Disclaimer 1: I do not own Supernatural and am not making money by writing this story.

Disclaimer 2: The title is from the song, Chasing Cars and I am not making money by using it as the title of my fanfic.

Chapter two

Spring 1999

As time went on, Naomi kept bringing Castiel over. She would leave him with Dean and Mary for quite some time while going of to do some errands.

Both boys were always happy to see each other. They loved to play with each other; it didn't matter what game it was as long as they were together. When the time came for Castiel to leave, neither wanted to part. Their protests would sometimes lead both mothers to exasperation.

Before they knew it, winter had faded and spring had taken over, its bright colors brought warmth and joy to many people, including the Winchesters.

One day when Mary Winchester was out on a walk with her baby, she had an epiphany as she kept catching Dean smile whenever he stared up at the clear sky.

"Spring's your favorite, then?" Mary had leaned down closer to Dean and kissed his forehead.

Dean gave a giggle. Mary's heart almost exploded right there. Even though she had heard that sound many times before and was supposed to be used to it, she knew that that would never occur. The joyful sounds her baby made would never stop making her happy.

Later when Mary was chopping vegetables, she realized that the bright blue sky was a reminder of Castiel and therefore, was probably the reason for Dean's happiness. She smiled to herself as she thought it over and then got back to finishing the dinner.

Fall 2002

When the time came for Dean to start pre-school, Mary had to deal with a big fuss.

"If Cas isn't going, I'm not going too!" Dean pouted.

"Honey, it's up to the Miltons to decide when Cas goes to pre-school. I can't make him go if they don't think he should." Mary tried to explain.

"I don't care, I don't care, I don't care!" Dean yelled and walked around in circles. Mary sighed and decided to call Naomi.

It turned out that Castiel was going to start his first day as well and was putting up the same fight. After conversing for a while, both mothers came up with a plan. Naomi asked Castiel to get on the phone and Mary then handed the phone over to Dean. Once he talked to Castiel, Dean relaxed and let Mary put his coat on.

Later that day, when the Winchesters were eating dinner, Mary noticed that Dean was frowning. Actually, he seemed gloomy ever since he got back from school. At first, she put it off as tiredness but then how tieed could pre-schoolers really be?

"What's wrong, Dean?" She asked while passing John the butter.

"Nothing." Dean shook his head and took a bite out of his chicken.

"How was your first day of school, champ?" John said while chewing.

"John, that's gross, can you please not talk while eating?" Mary asked but gave a small smile indicating that she wasn't as disgusted as she was concerned.

"Yeah, daddy, you could choke!" Dean had woken up from his daydream.

"'orry, guys." John swallowed and then took a sip of his drink. He glanced over to his son and noticed that Dean still had a frown on his face. He exchanged a concerned look with his wife.

"How was your first day of school, sweetie?" Mary repeated her husband's question.

"I don't want to talk about it."

"Did you have fun with Cas in school?" Mary asked hopefully.

Dean tore his face from his plate and when he looked up, Mary noticed that tears had welled up in his eyes.

"Baby, what's wrong?" Mary asked gently.

"He wasn't- Dean's lip trembled. "- in my class."

"You guys were put in different classes? But you can still see each other during recess, can't you?" John asked, hoping to lighten the mood.

At that, Dean started to cry and Mary came up and hugged him. When he calmed down, he finally told them the whole story. It turned out that some boys had called Dean and Cas, "gay babies" because they were very upset when they were forced to part from each other.

And when Dean finished his story, he widened his eyes and asked his parents what gay meant.

Mary said, "It's when a woman falls in love with a woman or when a man falls in love with a man."

"So I'm gay." Dean said with a small smile.

Mary and John exchanged glances.

"Why do you say that?" Mary asked curiously.

"Well because I love Cas very much and I'll marry him one day." Dean said proudly.

Mary laughed.

"I will, mommy!" Dean had a determined look.

"Okay, honey. Just remember, we'll love you no matter who you decide to marry." She said and gave John a pointed look.

"Yes, we will." John nodded in confirmation.

Winter 2003

Dean was four years old when he find out that he was going to be a big brother. After a few curious questions, his parents decided to sit down and explain to him why his mommy's belly was getting big. When they finished talking, they smiled at Dean expectantly.

