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Tony wakes up with a headache and an uncomfortable sweat sticking to his shirt and hair. He blinks a few times to push away the fuzziness of sleep and slowly comes to the realization that he's been kidnapped. Again.
Hooray.
It's pitch black and he's locked in a ridiculously small space, made of metal and roughly cube shaped. Also, there's another body about twice his size and weight pushing against his front and taking up most of his personal space. There's hair tickling Tony's neck and a solid waist pressed between Tony's calves due to his knees nearly touching his own chin.
Tony wiggles his arm out from where it's folded at his side to try to find the man's pulse. He's wearing body armor- god damn those shoulders- and his pulse is strong and steady. Reaching a little further past his neck, Tony's hand presses against a giant disk on the man's back.
"Cap. Cap, wake up."
Steve jolts awake and Tony groans when he's incidentally bashed in the side with a knee. Cap grabs the sides of his chest before he seems to actually wake up.
"Tony? What's going on?"
"Someone managed to nab us and threw us in this box. Just woke up, so I don't know anything else yet."
At least now the reactor is uncovered, Steve leaning as far back as he can from Tony, the small amount of light letting Tony relax and take a better stock of the situation.
"Think you can break us out of here, muscle man?"
"Maybe. Move back a bit."
"There's nowhere for me to go, Rogers."
Steve grumbles briefly before pressing his arms against the walls and straining. Sitting so close, Tony can see his arms ripple underneath the suit. That would be more distracting if the metal were breaking. But, sadly, there's not so much as a squeak from their titanium prison. Or vibranium. Fuck, he hopes it's not vibranium.
"Stop, stop it, you're just gonna hurt yourself."
"Well. Do you have any other plans?"
Tony thinks for a second, moving his arms to test the wiggle room they have and reaching down to pat his pockets.
"Maybe we can get your shield off your back? Maybe then you can brute force the ceiling or a seam or something."
"That might work. Here, let me-"
"Okay let me just scoot this way-"
"You're sitting on my hand, move over here a bit-"
"Ow hey- careful with the merch, dammit, this skin's expensive-"
"Tony-"
"Okay, stop it, this isn't working."
Steve grunts but obeys. Steve's arms are too large to successfully fold between them, let alone fold back and grab the edge of the shield, then pull it off without accidentally braining Tony. Tony wiggles a little and pulls his hands in front of him.
"Let me get it off and try to get it behind me, then you can slam it upward and pop us out like a soda can."
Steve sighs and tries to curl into himself. He grunts and squirms as Tony starts to rearrange himself. He works himself further against Steve's front, slotting himself in place from hips to chest, and tries to wiggle his hand between muscle and metal.
"Damn it, hang on-"
Steve's breath hitches when Tony starts to shift himself around again, trying to move his body further down or to the side so he can work his arm under the shield.
"Tony-"
"Give me a sec, I can't get my arm up."
"Tony, hold on-"
"Almost got it, just gotta move down a bit more-"
"Tony-"
"Let me just squeeze in here and reach back-"
Tony freezes when he pulls himself closer to Steve by squeezing his legs around the Captain's waist.
Oh shit.
That is. A very large dick nestled right against his ass. Damn that is right there, huh. Oh fuck, shit, that's kinda his fault, isn't it. Oops.
"Oh."
Steve makes a quiet sound and starts shaking. Tony hates himself a little bit when he's distracted by Steve's abs rippling against his stomach and feels his own muscles flex in response. Steve's dick twitches against his ass.
"It's- it's fine. No shame, it's a perfectly natural reaction."
"Stop talking."
"Yep, okay, gonna shut up now."
The silence is not better. All he can hear is his own heart pounding and Steve's deep breathing, trying to calm himself down. After a few minutes, with what feels like little success, Tony starts to reach back for the shield again. Steve makes a sound like he's been punched.
"Sorry, sorry- I'm just trying to unclip the shield!"
"You need to stop moving at all."
"That's hard for me to do, Cap. I don't do well with containment, you know I don't stay still long. I can try to move away but there's not really anywhere for me to go."
Steve whines, honest to God whines, and large hands appear low on Tony's back. He swallows hard and mentally curses when he feels his own body start to respond to the position.
He gets an idea. Then he groans at the idea, because it's the worst fucking idea.
"You need help with that?"
Of course, no one ever said he has a filter, even when he really fucking hates himself for not having a filter, and for the way Steve goes still as marble against his front. He's so damn stupid.
"You-... Tony, you can't be serious-"
That doesn't... Sound like a no.
"I mean- it gets it out of the way, right? Then we can focus on escaping."
"This is hardly any place for- for... i-intercourse."
