Summary: AU. They're only related by marriage, so is it really wrong? PLEASE REVIEW!

Disclaimer: I don't own Supernatural or its characters.

Sweet Surrender

~Chapter Six~

"John, what do we do?" Mary asks, "What do we do?"

"We split them up." John replies, "I think it's a phase."

"John…" Mary warns, "I…I was upstairs last night and I heard quiet talking coming from Sam's room…"

John looks to Mary and pulls her to sit with him on their bed, holding her hand tightly in his own as she tries not to cry.

"I looked through the crack in the door and they were kissing…" Mary explains, "But…oh God, John…they were laying there with the sheets covering their lower bodies but they were naked from the waist up at least…"

Mary breaks into tears and takes a deep breath.

"And Dean was…touching her chest…" Mary continues, "And she was looking right into his eyes, and as they kissed, she was making soft, dare I say, pleasure-filled noises…telling Dean she loved him and she couldn't wait until…until she was eighteen so they could…"

"So they could what?" John asks, "So they could what, Mary?"

"So they could make love." Mary finishes, "John…I don't think this is a phase…"

John and Mary sit downstairs that night, watching a movie while Dean and Sam are in bed. They hope and pray they're not in the same bed.

But Dean and Sam are in the same bed. They're in Dean's bed tonight, and as strange as this seems, they're practicing for when they can make love. They're in a side by side position, Sam's right leg resting on top of Dean's (both clad in sweatpants) as Dean rocks his hips against hers. Their top halves are bare, and Dean's right hand cradles Sam's head, his left stroking her breasts. They break their kissing and stare right into each other's eyes.

"I love you," Sam whispers, her breath hitching as Dean's erection brushed against her, stimulating her and making that wetness emerge between her legs again to which she lets out his name in a shaky sigh, "Dean…"

"I love you too, Sammy." Dean whispers, thrusting against her slowly and kissing her again.

Dean leans down and kisses her neck, shoulders and then taking her nipple in his mouth. Sam kisses and licks Dean's pulse point in response, both of them moaning softly.

By this time, the movie has ended, and as John and Mary headed upstairs, from Dean's room in the attic were soft noises, both female and male voices. Mary looks to John in horror and they both sneak through the door to the attic steps. Creeping up them, the couple are aghast when through the railing they see what Dean and Sam are doing. They see their children look right into one another's eyes and share tender kisses, gazes and caresses, mainly around Sam's top half. They want to look away but just can't.

"Dean," They hear Sam whisper, "Dean, you won't leave me will you…? Even if our parents abandon us…?"

Dean kisses Sam tenderly and looks into her eyes, thrusting his hips again.

"I'll never, ever leave you, Sammy…" Dean promises, "I love you so much."

Sam gasps and smiles through tears as she looks up at Dean. She caresses his cheek and pulls him in for a chaste kiss.

"I love you too, more than anything." She whispers, suddenly taking in a sharp breath and shivering as her face flushes, "Oh, Dean…Oh…I'm…"

Dean bites her neck gently and groans into the flesh as he comes in his boxers, Sam lets out many sharp breaths and soft moans as she comes in her underwear. They slow their movements and relax, sharing kisses and touches before Dean moves over and settles above Sam, caressing her face tenderly before kissing her lips and climbing off her again. He takes her into his arms and covers them up, Sam snuggling against his well muscled chest.

John and Mary creep back down the stairs, both in tears after what they've just seen.

Sam doesn't leave Dean's room that night. She lies in his arms all night, savouring every moment they ever have together, savouring every breath Dean takes in case it's the last one she gets to share with him. As he sleeps, she looks up at his beautiful face and sighs.

"I love you." She whispers, "I'll always love you."

Sam beams as she sees Dean smile in his sleep at her words.

The next morning at the breakfast table, Sam and Dean are met with nervous glances from Mary who is stood at the sink.

"What is it, Mom?" Sam asks, sighing when she guesses what it could be about, "I know you're unhappy about us…and we're sorry…but you can't ch-…"

Her sentence is interrupted by Mary's tearful confession.

"We saw you last night."

Dean drops his toast and Sam gasps, instinctively reaching for Dean.

"Mom…I…we…" Sam begins.

"Why were you in that position?" Mary asks, both Sam and Dean shocked by the question.

"Oh…we…we're preparing for…well…when I'm eighteen…" Sam tells her mother, "I'm not gonna lie to you, Mom."

"You're practicing positions?" Mary asks, "You're actually considering sleeping together?"

Dean holds Sam's hand tightly and strokes it reassuringly.

"We're set on it, Mary." He tells her, "We love one another and nothing you and my dad do is gonna change that."

"Your father's angry, Dean." Mary says quietly.

"I don't care." Dean replies, "I don't care how he feels about this. We love each other and that's all."

Mary returns to washing the dishes and Sam turns her head, resting it on Dean's shoulder. She breaks into silent tears against him and Dean wraps his arms around her.

"Come on, Sammy." He whispers, "Come on, give your Mom some space."

He leads Sam upstairs and they sit on her bed, Dean taking her into his arms.

"I don't wanna go to school today." She cries, "I don't."

"You have to, Sammy." Dean tells her, kissing her lips gently, "You have to."

"I don't want to!" She protests, "Dean, I don't want to go!"

"Why not?" Dean asks, wincing when Sam looks up at him with tearful eyes.

"I can't…not when I know all this is happening here," She replies, "I can't leave you alone here."

"You can't stay at home because I'm here." Dean says softly, "I'm going to work in a couple of hours anyway…you need to go to school, Sammy."

"I just wanna leave home…and run away with you." Sam whispers, "I feel like our parents hate us! They look upon us with disgust, Dean, and don't pretend you don't see it."

Dean sighs and holds her close, trying to keep her sob wracked body still as Sam hiccups and cries heavily into his shoulder. He kisses her lips and she trembles in his arms, lips quivering against his as they move together slowly.

"Just calm down," Dean says softly, "Take deep breaths and dry those gorgeous brown eyes of yours."

The comment makes Sam smile sweetly through her tears.

"Wash your face, get dressed and I'll drop you off at school." He tells her, "Don't tell anyone, okay? We'll keep it between us, baby…just you and me."

Sam nods against him and then sighs.

"And Mom and John." She adds, Dean nodding in response.

He looks up to see Mary watching through the door and he fights to suppress a growl. She and his father have no right to interfere.

"I love you, Sammy."

"I love you, Dean."

Mary begins to realise that John's plan to split them up is probably going to backfire.

-TBC-