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[untitled beach sex fic]

Summary:

Tony stupidly offers Steve a pair of Medium-sized swim trunks to borrow for a day down on his private beach. The results are catastrophic.

Notes:

For the Steve Rogers Bingo square, "Medium Steve" (because of the shorts! this is all because of the "medium"-sized shorts! c'mon, it counts...), and also a belated gift for whinysteve, who rose to my comment bingo challenge with flying colors (as in: blacked out a whole dang card 🤗)!

(See the end of the work for more notes.)

Work Text:

 

tony stark on the beach, covertly watching steve walk down to the water in his blue booty shorts

 

 

His first mistake had been inviting Steve to go for a swim down on his private beach. It had been such a hot afternoon, though, and it was Steve’s first time in California and the guy still hadn’t swam in the Pacific Ocean yet, so it seemed like the logical thing to do…

His second mistake wasn’t offering to loan Steve a pair of swim trunks when he’d realized that he’d forgotten to pack any; no, that in itself wasn’t anything other than showing basic hospitality. His second mistake had been catching sight of those little blue trunks and wondering what Steve would look like in those, then saying to him, “I’ve got these, but they’re a size Medium… not sure they’re gonna fit…”

Only for Steve—being the ever-obliging, good sport that he is—to reply, “No problem; they stretch, don’t they?”

(Yeah, they stretched, alright. God, did they stretch.)

Of course, Tony only realized what a terrible mistake he’d made when Steve stepped out of the guest bathroom, wearing nothing but those criminally tight-fitting blue trunks—so tight and small on him that they looked like a speedo designed for perverts—ineffectively trying to tug the edges into some semblance of modesty and looking a little sheepish in that ridiculously charming way.

“I, uh, might have something else in here,” Tony thickly managed, gesturing toward the chest of drawers that was mostly full of mis-matched bikini parts left behind by nameless guests over the years. 

“Don’t worry about it,” Steve had smiled. “This is fine.”

 

It was definitely not fine.

 

Tony had brought a book with him down to the water, pretending as if he was content to lie on his towel and read for a bit while Steve went in for a swim. The truth was that he needed to put some space between himself and the gorgeous near-naked supersoldier, whose perfect physique was distracting enough without noticing the substantial package he was clearly sporting beneath that barely-there swimsuit. But Tony had definitely noticed, and the thought of seeing Steve dripping wet in that little getup was leading his imagination into some pretty dangerous territory, hence his need to hide behind the book he’d hastily swiped from his shelf. 

Had Steve seemed disappointed that Tony didn’t want to swim with him? He couldn’t be quite sure. He couldn’t be sure of anything just then, since the sight of Steve’s backside in those teeny tiny trunks as he walked down to the water was taking up way too much space in Tony’s brain while he watched the younger man go, getting unaccountably aroused just from looking at him. 

There were pale, attractive tan lines (left by much better-fitting shorts) on Steve’s flawless skin that the trunks did nothing to conceal, and Tony found himself almost as fixated on those as he was by the sight of that completely bodacious ass moving beneath the taut blue material as Steve made his way across the sand. Fuck, he was gorgeous. Beyond gorgeous. As much as Tony’s horny mind wanted to imagine Steve as some hot, young hunk debuting in the porno of his dreams— in which the beautiful blonde ingénue can’t wait to get down and dirty with the attractive sugar daddy on his private beach— Steve was so good-looking that he transcended the kinds of lecherous fantasies that Tony’s dirty mind kept trying to reduce him to. As he waded out into the water, diving below for a moment before popping back up and slicking back his blonde hair, Steve just seemed completely unreal; more gorgeous than any man had any right to be; something too good to be true.

It was no wonder that Tony wanted him so bad. It wasn’t much different than that impulse he’d get whenever he saw a truly magnificently-built car that was equal parts stunning beauty and formidable horsepower: he wanted to ride it— hard and fast— make it show him what it was made of.

He was sure that if Rogers had been into that sort of thing, he’d have gotten him purring underneath him in no time, too. But Rogers wasn’t a shiny new sports car, and he almost certainly wasn’t down for any homosexual shenanigans on Tony’s beach. 

Which was such a fucking pity. 

Tony consoled himself by reaching for the tanning oil, giving himself a thorough rub-down now that Steve was off on a long swim down the coastline, moving so powerfully through the mostly-placid water that he was already getting too far away to ogle anymore. 

It should’ve meant that Tony’s libido could chill out for awhile, but Tony didn’t work like that. Not when he had all that hot, fresh Steve Rogers mental material to work with.

