Sam licked the sweat from Dean’s sternum as he slid a second finger in, savoring the long, low moan that racked his entire body.
“I thought you were joking when you said you’ve never done it,” Sam whispered against his skin, shooting him a sly grin before he moved his attention to Dean’s neck. He sucked at the skin on the column of his throat, left a red mark that’d deepen into a bruise in the morning.
“Shut up, Sammy. Have you seen how freakishly big your hands are? Can you blame me for thinking you’d tear me in half?”
His hips were propped up on the two pillows from their spare bed and his stomach folded, rolled in a way that drove Sam mad. He wanted to move down and lick at that sweat-dewed skin, bite at it, touch the small, soft pouch of his lower stomach with a reverence Dean would never feel he deserved.
Sam rocked his two overly-lubed two fingers into Dean, careful to keep them from slipping out entirely. Dean must have been fucked before, though his body was resistant in spite of how much he liked what Sam was doing to him. He let one leg fall wide open, leaving him exposed and vulnerable in a way that Sam knew he must have hated. Not so much that he was going to stop it, though.
Dean grabbed roughly onto Sam’s arms as he spread his fingers inside him, preparing for a third.
“God, how can you take it when I stick it in you?” He hissed, breathing hard as Sam tried to comfort him.
“You’ve been doing me since we were kids,” Sam hummed, lining up his ring finger, “I’m used to it.”
Dean scoffed in disbelief, going on some tangent on how it seemed impossible anyone could get used to anything going into an out hole when Sam slowly eased his third finger in. Maybe ease wasn’t the right word, but it went as smoothly as he could hope with Dean’s impressively tight anus.
“Fuck!” Dean cried out, his head bracing against the bed and his back arching as Sam pushed in slowly, gently as he could manage without being forced right back out. “Something’s gotta give, right? I’m gonna burst or your fingers are gonna break, right?”
Sam laughed softly, leaning in close to Dean and kissing him reassuringly on the mouth. Dean grabbed the back of Sam’s head and held him in place, getting out all of his worries onto his baby brother’s lips.
“It’s just my hand tonight. You’ll survive that.”
Dean nodded hurriedly, trying to urge him to get the next finger over with, knowing how much the thumb would be. Sam pressed past the tight ring of muscle, sliding in and making Dean shudder. He felt unstoppable like this, being in control of Dean for once. Sam kissed his jaw, felt him smile even as he groaned at the fullness that came with his four long fingers. They formed a peak inside him, held together to get him used to the feeling of it before he spread them all out, liking how Dean gasped and grabbed at him desperately.
“You’re gonna break me, Sammy,” he said into his hair, breathing low and rough.
“Calm down, you’re okay.” He reached down between his legs, gave some much desired attention to his hard, untouched cock. It was a challenge, seeing if Dean could hold out until Sam got the entirety of his hand into him. Precome gathered at the slit, smeared onto Dean’s stomach, and he decided that he didn’t want him blowing his load so soon.
Sam sat back as he folded his thumb against his palm, inching it in slowly until it breached the muscle. Dean took in a long, shaking breath, looking surprised as it slotted in along with the knuckle, and Sam’s whole hand was swallowed.
He grinned, moving in to awkwardly, yet triumphantly, kiss Dean on the mouth. Sam fit perfectly.