Wow, you really want to fuck a skeleton.

Headcanon: Dean teaching his brother how to ride his cock in the back seat of the impala every time John left them both alone ✨choke me, big brother✨

And Dean hasn't noticed, but Sam has.

Dad has been watching them almost warily recently. His eyes are glued to them at all times, brows furrowed when he sees them sitting close enough for their thighs to touch.

And Sam knows maybe he should go tell Dean. Tell him it might be time to stop, except he's 16. He's pissed at dad for the crappy hand they got dealt in life, and all his rebellion in the world just seems to get him crappy punishments and lecturers.

And this? This was quite literally the biggest fuck you Sam could give to him.

It's so stupid, and he knows if Dean knew he would be freaking the hell out, but he hasn't noticed and Sam's getting quite a kick out of the idea. Of showing dad that he's getting fucked by his big brother, and it's all his fault really, because he loves Dean far too much than he ought to, because of the fucked up way John dragged them up.

He links their fingers under diner tables, and Dean doesn't question it. Just grips his hand right back and continues his lunch with one hand, talking away while oblivious to the stare dad is directing at their arms as they disappear beneath the table.

They've always had some issues with personal space, but Sam really tries to up his game. He's practically sitting on Dean's lap on Bobby's couch, and when he leans across Dean's thighs to reach his book on the floor, dad straight up leaves the room. Sam smirks, and Dean is too focused on whatever is playing on the TV to notice the events that just transpired.

He keeps it up for weeks. He stumbles into Dean a few too many times to be natural, and his brother grips his waist to steady him. He wipes food from his face, and asks to try some of his pie even if he really has no interest in the stuff, because dads face is a fucking picture when Dean lifts a spoon to his mouth, and he really makes sure to groan and lick up the cream. It even has Dean squirming in his seat, and Sam's fairly certain dad picked up on that too.

It all comes to a head soon enough, and honestly? This time, Sam wasn't planning it.

He was riding Dean's lap like his life depended on it, his big brother burying his face in his neck while Sam grips at his shoulders. He doesn't hear the impala pull up, but he sees the door open.

He sees John staring through the crack, and his expression is one of pure shock, far more grim than Sam had seen him wear on any hunt.

And Sam just grabs on tighter, staring John in the eye as he moans Dean's name and slams back down onto his brothers cock.

"God, Sammy. So fucking amazing baby."

The door shuts silently, and when John returns a few hours later reaking of whiskey, Dean is asleep, all the evidence is gone, and Sam is pretending to be asleep.

Sam licks his lips, eyeing Dean from beneath dark lashes.

Sam’s pretty much passed out, and Dean’s using his soft, compliant body to get off. He’s got Sam pinned beneath him as he moves inside him, Sam’s legs wrapped limply around his waist.

Fuck, he looks beautiful - soft pink lips slightly parted, hair fanned out on the pillow. “God, Sammy,” Dean grunts. “You need to get wasted more often.” He leans down to kiss him, tasting the whiskey on his breath. “Such a good boy.”

Sam makes a small sound, eyes fluttering. He can feel it, but he’s too out of it to respond much. They’d agreed to this earlier, and - - fuck, it feels good. Even if he can’t do much in the way of showing appreciation for it. “U-Uh,” he gasps out, his hips jerking a little bit.

Dean’s cock is wet, and Sam’s body’s gripping him like a vice. “Gonna make such a mess inside you, sweetheart,” he whispers, trailing his lips down Sam’s neck. “Gonna be so full of come. Hope that’s okay, baby.” He kisses him again, and doubles up his effort. He needs to come inside Sam’s hole now.

Sam whimpers, his cock jerking - and eventually spilling. He has no control over his body right now, and the way Dean’s pounding into his prostate? He can’t hold it anymore. His body convulses, cock spurting all over his shirt and belly. His eyes flutter, and he unintentionally bears down on Dean’s dick.

“Oh, fuck,” Dean hisses, and he’s coming, too - spilling hot and messy into Sam’s hole, thrusting until he’s oversensitive and tingling. “Good boy, good boy…”

He pulls out, watching the come leak from Sam’s ass. He goes down, and kisses the inside of Sam’s thigh, tasting himself. “Can’t wait for you to wake up,” he mutters, nuzzling his skin.