The fantasy had started innocently enough; Steve would ask Tony to rub some of his tanning oil onto him as Tony happily obliged, straddling the younger man’s thighs as he worked his hands up and down that beautifully-sculpted back, his touch igniting sensations in Steve that would soon have him moaning into his towel and telling Tony how good his hands felt, begging him for more. 

As Tony’s greased-up hand rubbed slowly over his own chest, eyes closed as he imagined how hot it would be to hear Steve begging for his touch, he let out a groan as he thumbed at his own nipple, feeling his cock tenting his trunks as his fantasy escalated further.

Steve would be so desperate for it as Tony worked his hands down over the backs of Steve’s thick, muscular thighs; so desperate that—when Tony finally slid a hand underneath the edge of those tight little trunks and stroked hard and firm against that perky little ass, Steve would moan so tellingly that Tony would know without a doubt that he could tug those trunks down right then and there, and Steve would be grateful for it.

Without meaning to, Tony had somehow gotten himself so hard that he was actually leaking into his heavily-tented swim trunks as he cursed and scanned the horizon, trying to figure out how far away Steve had gone. 

He couldn’t even see the guy anymore. For all he knew, Steve could’ve swam around the pier and gotten halfway to the point by now…

Which meant that Tony would be alone for awhile…

He had to do something about the weapons-grade boner in his trunks before Steve came back, since that thing didn’t seem like it would be deflating on its own anytime soon. 

Before he could overthink it— getting off even more on the surprisingly illicit thrill of jerking off in a semi-public space while Steve was out there somewhere— Tony slid an oil-slicked hand beneath his waistband and groaned at the satisfaction of all that warm, tight pressure surrounding his needy hard-on. 

He let his mind drift back to the previous scenario, imagining how good it would feel to just slip right into that beautiful bare ass while Steve whined out his name, desperate for Tony to pound him into the sand; to punish his ass for teasing him with that skimpy little outfit. 

God, that would be amazing – fucking Captain America right in his tight, perfect little ass, right there on the beach, while he moaned like the prettiest slut Tony had ever had, eagerly giving it up for Tony to use however he pleased…

As he got himself more and more worked up by the crude fantasy, Tony rolled over onto his stomach and tried humping into the sand through his oversized towel as he stifled a moan against it, delirious from the hotness of his fantasy. When the towel beneath him didn’t provide the kind of resistance he was desperate for, he hastily shoved at the sand through the towel, gathering up a big mound of it and packing it together tightly with the towel, until he’d formed a shape that could roughly serve as a model of Steve’s butt for him to rut against through his trunks as he gave in to the dictates of his lust-addled mind and body.

Shit— that was so good!!

Tony didn’t even care that he was moments away from coming in his trunks, since he could simply sprint down to the water afterwards for a post-masturbatory soak, letting the sea wash away any evidence of what he’d been up to while Steve was off putting olympic swimmers to shame. He was too far-gone now to care about impropriety, or about the potentially awkward aftermath of letting himself jerk off to an explicit sexual fantasy involving his much younger team captain. There was no room in his brain for worrying about that sort of thing. Not when there was a mound of sand beneath his towel that felt close enough to a supersoldier’s ass to drive his dick wild as he ground down into it, pretending that he could have something that he could never actually have, no matter how much he wanted it…

He was so out of his mind with arousal that he almost thought that the sound that he heard was his own blood rushing in his ears as it got louder and louder, until another sound beneath it barely managed to catch his attention—

—it was the sound of heavy breathing, and that steady rhythm wasn’t his own blood; it was the muted but distinct sound of heavy footfalls jogging across the sand. 

Tony went still, swallowing thickly and turning his head away as he awkwardly tried to position his body into something that looked more or less natural enough to pass as a “lounging” posture (rather than an “oops I was actually just humping the sand while pretending it was your butt” posture). 

Steve sounded somewhat winded as he slowed down in his jog, calling out, “Whew! Made it all the way to the pier!” 

Still turned away from Steve, Tony’s wide eyes darted about as he tried to think of what he could possibly do in this situation to play it cool without letting Steve figure out what had been going on.

“It was pretty busy out there,” Steve mentioned, sounding closer now as he rifled through his backpack for the water bottle he’d brought, gulping down what sounded like half of it before gasping out, “...dunno if anyone recognized me… I decided to jog back along the shoreline – probably ran too fast for anyone to get a good look anyway.”

“‘S good,” Tony murmured, his voice coming out a bit rough.

