First story on here. Hopefully the summary explained a little bit about what this is. Dean's children from the future come with a warning...

"Mase, Lee, come here!" Claire called, grabbing the closest blade and sliding it across her palm, hissing quietly.

The two slid into the dungeon as she was finishing painting the sigil made of her blood and various herbs on the wall. Mason began asking questions, but she held a hand up, stopping him midsentence. She picked up the letter she had finished on the typewriter in the other room moments before, blood smearing across it; there was no time for a new one. She folded it and placed it in Mason's hand, smiling at her oldest.

"It's time," she pulled them both into her arms, taking turns kissing their cheeks.

"Already?" Mason whispered, arms still around his sister and mother.

"Yes, I wish there was more time, but the monsters are close. You two need to go," she pulled away from them, "I love you two both, so much. I know this is scary, but… You'll do great."

"Mom-" he started to protest.

"There's no more time to discuss, Mason! We've been preparing for weeks. It's now or never," she interrupted. She scooped up the spell she found folded in a file weeks before. She had been forming this plan since she discovered it.

She read the words quickly, stumbling and stuttering. When the sigil began to glow bright white, the bunker door was ripped open upstairs. She placed her hands on both children and shoved them into the light, sending a prayer up to whoever was left to listen.

Sam and Dean were in the War Room, leafing through an ancient book or twelve, when a bright light filled the room. Dean immediately grabbed for his gun, while Sam snatched up his. A gust of wind knocked the brothers to the floor.

Dean landed just beside the table, still able to see the glowing orb in front of him. He was frantically squinting into the light, searching for a source. A list of possible monsters ran through his head. Angel? Demon? Shit, at this point, it could be anything.

Sam's hair was smoothed back, eyes nearly closed from hitting the wall and knocking his head. When the wind and light began to die down, Dean was the first to see the outline of two people. He cocked his gun, jumping to his feet, just as the light was dissipating.

Mason's vision had been clouded since he and his sister had been heaved through the…well, through whatever it was his mother had written on the wall. When the haze left him, he saw the two men in front of them. He was quick to step in front of his sister, letter in his hand floating to the floor as he held his palms up to the man with the gun.

"Hey, calm down! We're not here to fight!" Mason's eyes were wide, anxiously switching from the two.

"Sam?" Dean didn't look back as he asked his brother if he was okay.

"Yeah, yeah, 'm good," he mumbled, struggling to his feet.

Dean nodded curtly, demanding from the two in front of him, "Who are you?"

"Alright, alright, I'm Mason, this is my sister, Melody," Mason slowly lowered his hands.

"Why are you here?" Dean was still pointing his gun at the two but less tense, noting neither were a real threat.

"Our mom sent us; we, uh," Mason paused, fatigue hitting him in a huge wave. He had time to glance back at his sister to see her faint just before he hit the floor as well.

Melody was first to wake up, hurriedly sitting up from the bed she was in. She tried to move her arms but found them handcuffed above her. She let out a frightened squeak, searching for Mason in the room but not finding him. The room was familiar, somehow. Maybe if there was some jungle wall paper border on the tops and bottoms of the wall and a few framed pictures of jungle animals it could have been her childhood bedroom.

She trembled as the door to the bedroom swung open, forcing her out of her thoughts. She backed up against the bed frame, sucking in a deep breath. Sam eyed the girl closely, shoving his gun into the back of his pants before entering the room. He held his hands up, softly saying, "It's alright. My names Sam; can you tell me why you're here, Melody?"

She shook her head furiously, yanking on her hands again. Sam shuffled, irritated. He took another step towards her, "Melody, you need to tell me why you're here."

She just shook her head again. Sam sighed before pulling the letter Mason had dropped earlier out of his pocket. He smoothed it out in front of her, pointing to it, "Can you tell me what this is supposed to mean?"

It was the first time Melody had seen the letter. She raked her eyes over it, eyes sliding over the words and blood.

5/2/2040

Dean,

This is going to be hard to understand. I wish I could send them to a different time, a time when you know them...and me. But I can't. It's too close. It's too dangerous.

I don't have much time to explain. Those things are close.

Mason and Melody will have to explain most of it. Listen to them, and trust them. I know that will be hard for you. They know very little about you and even less about hunting. Keep them safe, please.