"Intercourse, fucks sake- There's not really a way to avoid it until it goes away and it's just going to get more awkward the longer we wait."
"I can ignore it."
"Your dick is practically fighting your jeans."
Steve chokes and grips the base of Tony's shirt. They're both quiet for a long minute that feels like torture. He's pretty sure Steve will say no anyway, and he'd be fine with that. Of course he would, it would just make everything really difficult until they can bust out.
On the other hand, it wouldn't exactly be a burden to take Cap up the ass. Sure he's never done it before, but it can't be that bad. And the thought of being pinned against Steve's chest, completely at his mercy... Tony's definitely a willing participant.
"I-I don't know if that's a good idea. I could hurt you."
"Could also feel really great, you know."
"Yeah, it's just... I'm... Uh... P-Proportional..."
Tony swallows at that thought. He can feel it rubbing against him. Fuck, his mouth is watering.
"Don't see a problem there, Cap."
He jumps a bit when Steve huffs out a breath against his neck and- and one of his hands scoots lower down his spine. Tony barely manages to suppress a shudder.
"Okay."
"Okay?"
"Yeah. Yeah, okay. It- it's starting to hurt."
"Okay. Here, just a- hold on-"
Tony wiggles his hands between them, digging one hand into his pocket to pull out a travel tube of lotion and twists his arm back to fit it into Steve's palm. He feels Steve wrap his hand around it carefully, fingers trailing over the sides to figure out what it is.
"Lotion. Makes it an easier ride."
Steve audibly swallows again and nods against Tony's shoulder. He pats Steve on the arm in an attempt at comforting before realizing his hands are shaking. Tony quickly moves them down between them again and sets to work on getting their pants off. He unbuckles his belt and pops open his fly, then strains his legs as he lifts his hips enough to shimmy his jeans down to about halfway down his thighs. He shivers when Steve's hands come back down to rest on his bare ass.
Fuck, why is he so nervous? He's acting like he's a damn teen again.
"You can uh- start prep if you want. Unless you want me to do it."
"No- no, no. I got this."
"Just be careful, yeah?"
"Of course."
Tony nods and clenches his hands a couple times to stop the shaking. He gulps when the pop of the lotion bottle opening echos in his ear. Slowly, keeping his hands pressed against Steve to advertise his movements, he draws his hands down to Steve's pants and flicks open his uniform. He falters when he hears the bottle be placed on the ground and feels one of Steve's hands grip and pull on his ass. He has to bite his tongue to suppress a pathetic sound when he feels a slick finger press against his hole.
"Is this okay?"
"Yeah, it's fine. Just- just keep going."
Then there's pressure and Tony tries to relax as Steve's finger worms its way into him. Fuck he's got big hands. Steve inches his finger into Tony bit by bit, flexing and bending until Tony feels the rest of Steve's knuckles press against his ass. Cap stops and lets Tony get his head back on right.
Quickly, he pushes his hand into Steve's uniform and fishes around for a second before pulling out the biggest dick he has ever seen on a human being. Holy shit, he can't even wrap his hand around it. Tony tries to lean back a bit to get a look as he gives it an experimental tug. Steve does a full body twitch and his dick pulses in Tony's hand. God damn, the head is above his belly button, this thing is not going to fit in him.
But no one's ever called Tony a quitter before.
"Gonna need a few more fingers for this, Cap."
Steve shudders and pants in his ear, but takes the hint. When Tony presses down on the finger that he's slowly getting used to, Steve hooks it and starts to move it in and out. Then a second suddenly presses past the ring of muscle and joins the pointer. Tony bites his lip and flexes around Steve's fingers as he begins to pump and spread them. It's a strange feeling, not bad, but not super good either.
Tony really starts to feel the stretch when Steve wiggles a third in. He sucks in a breath and Steve stops to let him adjust.
"Too much?"
"No, I can take it. Just um... Been a while. Go ahead."
Steve hesitates for a split second before continuing. Neither talk as the heavy fingers work his insides open. Steve does stop once to apply a bit more lotion to his fingers, leaving Tony strangely cold. Then Steve presses four into him, and Tony gasps. Steve presses his hand far in, Tony can feel when the knuckles push their way past his hole, and only stops when his thumb is pressed along Tony's skin.
"Hnm fuck..."
Steve stays dead still for a few moments, until Tony relaxes a bit more, then starts to move his fingertips in a petting motion. This time, Tony can't hold in his moan.
"You're so soft inside..."
"Ahhah- fuck, Steve-"
"Sorry- Sorry, just- I'm a lot, and I don't want to tear anything. Do you think-"
Steve takes a shuddering breath and Tony can feel his hand flex inside of him.
