Summary: Dean doesn't want her involved in the pending Apocalypse, but she's been with him for three years and she's not leaving him to deal with this alone. Truthfully, he needs her a damn sight more than he lets on. Please R&R!

Disclaimer: I don't own Supernatural or its characters. I only own my Erin Singer. I don't own the lyrics used in this chapter.

A/N: Here's a Dean/OC that's set from 4x01, and I really hope you enjoy it. This chapter contains a little of Dean and Erin's history and also information about Erin.

Hope you enjoy and please feel free to review!

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You're All That I Need

~Chapter One: Back to You~

Twelve Years Ago

Dean had only come to church because John and Sam had asked him to. It was the fourteenth anniversary of Mary's death and John wanted to just go in and say a prayer. They weren't too far away from Bobby Singer's house at this point, and John gasped as he recognised a young girl who was knelt by the altar, a mere two years younger than Dean.

It was Bobby's beautiful daughter, Erin, who was sixteen years old with stunning, silky, thick auburn hair that was a little wavy near the bottom. She had big brown eyes and fair skin, more like her mother in looks and personality but with her father's intelligence and ability to hunt. Her mother had been dead for a long time now, and she was still grieving according to Bobby. John had to smile at the way Dean was looking at her, before the oldest of his children turned to him.

"Who's that, Dad?" He asked, "You know her?"

"Bobby's daughter, Erin." John replied, "I might offer her a lift home in a moment."

Erin stood up and whispered a soft Amen before taking a deep breath and looking to the pastor who nodded to her gently.

"When you're ready, Erin."

The teenager took a deep breath, ready to begin her hymn as she stood near a microphone.

"Pie Jesu, pie Jesu,
Pie Jesu, pie Jesu,
Qui tollis peccata mundi
Dona eis requiem,
Dona eis requiem..."

Dean, John and Sam just stared, all their mouths suddenly dropping open at the beautiful voice that emerged from the girl's lips. She sang the piece beautifully and the other girls in the choir seemed to love the sound of it too as they all smiled at her as she sang. She knew the Winchesters were there but it didn't seem to phase her in the slightest.

"Pie Jesu, pie Jesu,
Pie Jesu, pie Jesu
Qui tollis peccata mundi
Dona eis requiem,
Dona eis requiem..."

As some of the girls joined in with the harmony, Erin had to sing a little louder, but Dean watched the way her full, pink lips moved as she sang and they moved with such elegance and grace he found himself wanting to just go and kiss them. Erin wasn't overly religious but she'd prayed a hell of a lot more since her mother had passed away and she and her father had started hunting. At first, Bobby wouldn't even discuss the idea with her, but eventually, he found that he couldn't fight the stubbornness which he found was so familiar like his own, and he began to train her. At the end of the day, it was what she wanted, and Bobby knew he'd have to keep her as safe as possible.

"Agnus Dei, Agnus Dei,
Agnus Dei, Agnus Dei
Qui tollis peccata mundi
Dona eis requiem,
Dona eis requiem..."

Now, all the girls were singing, and the sound was so gorgeous, Sam had tears streaming down his face while Dean had one falling down his, John with them in his eyes as he understood each word and could translate them from Latin to English. Sam felt an arm around his shoulder as John placed one there, the fourteen year old Winchester leaning onto his father for a little comfort.

"Sempiternam...
Sempiternam...
Requiem."

The last word was sang just by Erin, and the notes drifted through the church, sending shivers down everyone's spines. She just smiled sheepishly and beamed when she saw John meet her eyes. Dean watched her and wiped his eyes, smiling at her as she looked at him which earned him a gorgeous smile back.

That was the moment that Dean Winchester fell in love with Erin Singer.

Present Day

"She could be anywhere, Dean." Sam said, Dean nodding in response and running a hand through his hair.

He'd recently come back from Hell and after meeting Sam they'd returned to Bobby's, hoping that Erin had come back from her previous hunt. As soon as Erin had laid eyes on him she'd barely been able to believe it and bolted in shock. The truth was that Erin had died inside when Dean was killed by that hellhound, and had ended up hunting whatever she could to try and unleash her pain and anger on something that was evil itself.

She'd become lost and pained without him, and Bobby had hated it when he watched Erin just stab a dead creature's body over and over again, bursting into tears as she did. Dean tried to think of where Erin would go. Night had fallen over South Dakota and it was raining outside, heavily too. Erin had run out of the house with just a tank top and her thin jeans on, and in this weather, she could get sick. That was the last thing Dean wanted.

"I'm gonna go look for her." Dean breathed, taking the keys to the Impala, "Call me if she comes back and I'll call you if I find her."

"You got any idea where she is?" Bobby asked, Dean nodding in response.

"If I know Erin like I think I do, she'll be in the church." He said, "I'll start there. Ask if the pastor's seen her."

Bobby nodded and Dean set off desperate to find Erin and promise her that everything was okay. They were trying to figure out what had brought Dean back out of Hell, and as they'd entered Bobby's house, Erin had taken one look at him and just burst into tears, trying to understand before it had all become too much. He pulled up outside the church and saw that the door was partially open, so he grabbed a flashlight and headed inside. He hoped and prayed to God that Erin was in here, that she was alright and she was safe. If anything had happened to her, he'd never forgive himself.

"Erin?" He called softly, stopping as he heard a soft voice singing a familiar hymn quietly and brokenly.

"Pie Jesu, pie Jesu,
Pie Jesu, pie Jesu
Qui tollis peccata mundi
Dona eis requiem,
Dona eis requiem..."

"Erin?" He called again, suddenly spotting her by the altar, curled up on the spot, "Oh, baby..."

Erin looked up at him and started to cry even more, Dean approaching her slowly and seeing that she was soaking wet and trembling. He took his jacket off and went to put it around her, seeing her flinch as he did.

"It's okay," He soothed, "Shhh, it's alright."

"I'm sorry..." She cried, Dean kneeling beside her and stroking her face gently as he pulled her close, "Sorry for running out on you...I'm sorry..."

"Shhh," Dean whispered, "It's okay, Erin. It's alright."

"Is my Dad okay?" Erin asked, Dean nodding in response.

"Just worried sick about you, but I'll let him know you're safe."

Erin nodded weakly and Dean helped her stand, feeling how cold her body was as he wound his arms around her.

"I missed you." She sobbed, Dean smiling softly and leaning closer.

"Missed you too." Dean replied, and even though Erin knew that those words may not be true, she still gained comfort from them and met Dean's lips in their first kiss since he went to Hell.

It was tender, gentle, yet lengthy, and when they broke apart they nuzzled foreheads before hugging again. Dean sighed and the pair began to walk out of the church, Dean getting her into the car before rushing into the driver's seat and kissing her again.

"Come on, sweetheart." He said softly, brushing his fingers against her cheek, "Let's go home."

-TBC-

Hope you enjoyed!

Thanks for reading so far!

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