And remember Yellow.

Love you always,

Claire

Melody hesitantly held up her still restricted hand, signing the letters 'M-O-M'. Sam's clearly confused face was enough for her to know he had no idea what she was trying to communicate. She huffed in frustration and tried her best to mime a pen. Sam was tentative as he rummaged through his pocket for the handcuff keys. He let her right hand out and handed her the pen he had found in his pocket also.

She accepted it and flipped the letter over. In gracious handwriting she wrote a small explanation.

I'm deaf. I can't hear you. This letter is from my mother. Where is Mason?

Sam's face flushed, suddenly feeling self conscious for not realizing she was signing to him. He had read a few ASL books while at Stanford. Jess had had a deaf cousin who visited often. He didn't know much, but he faintly recalled some of the alphabet. He gently took the pen from her hand and scribbled an answer.

He's safe. You both are. This date has to be wrong. It's 2014.

It will sound crazy. Mason will be better at explaining. I need to see him.

Just try.

Mason and I are from 2040. Our mom sent us back to tell our father about the year. She found a spell. I know it sounds crazy, but it's the truth.

Sam stared at her for a few moments before taking the letter and pen with him as he left the room. Melody began trying to yank her hand free of the cuff; Sam had freed her of one already. By the time the door opened again, Melody had succeeded in nothing but making her wrist red and tender. She was pleased to see Mason come in the door instead of Sam.

Mason quickly sat next to her on the bed and signed, 'Are you okay?'

'Yes, where are they? Are we okay?'

'Let me free you. I will explain everything.'

Mason set to unlocking her cuff; Sam had given him the key. When she was free, she rubbed her wrist while Mason explained. While Sam had been 'interrogating' her, Dean had been questioning him. Mason managed to explain and convince Dean that they were, indeed, from 2040. His fast forward in time earlier in his life allowed him to be a little less skeptical about time travel.

Dean, however, was very skeptical about them being his children. Mason was finding it difficult to prove it to him, because he had never paid attention when his mother told stories about his father and uncle. Mason was explaining how important it was that Melody try to retell some of the stories their mother had told her to Dean and Sam, when there was a knock on the door.

Mason got up to open the door and gestured for Melody to follow him out. They sat down at the War Room table, across from Sam and Dean. Mason signed, 'Can you tell them some things Mom told you?'

Melody nodded and began signing quickly. While she signed, Mason translated to the men, "Mom stopped telling stories when I turned sixteen. She said it hurt too much to remember you," Melody's eyes were fixed on Dean as she signed; Mason watched his sister closely, not missing a word as he continued to speak, "She told me about your obsession with pie and your car. She said you called it your baby and treated it with the same respect you would a classy lady," Melody had a faint smile on her lips as she signed.

"She told me my Uncle Sam was a Stanford student for awhile, and he had his eyes on a pretty girl named Jess. Mom said she would have loved to meet her. She only saw pictures," Sam tensed up at the mention of Jessica but didn't interrupt.

"We live in this place, actually. I'm surprised it looks so similar to what we have. Mom never wanted to change anything. She didn't explain what it meant, but she said it use to belong to the Men of Letters," Melody paused.

"Anyways, it was always stories about little things. She never told me anything about hunting. Mason and I had to find that out on our own. We found our grandfather's journal; Mom was pissed we were snooping around. Then we," Melody had paused, her hands pausing.

Mason reached a hand out to her shoulder, 'It's okay. Go on.'

She nodded, "Then we found our dad's journal. Or, I guess, your journal, Dean. Mason didn't want to read it. He didn't really remember much of you. I was curious to learn about the man I never knew. I was surprised to see it was nothing about the supernatural. It was all advice. Advice for his kids. It was all about how to get the ladies, treat them right, know the difference between a keeper and a one night stand for Mason. And for me, it was about never letting a guy treat me wrong, getting an education, and never to rely on a man to support me. I never told Mason about it, or Mom for that matter. I thought it would make them mad."

And, in fact, Mason was angry. Angry she had kept such things from him and angry Dean wasn't there to tell it all to him himself. Melody didn't know what else to say so her hands had fallen to her lap. Dean and Sam were quiet until finally Dean shifted, saying, "What's Yellow mean?"