"Do you think you can take all of them?"
Steve's voice is shaky, but Tony's never heard him sound so turned on before and fuck does it do things to his libido. If this was any other situation, if Steve was any smaller, he probably would have said no.
Tony nods.
"Shit... Okay, deep breath. This'll be a lot of pressure."
Tony's laugh gives way to a moan as Steve presses the thumb in as well. Fuck he's never felt so stretched before. He keeps wiggling his fingers, massaging the deepest parts of Tony, and stretches his arm around to work his thumb in inch by inch. Fuck it's so much, he can feel his body trying to reject the intrusion, especially when the widest part of Steve's hand presses up against his tailbone-
Then suddenly he's closing up over Steve's wrist, squeezing around the folded hand inside of him. Steve's dick pulses against his stomach as both of them moan loudly.
"Oh god, Tony, you did it. You did it, you did it, that's so... Fuck, you're amazing."
Tony can't do anything but moan as Steve begins to twist his hand inside of him, stretching his walls farther than Tony thought safe or possible. His brain is so close to turning offline with the sensation, every nerve alight with the hand flexing and- holy fucking shit- spreading inside of him.
He does keep enough of his mind to know that this is as far as they need to go with prep. So he reaches back behind him and fumbles until he finds the lotion bottle. And because he can't help himself, he plops the bottle in his lap and reaches back to feel where Steve is connected with him. His fingers trace down to Steve's wrist and follows the circle of his stretched hole. He bites his tongue before pressing one finger against Steve's wrist and trying to press in next to him. Steve moans loud in his ear and his arm flexes against Tony's finger. He is soft inside, and he reaches far enough in to curve his finger between Steve's thumb and palm. He feels Steve's thumb curl over his own finger and squeeze gently before letting go. Tony quickly pulls his hand back around front and pops the lotion open again.
While Steve slowly begins to pull his hand out, Tony squirts a large amount of lotion onto his hand and pours a dollop onto the head of Steve's dick before dropping the bottle aside again. He rubs the liquid between his hands for a second before firmly wrapping both hands around the girth. Steve falters and clenches his hand, and Tony moans as the motion leaves a fist inside of him. He works his hands quickly, using one to lather as much of the shaft as he can and the other to spread the lotion over the head. Fuck, he hopes one day Steve will let Tony suck him off.
Steve pulls his hand back to leave just the tips in his hole before he suddenly spreads, making Tony jump and gasp as cold air hits his insides. Steve groans and fully removes his hand, shifting to grasp Tony's hips instead. Tony takes a second to collect himself.
"Ready, big man?"
Steve groans and lifts Tony up as far as he can, which, really, isn't far until Tony's head hits the top of the box. Still, he can work with that.
Gently, Tony moves Steve's dick down under him and gulps when he feels it immediately settle in the seam of his ass. He can feel the head leak against his lower back. He's starting to wonder if this is a bad idea.
Before he can talk himself out of it, Tony gently angles his hips and reaches back to hold under the head. After a little more awkward maneuvering, Tony feels the blunt pressure against his hole and takes a deep breath before pressing against the head. There's more pressure, he forces himself to relax, and-
"Oo-ohh fuck!"
The huge head pops right in, pressing against his already abused walls. God he's big- but then Steve snaps his hips instinctively and he falls out again.
"No, wait, Cap hang on. I got this, alright. Let me handle this for a minute."
Steve is panting in his ear, gripping Tony so tight that he probably has bruises on his hips already. Tony reaches back again and guides Steve back into his body, moaning at the press again. He takes a second, feels Steve pulse against his hole and feels how tense he is against his front. He reaches a hand up to run fingers through Cap's hair.
"It's alright, we'll get there. Just- gimme a sec- ohhh fucking shit there we go-"
Tony keeps one hand behind himself, holding Steve in place, as he carefully folds his legs and lets gravity force more and more of Steve into himself. Fuck, it feels even bigger than Steve's hand, whole and there and still fucking pulsing in him. God he can feel the vein beating against his body.
"Sssshhit shit shit fuck you're so big oh holy fuck how- how do you live with this- mmmnn- monster in your pants all the- hooo fuck-"
Steve keeps a solid grip on his hip, his own twitching left and right to keep from thrusting into Tony, a notion he really appreciates. Because he's starting to regret this. It just keeps going, reaching deeper than Steve did before and the stretch is starting to hurt. Fuck, this was a really bad idea. Tony's never had more than a few experimental fingers up his ass, and definitely never had something this damn deep in his body.
