jungkook takes time to discover his hyung's kinks as a way to connect with them now that he's become part of their polyamorous relationship.
or
the one where jungkook fucks his hyungs throughout the week.
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Jungkook knew for sure something had changed after that faithful dinner. Where the tension broke loose and their relationship developed into something else. Something more.
But not that much. With the size of his hyungs, Jungkook was already used to being of service as much as he could. He was used to helping Seokjin into his car. Bringing up the beer sixpacks up the stairs for Namjoon. Be on the look out to tug Yoongi's shirt back down from his overhangs, so he doesn't get sunburnt. Go looking for skincare products with Hoseok for his newly blooming stretchmarks. Kneeling in front of Jimin before he hesitates to ask for Jungkook to tie his shoes. And offer and arm for Taehyung to lean his weight into when they're walking together, keeping track of his own pace to not hurry the older.
So he was used to helping them, but never like this. He didn't know helping could feel this good.
It was a slow process, it wasn't like just after that night Jungkook fell straight into the role of his hyungs' fuck thing.
One night, at Seokjin's place, he caught sight of his hyung rubbing his lower back with a pained expression while getting the dishes off the coffee table (even when Jungkook insisted, Seokjin worked hard to still try and spoil the dongseang in any way he could). He could hear the grunting as he watched Seokjin's chubby hand struggle to reach at the spot where the pain must be coming from: right in the center of his fattened lower back.
He bites his lip, quietly getting up, sneaking behind Seokjin. Not saying a word as his hand reaches easily, thumb sinking into the bulging fat of his muffin top to rub against it. Seokjin's reaction is immediate, knees buckling (as if they weren't shaky enough from standing), and gripping the edge of the kitchen countertop as he sighed in relief.
"Jungkook..." It sounds like the beginning of a complaint. So the younger doesn't let him finish, chin carefully hooking onto the pliant chub of his shoulder; nuzzling whatever is left of his neck.
"I got it." Jungkook reassures with a whisper. His other hand cupping Seokjin's fattened waist, keeping him in place gingerly as his tattooed hand works the strain on his back. His own muscular legs staying in place as Seokjin leaned more and more of his weight on Jungkook the more he relaxed.
That's how it started at least. His crotch inevitably sinking into the roundness of Seokjin's ass. Hand getting a proper feel of his hyung's body for the first time since that night. Still careful about how much was too much. He couldn't help it when the tent in his pants began to show, and embarrassingly press to Seokjin's inviting body.
But even then, with the slow and painful build of his hard on, the urging of his hips to hump against the welcoming softness. Jungkook keeps it slow. Not wanting to make Seokjin even ore sore than he already is. Guiding him to his room with curious but gentle hands. Seokjin's lips showing that same hesitance in the soft meeting of their lips. Jungkook taking advantage of his strength to help lower his hyung onto the bed.