Melody was quiet, and Mason had no clue. Dean laughed, crossing his arms across his chest, "So the one clue your "mom" gives to me to remember her, and you two don't even know what it means?"

Mason didn't sign for Melody this time, but she could see the sarcasm in Dean's body. She reached for the letter that was thrown in the middle of the table, the pen on top of it, and quickly scribbled out a few sentences. She shoved the paper across the table to Dean, so he could read her writing.

Yellow is the song you hear when you see her the first time. And it's the song you dance to at your wedding. And it's the song she plays when you die.

Dean was quiet while he read the few lines. He looked up and over at Melody, merely nodding. He folded the piece of paper up and slid it into his jacket, not letting the other two see it. It was still in the room until Dean blurted, "How did you, uh… Y'know?"

Melody was used to this question. It brought a sad smile to her lips while Mason answered for her, "She suffered from a severe case of meningitis when she was a baby. She's never, um, heard anything, really. Some people can speak, even though they can't hear. She never really learned how to speak, so her vocal cords have a lot of damage."

Abruptly, Dean hopped up from his chair and left the room. Both children knew where he was headed, being there only one room that way – the kitchen. Neither Melody or Mason said anything, but before Sam got up to follow his brother, Sam signed, 'Thank you'.

While the two men were gone, Melody and Mason ventured through the bunker. In 2040, it is their home. Melody sleeps in the room she woke up in, her jungle theme still intact from when she was a baby. Mason sleeps in the room that once was Sam's. It's bare, clean and uniform, just as Sam left it. Their mother sleeps in Dean's room, all of his decorations hung up and framed.

It was weird for the children to see things so similar, yet so different. The most different and frightening thing was the technology, especially when they wandered into Sam's room and spotted his cell phone. Mason was first to pick it up, and when it began ringing in his hand, he nearly dropped it. They found the dungeon behind the walls and were surprised to find it the same as they had it in 2040. Demon warding doesn't really change, though.

By the time they were back in the War Room, Dean and Sam were back with another man in tow.

"Are these the children you told me about, Dean?" Castiel questioned

Dean merely nodded his head. Castiel took a step towards Mason and Melody, eyes switching between the two. Mason looked towards Sam and Dean when Castiel took another step forward. Sam encouragingly said, "It's alright; he's a friend."

Castiel stared at Melody, right through Mason, and Melody 'heard' Castiel say, 'You lost your hearing when you were a baby.'

Melody didn't say anything, or sign anything for that matter. She stared at Castiel, head cocked the side, and nodded. He continued, 'Do you wish for me to fix your hearing?'

At her nod, he took another step forward. Mason quickly stepped between the two, but when Melody placed a hand on his arm, he moved to the side. Castiel pressed his two fingers to her forehead, her eyes fluttering close. In a matter of a few moments of blinding pain, Melody opened her eyes again. Instead of inside her head, this time she watched Castiel's lips move and she heard him say, "Is that better?"

Melody's eyes immediately began to well up with tears. Mason grabbed her arm and turned accusatory eyes on Castiel, "What did you do?"

"I fixed her hearing," Castiel answered, perplexed at the hostility from Mason.

"You what?" Mason balked, turning to his sister. "Lee?"

"I-I," Melody swallowed quickly.

"I should…" Castiel reached forward and pressed his fingers to her throat.

Melody swallowed thickly once more before forcing out the words, "Th-ank y-ou."

"What are you?" Mason demanded.

"My name is Castiel, and I am an angel of the Lord," Castiel smiled smugly, stepping back to Dean, proud of himself.

"Thank you, Cass," Dean muttered under his breath.

Melody was hesitant to speak, but she stuttered out, "W-why?"

"Because," Dean chose his words carefully, "Because if you are my kid, then I want to help you. And having an angel at my fingertips that can fix," he gestured towards her, "then why not?"

"She wasn't broken," Mason interjected.

"I didn't mean it like that—"

"I underst-stand," Melody cut off his rambling. She gave him a small smile, signing 'thank you' before she could stop herself.

"How, how do I say 'you're welcome'?" he asked her.

She showed him the gesture, and he copied her. Mason watched their interaction from the side, pissed. He coughed, bringing attention back to himself, "We need to talk."