just stood there silently observing everything go down. Kate turned back toward the opened door, mumbling to herself…"my great grandmother in trapped within my vacuum cleaner mingling with dust bunnies." She reached her hand just inside the open door and pulled her purse off the hanger on the wall. "You sure you still want to get to know them, they are a handful." John smiled, and let out a small chuckle. Kate looked down at her watch, as Adam laid on the horn. John in his mind however kept rolling over one word that Kate had repeated multiple times already 'they'.

"Kate you said they, who's they?" John asked ducking out of the cold, Kate held up her finger and ducked her head back inside shouting to yet another invisible person.

"Devyn Milligan, we're late can we hustle it up please!"

"Kate, who's Devyn?" Again John asked, needing to know.

"Devyn is my daughter...our daughter…" she paused as a small brown haired girl came bounding down the stairs two at a time. "Adam and Devyn are twins."