“...What’s going on? You okay?” Steve asked, because of course he knew something was up.

“Mmhmm,” Tony lied, turning his head around to try to reassure Steve with what must’ve been an unconvincing expression. 

Steve frowned at him, saying, “...You sure? Why does your face look all… red, and puffy?”

Goddamn it. 

“Leg cramp,” Tony offered, “...just trying to stretch it out. Low potassium, probably.”

“Oh,” Steve blinked. “Did you go in the water?”

“...Not yet,” Tony demurred, pushing himself up a little on his forearms and muttering. “My body doesn’t need a reason to cramp up on me. We can’t all be as young and spry as you, okay?”

“...Okay…” Steve allowed, still giving Tony an odd look, but apparently accepting the explanation easily enough, thank god.

After laying out his own towel right next to Tony’s— way too close by, in Tony’s nerve-wracked opinion— Steve stretched out next to him, exhaling with satisfaction.

“Gorgeous out, huh?”

Tony hummed a small affirmative in reply, begging his erection to calm the fuck down already. The fear of being interrupted had taken a little of the edge off, but his angry cock wasn’t gonna give up that easily. 

“Something smells good… what is that?” Steve asked, sniffing the air as he scanned around for the source of the scent. 

A flare of panic rose up as Tony immediately assumed that Steve’s supersenses could actually detect pheromones or something, and were somehow on to Tony’s pathetic situation, but then Steve murmured, “Smells like jasmine, I think? And coconut…” —and suddenly Tony could breathe again.

“Tanning oil,” Tony rasped out, indicating the bottle sticking out of his bag with a flick of his head.

“Oh yeah?” Steve replied, reaching over to the bag to pull the bottle out for his inspection. “Mind if I try some?”

This was karma, or something. Tony had displeased the gods by desecrating his teammate like that in his perverse mind, and this was his punishment. 

“Knock yourself out.”

He wouldn’t watch. He refused to watch. He definitely would not look over at all while Steve Rogers proceeded to rub himself down with Tony’s favorite tanning oil, making himself smell just like him, all those muscles shimmering in the hot afternoon sun; its bright rays reflecting off the microparticles of mica dust that gave the deliciously aromatic formula that little extra oomph of sexiness. 

That’s what Tony had firmly told himself before something traitorous in his body overrode his command and had him staring at the younger man beside him just as he busied himself with rubbing a handful of oil into those astonishingly voluptuous tits. 

Tony was never gonna make it off that beach alive. 

He’d brought a cold pack along that had some bottles of hard lemonade inside. Reaching for his bag, resolutely ignoring the drag of the semi in his trunks as it shifted against the sand, Tony grabbed one of the bottles like it was a lifeline and sucked half of it down while he kept his eyes averted from the gratuitous soft porn happening right there on the towel beside him. 

Though he was pretty sure that he hadn’t gotten drunk off of a single bottle of hard lemonade, Tony wasn’t quite sure he’d heard correctly when Steve apparently rolled onto his stomach and asked, “Could you do my back for me?”

And yet, there he was, assuming the exact posture that Tony had fantasized about a short time ago, looking at Tony expectantly as he held out the amber bottle, waiting for an answer.

With a somewhat manic glint in his eyes, Tony chugged down the rest of the lemonade and tossed the bottle into the sand, deciding that if the gods were this determined to fuck with him today, he was gonna fuck right back.

Keeping his semi out of the way as he mounted Steve’s thighs was a bit of an issue, but Tony had a decent buzz going on after all, so he didn’t stress too hard over it. The bigger issue was the pleased little rumble of sound that Steve made when Tony’s hands began to work the oil into his skin, turning it into a proper massage without even intending to as Steve groaned appreciatively beneath him. 

“Oh wow… that feels nice,” Steve murmured as Tony’s mind drifted off, rubbing down the supersoldier with all the skill that Tony had picked up from years and years of being on the receiving end of some truly out-of-this-world massages by highly-paid pros, learning their techniques through osmosis and trying them out on so many appreciative partners over the years. It had been awhile since Tony had given anyone a massage; a long while since that someone had been another man… But it all came back to him easily with Steve sprawled out beneath him like that, moaning with satisfaction as Tony traced along the firm planes of his back and shoulders, exploring all that incredible musculature with his confident, curious hands. 

“You’re like a work of art,” Tony mused, saying it aloud, unfiltered, as soon as the thought occurred to him. It was too late to take it back, now.

Steve tilted his head a little before murmuring, “...You think so?”