He has to pause a few times to remember to breathe, then starts to feel a bit of desperation when he feels how much is left. His legs are straining from holding him up, and he bites down on his lip to keep tears from leaking. Fuck, he's not a quitter, Tony Stark has never quit on anything in his life, he sure as hell isn't going to start now.
"Tony- Tony maybe we shouldn't, you're going to get hurt-"
"Shut up."
"Tony- ahh f-fmm-"
"I said shut up! I can-"
"Tony!!"
Tony has a sudden spark of stubborn rage and does the stupidest thing he's ever done. He slams himself down the rest of the way, his ass colliding with Steve's hips and his body grips around Steve like a vice. They both practically scream as they frantically grope at each other, Steve's hands wrapping around his back and Tony's fighting to get traction on Steve's shoulders and shield. Fuck fuck fuck that was a mistake, it feels like he just punched a 2 by 4 up his rectum.
They stay like that, holding each other and shaking, for what feels like hours. Slowly, the sharp pain disperses and Tony is left feeling unnaturally full. His ass flexes around Steve and Tony moans loudly as a bolt of pleasure sets his body on fire.
"T-Tony?"
"Mghhh... Fuck... F-Full..."
Steve tries to pull him back to look at him, making both moan as it jostles Steve inside of him. Tony runs a hand down Steve's chest and to his own stomach, feeling the need to massage away the feeling.
He freezes. Steve barely has a second to make a concerned noise before Tony grabs his hand and drags it up to the prominent bulge in his gut. Steve just freezes with his palm resting over his own dick through Tony's stomach. That thought it so much hotter than Tony ever expected. Steve lets out a shuddering breath and adds a small bit of pressure, making Tony gasp and moan. He carefully begins to massage the bump and skin around it, leaving Tony as a moaning mess, gripping Steve's shoulders desperately.
"Steve- Steve move-"
"Are you- are you sure? We don't have to-"
"If you don't move right fucking now I am going to leave you blue balled and alone. Move!!"
Steve ducks his head down into Tony's shoulder and moves his hand back around to Tony's ass. His fingers wander around where maybe half an inch is out of Tony, presses against the stretched skin, and groans.
"God, Tony, you're amazing. No one's ever taken all of me, you know that? You're the first. Fuck you're so sweet, Doll, lettin' me have this."
Tony feels a strange sense of pride and possession at that knowledge. He's the first and only to take all of him, that means Steve is his. This is his. The thought makes him squeeze around Steve again and finally spurs the man into action.
Steve tucks his arms between them for a second before he wiggles them underneath Tony's thighs. His elbows hook under Tony's knees and he brings his hands around to cup Tony's ass, effectively folding him in half. Tony's feet hit the back of the box hard enough to sting, but he ignores it in favor of pressing his arms between Steve and the shield to keep himself in place.
"Okay. Ready?"
Tony nods against him and wiggles his hips in invitation. Steve squeezes his ass and then lifts Tony up. The drag is, by far, the absolute best thing Tony has ever experienced. Why didn't they do this sooner?
Both moan loudly as Tony drops back down onto Steve's dick, feeling his skin stretch on his stomach as the head presses against his organs. Slowly Steve sets a steady rhythm, being careful not to break Tony as he rolls the man's hips against his own. Tony is far beyond words, nothing but vowels and moans spilling from his mouth as he takes all of Steve over and over again. Still, he wants more.
And he can be demanding even without his words. He reaches an arm down, waiting until Steve lifts him up again before quickly wrapping his hand around the base and squeezing. Steve yells and his hips twitch forward.
"Wh- Tony? Is something wr-"
Tony gives Steve's dick a firm tug, moving his hand away quickly when Steve's hips snap forward. He moans loudly, pressing his ass down hard in show. Steve gasps and shivers before hesitantly rolling his hips to meet Tony's. Tony squeezes down in appreciation, bouncing his hips as much as he can and corralling his tongue into cooperating.
"C'mon, Captain, you can let go. Take me, fuck me, fill me, please!"
"T-Tony-"
"Make me yours~"
Steve growls and adjusts his grip, digging his fingers in more as he lifts Tony up again. This time, the slap of skin stings when they roughly connect. Steve completely drops his control as he curls over Tony more, his hips pumping into Tony at a superhuman speed as Tony just holds on as well as he can. He's just along for the ride now and fuck he loves it. Every nerve in his body feels like an exposed wire, sparking and burning.
He's already on the edge when Steve adjusts them and curls over Tony more, and his dick presses against a spot inside Tony that makes his vision go white. He's pretty sure he screams, he can feel when he clenches around Steve like a trap. His neglected dick spurts between them, soaking Tony's shirt and staining Steve's uniform.
