If you're okay with it: somnophilia, underage!sam, guilty!dean, and maybe john doesn't sleep that tight after all. Sam and Dean have to share a bed once again while John sleeps on the couch, and Dean hates it, having his little oblivious innocent brother so close but not being allowed to touch him. It's torture, so eventually Dean gives in, just a few touches won't hurt Sammy, right? But then Dean loses himself...
I am so sorry this took so long to post! I thought that I had put it in my queue but I had saved it to my drafts! I hope this is the sort of thing you were looking for but thank you so much for your prompt! Sorry it was so angsty =( Let me know what you think!
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Dean groans as he walks into the motel room and sees only one queen bed again.
“Dad, do we really have to keep doing this? I mean Sam isn’t exactly small anymore and he is like a furnace to sleep next to at night!” Dean whines eyeing the considerably small bed with distaste.
John merely quirks at eyebrow at his eldest, it is rare for Dean to complain, especially about something so trivial.
“We need to save the money Dean”, John replies somewhat sympathetically, “just a week or so longer and we will be back on track.”
Dean grunts by way of response, throwing his duffle bag on the ground and storming into the bathroom to get changed.
“It’s alright dad it’s just the heat making him bitchy” Sam smiles at his dad as he jumps on the bed and gets ready for bed.
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Dean turns the hot water on full blast and steps into the shower carefully.
It had been a couple of months since Dean had started to notice the changes in Sam. At first he didn’t think much of it, he had spent his whole life watching Sam. It’s all he has ever known. However, when he started to notice Sam growing taller, his broadening shoulders, his muscles developing and his trim waist Dean began to think he was watching a little too closely. It was when Dean started to notice the way Sam’s skin glistened when he was sweating or the way his stomach muscles flexed when he laughed or the way his dimpled smile and sunflower eyes made Dean’s heart skip a beat that he realised he has a problem.
Dean groans as he tilts his head against the cool tiles and savours the sting of the hot water washing over his body.
“What am I going to do?” He whispers to himself trying to think of a way to avoid having to sleep in the same bed as his brother.
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 “Hey dad, why don’t you take the bed with Sammy tonight?” Dean says casually as he walks out of the bathroom, passing Sam on the way.
“Nah it’s ok Dean I have to do some research so I will sleep on the couch so I don’t keep you boys up.”
Dean grumbles as he slides into the bed, the sheets itchy against his skin, as he shuffles around trying to get comfortable.
When Sam walks out of the bathroom, stripping off his t-shirt on the way and hopping into bed next to him in nothing but a low slung pair of boxers, Dean can’t hide the look of horror on his face.
“What’s wrong De?” Sam asks innocently looking up at Dean through his overgrown bangs.
“Nothing Sammy….just try and stay on your side of the bed tonight alright sasquatch?” Dean murmurs before dragging himself closer to the edge of the bed and turning his back to Sam.
He lies perfectly still, almost trying not to breathe, scared that at any moment his body will betray him and he will reach over and touch Sam.
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A couple of hours later when John finally turns off the lights and falls asleep, Dean is still awake.
As usual Sam has already crowded onto Dean’s side of the bed and is pressed up against Dean’s back, the steady flow of moist breath warming the back of his neck. Sam shifts a little in his sleep, lifting his arm to rest on Dean’s hip, unconsciously pulling him backwards and grinding his hips lightly against Dean.
Dean knows he should just get up and go sleep in the car. He should be a responsible older brother and put a stop to this, after all Sam is still asleep and vulnerable, but he can’t will himself to move. The warmth of Sam pushed flush against his back is too enticing and Dean can’t help but moan softly as he thrusts back against Sam’s half hard cock. Sam mewls quietly at the extra pressure pushing on his crotch as his cock begins to harden and take interest. Dean huffs, leaning back to run his hand over Sam’s back, he is sure he means to push Sam away but as soon as his hand makes contact with Sam’s bare skin he forgets why this is whole thing was a bad idea and turns around to face Sam.
Sam’s face is completely relaxed. His mouth is slightly parted, lips red, shiny and slicked with spit as he puffs out little breaths of air. Dean rests his hand on Sam’s hip and traces soft circles with the pad of his thumb. The skin on Sam’s stomach is smooth, warm and inviting under his touch and Dean can’t help but want more. He edges closer until he can clearly see the small mole on Sam’s right cheek before lightly brushing their lips together. Sam doesn’t wake but opens his lips lightly giving Dean a small taste of his tongue.
