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Dean has to be doing it on purpose, Sam thinks. His brother is certainly arrogant enough to know just how good he looks walking around dressed like that. Sam’s just grateful that dad is going to be gone for a few more days, because it’s only been a couple of hours since Dean got dressed, and Sam’s more than ready to jump his bones.
The house they’re staying in is big, much bigger than the shitty places they usually find. Yeah, it’s run down, but it’s warm, has decent water pressure and comfy beds. Even though they’ve rid the house of the poltergeist, the owner is still too scared to come back, despite being mid-renovation. He said they could stay if they wanted to, so that’s what they’re doing. Dean seems to have taken it a little far in that he’s helping himself to some of the guy’s clothes, but Sam can’t exactly complain when this is the result.
The younger teen is attempting to do homework when Dean oh so casually - and cockily - strolls out of the kitchen. Even though he’s barefoot and barely making a sound, Sam is so attuned to his brother’s presence, and so on edge that he can hear him like Dean is wearing his heavy boots. Sam licks his lips and tries not to look up, but he knows that the view that will greet him is too good to resist, and since this thing started between them, Dean damn well knows his baby brother can’t get enough.
“Mornin’ Sammy,” Dean says, from the doorway, “isn’t there something else you’d rather be doing than schoolwork, right now?” The tone is faux innocent, just enough of a tease in it to rile Sam up even further, but not so overt that he can be called out on it.
The teen lets out a sigh, “Like what?” he almost snaps back, immediately irritated at himself for taking the bait, as well as at Dean for being the annoying shit he is. The bratty baby brother in him rages at Dean, while the horny teen is relieved that this torture is going to be coming to an end.
The older Winchester abandons the pretence, then, letting that sexier than it has any right to be smirk spread across his face. He licks his lips, then bites on his bottom one in a way he knows drives Sam to distraction, “Oh, I don’t know,” he replies, smoothing a hand over his own broadening chest and stomach, “I was thinking maybe,” the hand moves down towards his crotch - the same one Sam’s been unable to take his eyes off all morning because it’s impossible not to when the outline of Dean’s cock is so visible under those red sweats - and gently cups his balls, “... you could do me, instead.”
Sam swallows, trying to moisten his suddenly dry mouth. The clicking of his tongue is loud to his own ears, and he swallows again, wanting to let out some kind of bitchy retort, but it dies in his throat as the red fabric clearly shows Dean’s cock slowly hardening. His own, which has been half hard all morning now stands at full attention, and he can only look into his brother’s lust dark eyes and nod.
Soon he’s on his knees in front of Dean, long fingers shaking as he reaches up to undo the string and slide the red fabric down slowly, revealing his brother’s thick cock, slick and shiny at the head just for Sam. He moans at the sight of it, wasting no time wrapping his hand around the base and taking that hot, smooth and musky flesh into his now watering mouth. Nothing else can compare to the unique taste and feel of his brother, and he's obsessed. With Dean’s encouraging hand cupping the back of his head, and words of praise driving him on, Sam sinks down further until he can barely breathe.
He’s going to let Dean fuck his willing mouth until his gorgeous big brother is making those delicious breathy moans and is desperate for release, probably coming when Dean does without a hand on his own dick because Dean falling apart is the sexiest thing he’s ever seen, heard or felt in his short life.
It won’t be long after that he’s inevitably working his own fingers into his ass, spreading his legs wide to give Dean a show before his brother dives in, licking and sucking on Sam’s cock and balls before pushing his thicker finger inside, both of them spreading Sam’s eager hole wide enough for Dean’s hard again cock to fit inside. Whether it’s right here on the dining table, or they make it to a bedroom, his brother will fuck him face to face, slow and easy at first, trapping Sam’s dick between their stomachs but not giving him enough friction to get off, before he rolls them over, Dean flat on his back and Sam happily bouncing on his brother’s thick cock until his legs won’t hold him up any more. That’s when Dean likes to sit up and fuck up into him as deep as he can go, fist wrapped around Sam’s smaller dick, expertly drawing another orgasm from him, fucking him through it and shooting his load into his baby brother’s still spasming ass.
Sam will still be pissed off that Dean once again used his own sexiness as a weapon, but honestly, he can’t find it in himself to be sorry about falling for it once again.