Too embarrassed to say more about it, Tony just stroked a long, slow, firm line up either side of Steve’s spine with his thumbs, making Steve sigh out a long, low moan of satisfaction from the deep, steady pressure. 

Resolving to try to keep his own mouth shut, Tony let his hands do the talking, conveying just how incredible Steve’s body was as his hands mapped out his impeccable muscle groups, releasing tension and soothing over any residual soreness with gentle fingertips before delving into the next tempting area. 

Steve’s skin was remarkably soft considering all the power it contained beneath it; soft and flawless, glowing with a certain radiance that seemed more to do with who Steve was than some mere perk of his youth.

Even so— Steve still was very young, no matter what year he’d actually been born in. That was more apparent than ever up close like this, while Tony straddled his gorgeous, young body like the dirty old man that he most certainly was. He’d thought that he'd finally matured enough to want more age-appropriate relationships, now that he wasn’t in his 30s anymore. He’d actually let himself go gray at the temples, telling his colorist that he was ready to embrace the whole salt-and-pepper chic thing, now… But as Steve Rogers completely melted under his groping hands, moaning even more sweetly for him than he had in Tony’s sex fantasy, Tony already knew that he’d be making a move on the poor kid before he could think better of it.

“...You carry a lot of tension, Cap…”

Steve let out a little snort at that observation, murmuring, “No kidding.”

“You might wanna let someone do this for you more often,” Tony mentioned. “It could make a world of difference…”

“...You offering?” Steve asked after a short pause of consideration.

“I’m not a pro,” Tony smirked. 

“Coulda fooled me,” Steve groaned out, grunting a little as Tony worked at a persistent knot beneath his scapula. 

“I could refer somebody to you,” Tony offered, breaking up the knot as Steve relaxed beneath his ministrations. 

“Guessing you’re not available, then,” Steve breathed with apparent disappointment — and Tony had been around long enough to detect the flirty little tone beneath that statement. He smirked down at the younger man, rewarding him with a stimulating sweep of his fingers fanning over Steve’s skin that left him shivering appreciatively. 

“...Didn’t say that,” Tony flirted back. 

It didn’t take much doing at all, then, to shift the touches into the kind meant to tease, as Tony realized that the totally gorgeous man between his legs happened to land considerably higher on the Kinsey scale than he’d always assumed. ...Well, whaddya know?

Steve was definitely into this.

That still didn’t mean that Tony should exploit him like this, using the irresistible powers of seduction that had been bestowed upon him for evil. Because even if Steve was getting turned on by Tony’s sensual massage abilities, he was still Steve fucking Rogers, after all… 

…Which… actually just made the whole deal that much hotter……

Resigning himself to whatever hell awaited him, Tony let his thumbs delve beneath the already too-low waistband of Steve’s “medium”-sized swim trunks, pressing into that sweet spot on either side of Steve’s glutes that drew out the most sexualized sound from Steve’s astonished mouth, yet.

Bingo.

Mmmm… Tony… your hands….” Steve moaned as Tony massaged the fuck out of Steve’s immaculate butt muscles, his words uncannily echoing Tony’s earlier fantasy.

“...Yeah? You like that?” Tony purred, using his own voice to great effect. 

As Steve made the most gratifying sounds beneath him, Tony continued to massage the younger man’s ass by slipping his hands inside the stretched-out scrap of swimwear, working him over so effectively that when Tony let his fingers curl around the sides of Steve’s hips, still massaging the tops of Steve’s grateful glutes with his thumbs as he let the rest of his fingers probe new territory, Steve automatically lifted his hips to give Tony better access, encouraging him to slide his hands down further until his fingertips were touching the wiry hairs around Steve’s heated groin. Tony experimentally stroked over these a little, letting his fingertips tug on the sensitive hairs with their recoiling drag as Steve gasped out a high little sound that was music to Tony’s ears.

Deliberately letting his own, fully raging erection nudge against the inside of Steve’s thighs, Tony continued to play with Steve’s hip bones as he gave the younger man a chance to object. Steve had gone still after gasping in a sharp breath, but made no move to throw Tony off of him. 

“Want me to keep going?” Tony murmured, elated when he saw Steve eagerly nod his head in confirmation. 

“Breathe, Steve,” Tony whispered, reveling in the younger man’s shaky breath when he let his left hand delve even lower, finding the frankly massive hard-on that he knew was waiting for him and running the full length of his hand over it appreciatively.