He slips his hand lower under Sam’s boxers and strokes lightly. He takes his time learning Sam’s cock, memorising the feel and remembering how each brush, graze and touch evokes a different moan or gasp from Sam. It’s only when Dean brushes his thumb over the head of Sam’s cock, spreading the small amount of precome that has gathered there that Sam stirs into wakefulness.
“Dean?” His voice is rough with sleep and sounds almost like a growl.
Dean doesn’t know what to say. He has fuck up and worse still he has fucked Sammy up too. He goes to withdraw his hand and whisper some sort of apology before Sam’s hand stops him. Sam gazes into Dean’s eyes before his lips quirk into a shy smile.
“Please…..don’t stop.”
Dean knows that he shouldn’t . He shouldn’t let his desires corrupt Sam and change things between them but when Sam says his name again in a low whisper he can’t help but give in.
Sam wriggles his boxers down a little lower and shifts closer to Dean pressing a small trail of kisses down Dean’s shoulder. Dean nods slightly before pulling softly on Sam’s cock, his thumb running up the underside, and stroking slowly before building up speed. Sam moans low in his throat and gasps at the sensation.
They hear the faint noise of rustling sheets coming from the couch and Dean’s breath catches inhis throat.
“Sammy you’ve gotta stay quiet” Dean begs remembering their dad is mere metres away sleeping on the couch.
Sam nods before burying his head in Dean’s shoulder in order to muffle his whimpers. He digs his nails into Dean’s arm as Dean picks up pace. Before long everything becomes hazy as waves of pleasure roll over Sam’s skin.
“Fuck Dean….” He groans loudly as he cums into Dean’s hand and against his stomach.
They both lay together silently in the afterglow, breathing heavily, as they listen to John shuffle on the couch trying to get comfortable.
 “Hey Dean…” Sam whispers softly trying to reach out for his brother and draw him closer.
“Just go to sleep Sammy we can talk tomorrow” Dean responds gruffly, the twist of guilt already heavy in his stomach, as he rolls over and feigns sleep.
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Dean brushes Sam’s fringe out of his face as he nudges him awake.
“Sam…Sammy….you gotta wake up”, Dean whispers desperately, “We have to clean this mess up….Dad can’t know.”
Sam smiles sleepily at Dean before leaning up and brushing their lips together. Dean clears his throat softly and turns away to hide the faint blush rising on his cheeks. They work together silently ripping the sheets off of the bed before bundling them in the corner. Dean lets out a breath of relief when they are finally done and their dad still hasn’t woken up. They can just blame the dirty sheets on Sam spilling cereal on them and maybe just maybe they can get away without their dad suspecting anything.
“I’m gonna jump in the shower before dad wakes up” Dean murmurs giving Sam’s arm a quick reassuring squeeze  to indicate that everything is okay between them.
When Dean walks out of the bathroom 10 minutes later and John has a firm scowl fixed on his face and won’t look Dean in the eye, Dean knows that he heard them. After that they keep their touching to a minimum and Dean doesn’t say much to either of them the whole day.
After another 10 hours of driving, with John keeping a close eye on them through the rear view mirror, Â they finally pull into the motel parking lot and John looks at Dean for the first time.
“I’m gonna grab a room” He grunts out as he slams the door of the impala.
Dean knows his dad will never say anything but he can see the disgust clearly evident in his eyes. He had been watching them both like a hawk, flinching every time they innocently touched and growling whenever Sam leant closer to Dean. As they walk to their motel room, Sam trailing behind, and Dean opens the door to find two queen beds his stomach clenches uncomfortably.
“I’ll share with Sammy tonight” John growls as he throws his duffle on the bed closest to the door.
“It’s okay dad I…” But John’s cool stare cuts the words right out of Sam’s mouth and he just stares at his feet awkwardly.
“I think I’m gonna go for a walk” Dean murmurs as he throws his bag down and heads for the door, Sam close at his heel.
“No, Sam stay here. You two need some time apart.”
Dean only makes it a couple of steps out the door before he is throwing up bile in a motel trash bin.
He fucked up. He fucked Sam up. And now his dad knows. Â