Just as Tony returns to his body, Steve yells out something that sounds more like a roar than a groan, and Tony feels Steve's dick literally pulse with cum. With every wave of heat pushed into Tony, Steve expands and throbs inside of him. He's pressed right against Steve's hips, nothing is escaping, and Steve is so deep in him that he thinks nothing could get out anyway. Steve stays curled over him, hips hitching slightly and dick pumping load after load of cum into Tony. Hell, he's pretty sure Steve came more than once with the way he'd suddenly moan and squeeze Tony.
Steve comes for something around 10 entire minutes, moaning and mumbling, and Tony has never felt so fucking full before in his life. He feels like he ate a 5 course meal, twice, by the time Steve lets go of his hips.
"Mgh... Fuck... Tony? Are you okay?"
"Think I just became religious. Cause I think 'm in heaven."
Steve's skin heats up, probably blushing, and he laughs weakly.
"Not quite. Uh. Sorry about that. I've never... Oh my god."
Steve has brought his hand between them and sounds slightly horrified. Tony moans when he feels Steve's hand press against his distended stomach. Fuck he's so, so full.
"Oh my god, are you okay? Holy shit, I've never come that much before! Does it hurt? Shit, let me pull out-"
"NO!!"
Steve freezes, hands gripping Tony's waist.
"Like it, stay. Fuck, cognitive functions need rebooting. Just, stay, yeah? Feels good, trust me, feels reaaaally good. I'm all full of you."
"Oh god, Tony, you can't say that."
Despite the protest, Tony can feel Steve twitch inside of him. Even soft he's fucking massive.
Okay, calm down. Back on track.
"Right, right. Hang on."
Tony reaches between Steve's shoulders and shield to manually release the disk and carefully moves it back over their heads. Tony curls further into the man when Steve grips the edges of the shield and begins to hack away at the ceiling. Slowly, the metal gives, and both hiss at the light that pours into the dark space. Steve reaches through the tear and rips the top off like a can of beans.
Tony is right about to pull himself off and get out when Steve wraps an arm around his hips and stands up, still completely sheathed inside of Tony. That shouldn't be as hot as it is.
"Do you think you can walk?"
"Probably. Here, put me down."
Steve maneuvers them to have Tony's back against him and slowly lowers Tony's legs to the ground. He still hasn't pulled out, which is very distracting. Tony's legs wobble and he finally gets a good look at his stomach. His previously loose t-shirt is stretched tight over his stomach, which is so full that he can barely see his own dick past it.
"Oh shit."
"Y-Yeah. Sorry. Um. This- this might be a bit messy."
Tony swallows but braces himself against Steve's arms, gasping and moaning as Steve slowly pulls himself out. He expected a rush of fluid, like he's seen in porns, but there's just a bit of lotion that drools out of him. The liquid inside his stomach doesn't so much as shift.
"I... What? That's not right."
Tony doesn't get a chance to respond as Steve immediately pushes 3 fingers back up his ass and starts to prod around. His legs quake as he tries to keep himself upright and he moans as the dry skin rubs against his abused walls.
"Steve- Steve stop- Steve oh my god quit it-"
"Sorry, sorry, just. There's something blocking it, that wasn't there before, right? Your body shouldn't be just... Holding it all uh... Holding it in."
Steve sounds a bit distracted by the idea, and honestly so is Tony. He pulls his pants back up, ignoring the buckle after the first uncomfortable attempt of closing it over his swollen stomach.
"Well, at least I won't be a mess on the way back. Maybe it's another fun super serum fact."
"Tony."
"What? Peak human perfection, yeah? Maybe your body is designed to impregnate every time. Would fit the bill."
Steve chokes at the idea, hands twitching towards Tony before he stuffs himself back into his uniform and straightens up. He coughs into his fist and looks away when Tony turns to him with his shield in hand.
"We should still try to figure it out when we get home."
"Aye, aye, Captain. Now come on, we're still kidnapped and you've put so much baby in me that I can't wear a suit if it's even here."
Steve coughs violently and flushes as red as his gloves.
"So let's blow this joint and go home. We're both sticky and I want to lay down on something soft."
"Right. Right, okay. Let's not tell the others about this."
"Oh fuck no, they'd never let us live it down."
Eventually, they make it back to the Tower and manage to avoid the rest of the team as they trek down to Tony's workshop. He was right, the natural plug that Steve can apperantly create went away on its own, after about 8 hours of Tony craving a burger but fearing he might pop if he ate. They have a talk about where to go from there, which is only interrupted twice with impromptu fucking, and finished with Steve tucked firmly inside of Tony again.
A week later, they send AIM a fruit basket with a bomb in it.