It's their third week together when Bucky finally asks again. Tony had come back into town the night before and they agreed to have a night of reunion sex but Bucky had other ideas. He suggested that Tony teach him how to pleasure Steve the best possible way that Tony knows how. Steve agreed, commenting that it had been a while since they'd done it, and so they're here now, naked and ready.
As they're here now Steve enjoys every warm kiss that brushes against his legs and knees, moaning softly every time Tony's and Bucky's lips connect with his skin. He groans, throwing an arm over his face when Tony pushes his knees apart.
Bucky settles down between them and breathes out slowly. He feels a reassuring hand on his shoulder and lips at the back of his neck.
"You're sure about this?" Tony murmurs, lips catching James' earlobe between his teeth.
"Yeah, I just-" He pauses to look down at Steve's smooth ass, pink and pert and ready, "Fuck."
With a low chuckle Tony reaches for the lube on the nightstand, popping the lid.
"You've been to war and you're worried about shoving your fist up someone's ass?"
"Tony!" Steve scolds., receiving a smirk from his husband
"Hold this," Tony murmurs, shoving the lube into Bucky's hand before reaching for the small brown bottle on the nightstand. He unscrews the lid, inhaling the amyl nitrite deeply. He shakes his head with a groan, offering the bottle to James.
"Here, it'll help you relax. Just inhale, there you go. Feel good yet?"
Bucky simply laughs and Tony closes the bottle, slapping Bucky's hip lightly.
"Slick 'em up."
With a deep breath Bucky squirts a generous amount of J-Lube onto his fingers and Tony takes the bottle.
"Ready?" Tony asks, receiving a soft hum from Steve in compliance.
"Start with two," the older man says softly, reaching out to guide Bucky's fingers into the right angle and sliding them in. It feels weird for him at first, Steve's ass tight and slick and warm around his fingers. It's definitely not the same thing as fingering a woman.
"He can take more but I always start with two," Tony explains.
"No you don't," Steve objects.
"Shut up or you won't get anything. I'll take Bucky and leave you here to fuck yourself, which we both know you're capable of doing. You're such a slut for that."
"Fuck," Bucky mutters, wiggling his fingers slightly.
Tony leans over to suck at Steve's nipples teasingly before pulling back.
"Are you good?" Bucky asks hesitantly, looking up at Steve, "Can I-?"
"I'm good, yes."
With a short nod Bucky slips a third finger past the thick ring of Steve's ass, earning a faint squishing sound and it's almost too much. Fucking is one thing but this. This is so new and intimate and the fact that Tony is teaching him makes it even worse.
"You're sure you're okay to do this?" Tony asks, "You don't have to. I'll finish."
"No, no, I- it's fine."
"Here, take this."
Tony reaches for the small brown bottle, opening it and offering it to Bucky who takes another deep breath. It takes the edge off even more so than the first time and it's a little easier to look at the way Steve's ass strains against his fingers.
Tony grabs the bottle of J-Lube, slicking his own fingers up and slipping 2 alongside Bucky's 3.
"Oh," Steve moans, his fingers wrapping in the sheets.
"Holy shit," Bucky gasps, "How?"
"Practice," Tony says with a wink.
Tony thrusts his fingers in with shallow motions and bats Bucky's hand away long enough to make sure Steve is loose enough to take his fist. Tony pulls back and grabs Bucky's wrist gently, positioning it and pushing it in slowly.
"Jesus," Bucky whispers, glancing back at Tony and then down at his flaccid cock, "Fuck, how are you not hard?"
Tony laughs again, the same smirk from earlier still playing at his lips.
"I'm used to it," he whispers lowly, flicking his tongue out to lick along the shell of Bucky's ear, "We'll spend hours in bed. Hours just working his ass. He's like woman; he can come over and over until he literally blacks out."
"You'll have to show me sometime."
Tony reaches down to grip his wrist, urging it deeper into Steve and Steve finally gives a whine when Bucky's knuckles brush that tiny bundle of pleasure deep inside.
"There," Steve gasps in desperation, shifting in attempt to bring the pleasure back, "Tony, please-"
"Calm down, peaches, I know where it is," Tony murmurs. Bucky snickers in amusement as he withdraws his fist and Tony's replaces it just that fast.
"I'm gonna build him up and you can finish him," Tony explains, reaching for the lube and squirting a generous amount of it onto his skin. He slicks it halfway to the forearm, sliding into Steve's gaping hole easily with a sickening squish. Bucky moves to the side and lowers his mouth onto the tip of Steve's cock, sucking briefly and flicking his tongue across the slit as clear pre-come smears across his tongue. He moans softly and he can hear Tony's fist punching into Steve relentlessly. He pulls out with a slick pop and Steve groans, rolling onto his belly and rising to his knees and elbows.
Tony grabs Bucky's forearm, pulling him over and Bucky slides his hand into Steve's slick heat, fingers curling into a tight ball as he nudges gently further and further. He angles down as Tony tells him to, thrusting his hand in tiny, quick movements as Steve's hand wraps around his own hard cock.
Bucky feels Tony's chin resting in the crook of his shoulder and he's littering teasing, soft kisses to the skin as he presses against him. Tony slides a hand around his taught belly, reaching down to grasp James' cock in a grasp that's becoming more familiar with each night spent in the tower.
Tony smirks, his lips still placing kisses against Bucky's neck and shoulder. This was about Steve at first but Steve can take care of himself and it's so easy for Tony to play Bucky. He sucks at his earlobe briefly as his hand moves in quick jerks and strokes Bucky's cock.
"Look at you," Tony whispers hotly, "This was about Steve at first but you're just so fucking hard. Not that I can blame you, look at this, your fist buried so deep inside of him and he loves it. Look at that faces and tell me Steve doesn't love this."
Bucky turns his head to catch Tony's mouth in a heated kiss and he moans, pushing his fist further into Steve as Tony's tongue ravages his own, their noses bent and conformed to each other's cheeks. Steve comes first, the only sign of him having done so is the way his body writhes and slides against the sheets. Tony's pace picks up on James' cock, his expert calloused fingers pulling and tugging gently.
Tony pulls back, pressing a wet, open-mouthed kiss to Bucky's cheek, his hand still working quickly at his cock and Bucky's hand still buried in Steve.
"Come for me," Tony whispers, pressing kisses to his face between each question, "Come for me like you always do. Can you be a good boy for me? Be a good boy, Bucky, come on. Look at Steve, he's so good. You can be good just like him, can't you?"
With a groan Bucky spills onto Tony's hand, falling forward and bracing himself on Steve's back with his free hand.
"Fuck," he finally breathes, pulling his hand out of Steve with a sickening slurping sound. Steve falls forward onto his belly, completely spent, and Tony swipes his semen-covered hand on the sheets. He grabs Bucky by the arm, pulling him down between himself and Steve. He settles on Tony's shoulder, spent and exhausted, and idly wipes his hand on the duvet.
The three remain silent for a long while and James is the first to say anything. He raises a hand, stroking his fingers along Steve's back.
"You asleep?" he whispers, receiving no response. He shifts so that he's facing Tony who sprawls onto his back in a welcoming position. He hesitates before bringing his fingers up to touch the soft blue glow of Tony's arc reactor.
"Really something, hm?" Tony mutters, his eyes closed, "Still not used to it. You'd think I would be. This big hunk of metal just sitting there, keeping me alive."
James' entire palm moves to rest over the hard, incandescent surface. He doesn't tell Tony so, but he thinks it's the most beautiful think he's ever seen.