Dean nodded and said he understood but didn't let on that he was quite upset. He didn't want a little brother; what if his parents didn't love him anymore? He thought that his brother would take them away from him. So when nighttime came, Dean decided to do the first thing that came to mind. He packed a bag, snuck out of his house, and headed over to Cas's house.

It wasn't very late so he hoped that the Miltons weren't sleeping. He sighed in relief when he saw the lights were still on and rang the doorbell. Anna, Cas's older sister, opened the door.

"Hey dork. What do you want?" She had an annoyed expression on her face. She never been nice to him. Dean wondered if all girls were like that or if that was yet another phase Anna was going through.

"Move out of the way, meanie." He tried to move past her but she didn't let him. Dean had to admit that for an eight-year old girl, she was quite strong.

"What do you want?" She asked curiously while twirling a strand of her hair.

"Where's Cas?" He said impatiently.

"Taking a bath." She said and noticing the sour look Dean was sporting, she softened her eyes and added, "Why? What's wrong?"

"Nothing, I just wanted to see Cas."

It looked like Anna suddenly had a change of heart because then she said, "Okay, fine, you can come in."

After ten minutes of waiting, Castiel appeared in his pajamas and bathrobe. When he noticed Dean sitting on the couch in his living room, his eyes shone brightly.

He sat down next to Dean on the couch and said, "Why are you here, Dean?"

Dean didn't say anything. Instead he grabbed Castiel and pulled him into a hug. Castiel, not knowing how to react, hugged him back. He didn't need to question Dean, he was quite used to Dean's abrupt hugs.

"Castiel, the Winchesters called. They said that they can't find-" Naomi trailed on when she entered the living room, "- Dean."

"Your parents are very worried, young man!" She said sternly narrowing her eyes.

Dean refused to meet her eyes and looked at the wall instead. Castiel noticing his friend's mood, said, "Can Dean stay for supper, please?"

When Naomi said nothing, Castiel, added, "Please, it won't be for long. Please, mom." He gave her the puppy-eyes.

Naomi looked between them and said, "Oh alright." She called Mary and John and asked them if it was alright that their was son would stay over for supper. They agreed as long as he would be back within a few hours. After hanging up the phone, Naomi went to the kitchen to prepare supper.

"Where's your dad?" Dean asked.

"I don't know." Castiel said quietly and looped a finger through a small hole on his pajama pant.

"Probably at work. Mom says he really likes his job." Anna had plopped herself on the couch and turned on the T.V.

While Anna flipped through the channels, Castiel turned back to Dean and decided to continue their conversation.

"Why are you here, Deanie?" Castiel said.

"Don't call me that."

"Why not?" Castiel asked incredulously.

"It makes him sound like a baby, that's why." Anna said not taking her eyes off the screen.

"Shut up, Anna." They both said simultaneously. Anna smirked and said, "Aww, you're adorable." She reached over the couch and tried to pinch Castiel's cheeks but he got away just in time. He scowled and narrowed his eyes but she just laughed and turned her attention back to the T.V.

Dean knew that Castiel would never give up so he decided to tell him.

"My parent said that I'm going to have a brother." Dean's words dripped with disdain.

"Isn't that a good thing? We'll have another friend." Either Castiel couldn't hear Dean's disdain or maybe he wasn't listening, Dean wasn't sure. But Dean had to make sure his friend understood his worrying.

"No, it isn't!" Dean said, fury evident in his voice.

"Why?"

"What if my parents decide to leave me for him?" Dean said quietly.

"That wouldn't happen."

"How do you know that?"

"I know that your parents love you very much and they wouldn't want to leave you." Castiel said and then added, "And you'll be a great brother, Dean."

"Really?" Dean asked questioningly.

"Yep, the best brother!" Castiel said and smiled cheerfully.

"And you'll be the one in charge so you'll be able to torture them." Anna smiled slyly at Castiel.

After a few minutes of conversation, Dean decided that having a brother wouldn't be so bad. He was actually getting excited when Naomi came in and called them to eat. Anna shut the T.V. off and the three of them raced to the kitchen.

Once he had finished eating, Naomi called Dean's parents and they came to pick him up. His parents sighed in relief when they came to pick him up. They said good-bye to Naomi and her children and then went back home.