Steve’s breaths were coming in short and staggered, but at least the kid was breathing. After getting a good enough handful of him to know what he was working with, Tony pulled his hand free to Steve’s audible objection, rubbing his back reassuringly as he reached for another splash of oil.

“I’m never gonna be able to use this stuff again without getting hard,” Tony mused aloud, making Steve stifle a funny sound in his towel as he waited anxiously for Tony’s hand to find its way down his trunks again, this time with a handful of sweet-smelling slickness to ease the way. 

Playing with Steve’s cock while Tony straddled the surprisingly vocal supersoldier from behind was way more fun than it had any right to be. Playing with his hole, next, was even better.

If anyone had told Tony that inviting Steve down to his private beach would lead to fingering him through his swim trunks while he wailed lewdly into his beach towel, Tony would’ve taken Steve there a lot sooner. Because this was insanely hot – possibly the single hottest thing he’d ever done with anyone else, which was quite an inflammatory statement, all things considered. Nevertheless, as Tony peeled the trunks aside even further to watch as he worked a second finger into Steve’s slutty little opening, he knew that this one was extremely high up there, to say the least.

Getting those trunks off once and for all was super fun. Steve’s tan lines were gonna be the death of him, seeing all that pale, pretty skin surrounding his perfect ass contrasted with the deep golden tone of his thighs and back; and then, flipping Steve onto his back and finally getting an eyeful of that mouth-watering, pink-flushed cock –- the visual alone was enough to have him leaking over his own fist like some dog slobbering over a fresh cut of meat. 

Then Steve was wrapping his legs around Tony’s waist and begging to get fucked, and it was a miracle that he didn’t lose it right there. 

Steve lost it pretty quick, however; after working his way inside, Tony had barely begun to thrust into him before Steve was coming in thick spurts all over his own abs and pecs, making Tony choke off a harsh curse as he continued to pound into him, bouncing Steve’s astonishingly resilient cock again and again as it continued to spurt all over the place, convincing Tony once and for all that this was actually happening and wasn’t some hallucination brought on by heat stroke after all, since even his own imagination—filthy as it was—had never come up with anything nearly as incredible as the sight and sounds and even the delicious fucking smell of all that. 

Salty seawater and sharp, musky sweat; indolic jasmine absolute and tropical coconut mixed with a fuckton of hot cum. It was a sensory overload that had Tony riding the most incredible sexual high as he pulled out just in time to come all over Steve’s overheated body, nailing him right on the mouth as he loomed over the panting kid, painting his neck and tits in a satisfying burst of his own milky release.

Tony rolled over on the sand, shielding his eyes from the glare of the sun as he started to come back to his senses. He was a total mess, but he knew that Steve was far worse. Rolling his head to the side, he allowed a long, indulgent glance to rake over the mess they’d both made of Steve’s gorgeous skin, wondering at how he wore it so damn well.

“Now that’s a work of art,” Tony felt the need to say.

“Ugh,” Steve grumbled, pulling a face as he glanced down at himself. “Think I’m gonna go for another swim.”

“Sounds like a good plan,” Tony agreed.

“...Care to join me this time, or are you just gonna watch again while you pretend to read that book?” Steve snarked, favoring Tony with a knowing smirk that looked way too good on his stupidly handsome face.

Tony blinked at Steve for a beat before telling him, “Y’know what, Rogers…”

“...What?” Steve challenged, as Tony pushed himself awkwardly into a sitting position, grunting and stretching out his sore muscles.

Reaching for a handful of sand, Tony rose up onto his knees and smeared the handful into the sticky mess on Steve’s chest and abs, telling him, “That’s what” as he straddled the younger man and shoved him back onto the towel to kiss him stupid. 

“Mmmm…” Steve happily hummed as Tony broke away, looking down at him with an expression that said, what are you gonna do about it?

“Is that so?” Steve replied, one eyebrow lifting in a way that Tony should’ve recognized for the warning that it was.

Before he knew what was happening, though, Steve was already hauling him up in a quick fireman’s carry that literally knocked the air out of Tony’s diaphragm as he took off at a sprint towards the shoreline, laughing as he deposited Tony’s naked, flailing body into the water with a splash. 

Tony didn’t mind a bit of juvenile roughhousing with Steve, though. He’d gladly lose the splashy wrestling match that ensued; especially when the loser got kissed like that, afterwards.

Maybe he wouldn’t mind dating a younger guy so much, after all.

 

Notes:

fic and manip originally posted to tumblr, here: (x)

*that's my new sideblog, btw, where I've been posting all my original content, if you want to follow along <3

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