Big

Steve's little, Bucky's big. Easy as that. As much as Steve hated being scrawny, he loved how Bucky could manhandle him. He loved how easy Buck could hold him down. He loved how Buck could bend him over his knee and how hard he could swing down on him. He loved how Bucky could pin his hips to the bed and have his way with him. The problem was, really, that Bucky wasn't only big as in 'strong'. He was big in every which way you could spin it.

They fooled around plenty, that's for sure, but Steve knows. He knows how it works between a man and a woman, and he knows how to replicate it. Buck worries every step of the way though, and has the habit of tiring Steve out before he can start insisting. Steve, however, is stubborn. Stubborn and horny and adamant about proving his frail little body won't stop him forever.

He tried a finger first. A mess of Vaseline and spit later, he figured out how to make that feel alright. Next time, he got himself worked up all the way to two, which didn't feel great but by the time he came he could scissor them inside him easily. That was a good enough sign for him to get going.

"Hey Buck," Steve starts one night. Bucky is lounged back across the living room couch, eyes closed as he listens to the radio. "I wanna try something."

"Hm?" Bucky hums, a noncommittal response. Steve knows he's teasing him, but he also hates being ignored, so before he says anything else he climbs up onto Bucky's lap and straddles him. Buck's eyes don't open, but his eyebrows do go up.

"I want to try something," Steve repeats, mouth sticking. There's a bit of anxiety and trepidation sitting in his gut that he has to chew through to get his words out.

"What you got in mind, kid?" He asks. Now or never, Steve thinks.

"I want you to take me," Steve says. He tries his best to sound confident but it comes out higher then he thought it would.

"Hm," Bucky hums to himself, like he's considering it. "Aren't we s'posed to get hitched first?

"Quit fooling around!" Steve says. A smirk cracks across Bucky's face. "Come on, Buck."

"Don't get all worked up now," Bucky sighs, finally opening his eyes. The way he gazes up at him snatches Steve's breath away every time. "You want to try?"

Steve nods, swallowing down his nerves. His face grows hot as Bucky studies him, like it always does when they talk about this sort of thing.

"You want me to take you all the way?" Bucky purrs. The words hit Steve like a brick wall, all smooth-talking charisma. "Have you been thinking about it, sugar?"

"Yeah," Steve admits. Buck's hands land on his thighs, a comfort and a wild distraction. "I've been thinking about it lots."

"I've been thinking about it since my dick started working, probably," Bucky grins. "I just don't know if you can take it."

"I can take anything you give me, Barnes," Steve shoots back. Buck raises a solitary brow, like a challenge, and something ugly rears up in the back of Steve's mind. He's speaking before he can think. "You're too soft on me. I ain't a dame-"

Bucky sits straight up, knocking Steve backwards and sending his arms pin wheeling. The next moment, he's being yanked forward again, then to the side, knocked face down into the couch over Bucky's knee.

"Watch it!" Steve shouts, mostly out of surprise. A second later, Bucky's hand comes down on his backside.

"I know damn well you ain't a dame, Rogers," Bucky says. He isn't mad, really, but he knows Steve too well and he knows when to put a boy in his place. He swings down again and Steve yelps, holding tight onto the cushions. "If ya were, I'd have married you already and we wouldn't need to have this conversation."

"Buck!" Steve exclaims. Another spank, and then another right after that. "Sorry!"

The next hit doesn't come. Instead, Bucky hums and rubs over the cleft of his ass. A moment later, he's sliding his hand past the loose hem of his bottoms to get a real hold of him.

"You ever had anything in here before?" Bucky asks, squeezing for emphasis. Steve nods, tucking his face into his arm. "Yeah? What?"

"Fingers, Buck," Steve admits.

"Yours? Those scrawny things?" Bucky teases. Steve opens his mouth to snap back, but Bucky is too quick. "Don't make me hit you again."

"Yes Bucky," Steve mumbles.

"Why don't you show me," He says, "then we'll see."

----

Steve ends up on his back in their bed, fumbling with slick hands trying to close the jar of petroleum jelly. Bucky takes the jar from him and tightens the lid, leaning over Steve to place it on the bedside table. Steve takes advantage of the moments under Bucky to reach between his legs and start to spread the lube over his entrance. His hands are only shaking a little bit.

Bucky leans back on his knees slowly, gaze dragging down to where Steve is very slowly rubbing himself. Something lights up behind his eyes when Steve dips a finger in to the first knuckle, fighting the urge to tense with those eyes boring into him.

"Jesus Buck," Steve mumbles, nervous. "Way to make a fella feel comfortable."

To his credit, Bucky does get a little sheepish. Apologetic, he reaches out to rub Steve's thigh, kissing the inside of his ankle and calf. Steve let's his eyes slip closed. This is Bucky. Just Bucky, his Bucky. He can relax. Deep breaths.

It's vulnerable and it's awkward, but it works. He slides his middle finger in like he practiced and hurries himself along. By the time he gets a second one all the way in, Bucky is wrapping his hand around Steve's dick and making him twitch.

"Pretty," Bucky murmurs. Steve desperately wants to speed this up, but he can't get his fingers deeper like this, can barely get the leverage to spread them, and he's tiring quickly of the angle. Working harder just ends with a twinge of pain and Bucky shushing him. "Take your time."

"Can't," Steve insists. Bucky's fingers slip where his are instead. "Oh, are you-"

Bucky pushes in a finger alongside Steve's two. It burns just a bit at the stretch, but he's slow and careful and it's so, so different coming from someone else that Steve's mouth drops open in a breathy moan. When it's all the way in, he slides it in between Steve's two, spreading him wider than before. He rocks his finger in and out, slowly, deep, curling it to pull forward and backwards and open him up from the inside. After a moment, Steve's own fingers slip out and Bucky guides his hand to hold his own leg up, knee to chest. He slides another finger in to replace the two and works him open, slow and steady. Focused, running up and down his walls, until he brushes across a spot that makes pleasure shoot into his stomach.

"Oh!" Steve gasps. His eyes fly open in time to see Bucky smiling, right before he rubs circles against that spot, insistent, and they slam shut again. "Bucky!"

"Hush, love" Bucky chuckles. His fingers stay steady, not moving faster or harder, just the same even circles that make Steve squirm. Bucky moves the hand still wrapped around Steve's dick, slowly jerking him off, and Steve actually whimpers.

"Buck, I-" He cuts himself off with a groan, hips rocking back onto Bucky's hand. His fingers are white knuckling the sheets, leveraging himself to push harder onto that spot. "I could cum like this. Bucky, it's so much, I might cum. Can I? Let me, please, it's so good. Feels so good, love your fingers, please? Can I cum?"

He's babbling, he knows, but it's difficult not to. Bucky's smiling all smug and proud, cock when he says, "I thought you wanted me to fuck you?"

Steve whines out loud. Bucky's hand is speeding up around his dick and his gut is growing tighter, hotter.

"It's alright, doll. Cum for me," Bucky coos. 

Steve obeys because it's the only thing he can do. He cums hard enough to steal his breath away, thighs squeezing around Bucky's wrist and quivering as it rakes through him. Bucky keeps jerking him off even after he slides his fingers out, slow and painstakingly thorough. Steve twitches, squirms, begs all over again until Buck finally lets up.

Later, when Steve is a bit less embarrassed and fucked out of his mind, he'll slide to his knees in front of Bucky and thank him properly. For now, he slides the pillow over his head and pretends he can't hear Bucky call him dramatic.