"You had us worried, Dean." John said carrying Dean.

"I'm sorry." His eyes were drooping and hugged John tightly.

"Promise me that you won't do that again." Mary said sternly.

"Promise.." His voice was drifting, which was sign of tiredness. Within minutes, they arrived at their home and Dean was soon put to sleep.

May 2nd, 2003

Sam was born on May 2nd, 2003. A day before the event, Mary was rushed to the hospital. Dean wasn't permitted to go with them so he had to stay with the Miltons. He was pretty sad to be separated from his family for quite a long time. He supposed that spending the time with Castiel was an upside, though.

At exactly seven p.m., John called and told Naomi that Dean now had a little brother. Dean being his usual sneaky self, was actually listening in on the phone conversation and had momentarily forgotten that no one knew he was on the phone and said, "What's his name, daddy?"

John didn't comment on Dean's spying. He just laughed and said, "Sam."

"Can I meet him?" Castiel had walked out of the bathroom had overhead the conversation and yelled in the phone, "Me too, me too!"

John laughed and said, "Alright, you can all meet him." After getting the directions and making sure that everyone was properly dressed, Naomi drove them to the hospital.

When they finally got the directions to Mary's room, Dean couldn't contain his excitement. Neither could Castiel, though his reasons were a bit different. Yes, he was excited to see the baby but he was also excited about the fact that Anna wasn't there and that he would be able rub it in her face that he'd gotten to see Sam before she did.

Upon entering the room, Dean saw that his mom was asleep. His father, however, wasn't. John was sitting in the chair and holding something very little wrapped in several blankets. Dean was pretty sure that it was Sam.

John looked up when he heard noises and upon seeing Dean, his eyes softened his eyes and said, "Come meet your brother, Dean."

Dean walked hesitantly toward John and when he stood right next to his dad, Sam's eyes flew open and his little fingers flailed, as if searching for something, or rather someone. Dean linked his fingers with Sam's and said, "He's so small."

"Don't worry, he'll be big in no time." John laughed. Then his face grew serious and he said, "You're a big brother now, Dean. You'll have to always be there for him."

"Can I hold him?" Dean asked.

"Sure, bud. Just be careful." Dean sat down and John carefully handed Sam to him.

At that moment, Mary woke up and smiled upon seeing her family. When she was fully alert, John went outside to see Naomi and Castiel, who weren't allowed to come in seeing as they were not family. John noticed that Castiel seemed to be very upset about this so he decided to try to pull a few strings.

While that was going on, Dean was still holding Sam. He looked down at Sam's face and said, "So you're my little brother, Sammy." Sam's stare intensified.

"Don't worry, I'll always be there for you." Dean said and smiled at Sam.

After a few minutes, Castiel emerged in the room and upon seeing the baby in Dean's arms, he exclaimed, "He's so small."

"Castiel." Naomi said warningly.

"Don't worry, Dean said the same thing." John laughed while Castiel went to seat down next to Dean. He made funny faces, expecting a response but was disappointed to see that Sam wasn't really responding. In his opinion, babies were pretty boring.

After taking a million pictures and having some lunch, Naomi left with Dean and Castiel. John promised that they would come back that night. Dean didn't want to leave but he knew he had to. He knew that his parents would eventually come home and he couldn't wait for that because it meant that Sam would be coming home with them.

November 2nd, 2003

A few days after Sam turned six months old, a fire broke out. John handed Sam to Dean and told him to run outside and to never look back. Dean tried to protest, wanted to go back and save his mom but John hushed him and went back into the house by himself.

Before she took her last breath, one thing occurred to her: she would never hear her baby's beautiful laugh again. Sam's laugh had always made her happy but it didn't quite have the same effect as Dean's did, once upon a time. She knew that she should have felt guilty but it wasn't like she loved either of her sons more than the other.

There was just always a feeling in the pit of her stomach that made her feel a bit more protective and nourishing towards Dean than she probably should have been. She couldn't place what it was that made her feel that way.

During the funeral, John didn't say anything but Dean could tell that his father was hurting inside. He knew that he couldn't do anything to make it better though. So he just held Sam tighter, kissed his forehead and promised that he would always be there for him, no matter what happened.

A/N: Please review.

Thank You,