This is a longer form draft so I'm gonna give warnings just in case
Warnings for Incest OBVIOUSLY, chubby Dean appreciation, Super light breeding kink like its only really in Sam's passing thoughts- and honestly everything else don't matter- READ AT YOUR OWN RISK!!! (Base on @winchiya1 's amazing art which is at the bottom of the fic, GO SUPPORT AND FOLLOW THEM THEY LET ME USE THEIR IDEA!!)
Dean's definitely put on a bit of weight over the years, nothing bad but he's gotten softer in spots, and Sam has DEFINITELY noticed it... the small roundness of his tummy and the chubbiness in his thighs, Sam finds it hard to keep his hands off Dean, he doesn't think deans noticed- and if he has he certainly hasn't mentioned it, maybe he's embarrassed, thinks it makes him less attractive to not have a six pack but Sam doesn't this so, it was only a matter of time before Sam started grabbing deans thighs at diners or wrapping his arms around Dean from behind just to get a feel at his stomach, Dean always bats his hands away but it reaches a point where Sam can't keep ignoring it.
Sam comes up with his plan of attack, he tells Dean to grab him something, and while deans bent over in the fridge, Sam gets behind him and runs his hands over deans tummy. Dean mutters a gruff. "What are you doing-" Before a gasp is knocked out of him by the force of Sam's bulge grinding against his ass. Sam doesn't relent. He grinds up again, and this time, he unbuckles deans belt, pulling his pants open and sliding his hands up Deans shirt. "You're so hot, dean- fuck you dont even know do you? All soft and sweet for me" Sam growls into deans ear, it doesn't take long for them to find themselves in their bed, Dean stripped, and Sam with three fingers buried in his big brothers hole
Dean, letting out small sobs. Squirms and thrashes a bit in bed, he grinds down on them and the rocking of his hips hypnotises Sam with the way the soft chub bounces with him, it only takes a few more whines for Sam to be forcing his too big cock into dean, the older of the pair cries out under Sam as he starts a rough pace that shocks dean to his core. Gasping and sobbing, he grips at the sheets while Sam thrusts with deadly accuracy into his prostate, making Dean see stars.
Sam mumbles praises, even saying Dean looks girlish with his new chubbiness, which makes Dean whine high in his throat, and it really tips him over the edge when Sam mutters in his ear that Dean looked like the perfect fit for a mother, Dean cums over his stomach and chest only serving to push Sam over the edge with him. Sam wastes no time leaning down to lick deans cum off his soft pudge, Sam thinks he hears dean say something about it being gross but he's too far gone to care at this point.
After the adrenaline cools and they are left cuddling eachother in bed it doesn't take long for Dean to slip into a light slumber, Sam takes that time to watch his big brothers relaxed face.
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