@winterironmonth prompt -Â NSFW Saturday: Trope/Kink, Word
Trope/Kink: Size Difference
Iâve written omega/omega, now Iâm gonna try alpha/alpha I think. Also Tony would react this way to anyone he thought loved him which is probably very sad, but Bucky isnât going to think about it too hard right now because he wants to enjoy the gift that is Tonyâs trust. Was gonna shove in some more size difference but didnât want to write foreplay lol right now lol. Donât forget to blacklist âlong postâ and âlemonâ if you donât want to see it!
Their ruts rarely coincided. It had only happened once before, at the beginning of their relationship, when it was too new to spend together even if they hadnât both been alphas. Since then, it had been one or the other, with the non-rutting partner taking the place of the âomegaâ for the coupling. Theyâd synced up again, though. Bucky had worried they might attack each other, both of them flooded with hormones like this. Tony wouldnât have stood a chanceâor heâd call the suit, and then Bucky wouldnât have.
He shouldnât have worried. Tony had lunged for him with a snarl as soon as heâd seen him, but he hadnât summoned the suit, and Bucky hadnât felt the need to engage the metal arm. It had seemed⌠fun, almost, wrestling for dominance. Tony had thrown a few punches, but Bucky had blocked them easily, and then heâd gotten Tony pinned, his larger body covering Tonyâs easily. And while Tony had snarled and thrashed as Bucky had lubed him up, stretched him for a knot, now he was soft and sweet, eyes half-lidded as he stared up at Bucky, lips spread into a wide, fuck-drunk smile as Bucky ran a hand over his bloated stomach.
âGood?â Bucky managed to grunt. Tony hummed, sounding very pleased, but that was the only answer he got beyond Tonyâs sticky thighs spreading a little wider. Bucky couldnât help the guttural growl that escaped him at the motion, tightening his grip on Tonyâs wrists as he fucked into him harder. âGonna knot you again, doll.â
âKnot me,â Tony echoed dreamily, arching his hips up, as if this wasnât the fourth knot Bucky was stuffing into him.
Bucky let go of his wrists to clutch at Tonyâs hips, tipping them up for a better angle as he pounded into him, knot butting up against Tonyâs swollen rim with every thrust. He couldnât help another guttural growl as Tonyâs thighs fell open wider, as if he was simply a doll to be moved around for Buckyâs pleasure, a perfect omega hole for him to breed despite not smelling of any slick. Tonyâs cock even had a bit of a knot forming where it was bouncing against his rounded belly.
Bucky adjusted his grip so that Tony was braced properly, then shoved deeper, knot catching, stretching, pushing. Tony let out a broken little sound, just this side of distressed. Then the noise turned into a guttural groan as Buckyâs knot shifted further, past the resistance, and his body sucked it in deeper, locking it in tight. He trembled, overwhelmed, even as his hips rutted to helplessly chase after his own orgasm. Bucky leaned down to kiss his gasping mouth and finally released one of Tonyâs hips to wrap his fingers around Tonyâs cock, stroking it gently until Tony was whimpering into his mouth. Then he slid his hand down further, curling his fingers around Tonyâs knot and giving it a squeeze, tightening his grip until Tonyâs hips jerked and he let out a broken little hiccup as he came.
Bucky collapsed on top of him as if his strings had been cut, mouthing at Tonyâs throat, catching with his teeth. âDoing so good for me,â he finally managed, because Tony was, so open and sweet for him, taking knot after knot.
The serum gave him a shorter refractory period even when he wasnât in rut, but Tony took it like a champ, insatiable, almost ravenous in his desire to be filled whenever Bucky was on top. Tony was always generous, no matter what position they were in, but he seemed even more willing when Bucky was curled on top of him, protecting him from the world with the bulk of his body.
Tony started kissing him back after a while, lips trailing over his forehead and cheek where he could reach without having to move much. Bucky lifted his head to kiss him on the mouth, slow and soft, before finally breaking it again to carefully lean back, giving him a little breathing room.
Tony blinked up at the ceiling, languid and satisfied. Finally, he let out a little sigh and huffed, âFull.â
Bucky couldnât help a smile, rubbing a hand down Tonyâs bloated stomach again. âNice and round for me.â
âFull,â Tony huffed again, and this time it sounded like a complaint.
Bucky pressed another kiss to his mouth, then mumbled, âIâll get you to the bathroom before I tug my knot out and we can relieve some of that pressure, yeah?â
Tony offered him a short nod, but that was it. His hand drifted down to cover Buckyâs on his stomach. He let out a quiet mewl when Bucky pressed down lightly, frowning. âNgh.â
âBet youâd give me a pup every heat with how well you take it,â Bucky said, smiling a little.
âFuck off,â Tony mumbled, rolling his eyes. Then he paused, brows furrowing together as Bucky ran his hand up and down his stomach again. âWell. I mean. Of course I would. Iâm the best at everything.â
âIncluding being humble,â Bucky said, smile growing. He began to sit up, so he could adjust his position.
Tony wrapped his arms around his neck quickly, pulling him back down with a muted whimper. âNo.â
âIâm not going anywhere, doll,â Bucky assured him, arms coming up to wrap around him. âIâm just cramping a little. Wanted to adjust.â
Tony made another noise of distress and cuddled closer. âI can⌠Please.â
Bucky pressed a kiss to the side of his head. âOkay, okay. Here we go. Hold onto me, doll.â
Tony clung to him tightly, whimpering as Bucky carefully took his weight and turned so that he was the one on his back, laying Tony down across his chest carefully. âUgh, full,â he moaned, letting go of Bucky to push himself up a little.
Bucky took the opportunity to push himself up the bed and get himself into a seated position against the headboard, cradling Tony against his chest again. This time, he got a pleased sigh, which he rewarded himself for by nosing at Tonyâs swollen bonding gland. âWanna bite you so badly,â he moaned, hands running up and down his back.
âSo do it,â Tony said simply.
Bucky froze, stunned at the offer. It was dangerous for an alpha to bite anotherâs bonding gland, no matter how much they loved each otherâit would release a rush of hormones that caused them to be even more protective of their omega and attack any interloping alpha they scented. Some couples managed it, but it was only after years of love and trust. Tony and Bucky had only been going together a couple years, and they both had their own trust issues. He couldnât imagine biting him and having a good outcome.
But now he also couldnât imagine not sinking his teeth into the swollen gland, Tonyâs arms around his neck, belly swollen with his spend.
âWhat if weâŚâ Bucky began, hands clutching at Tonyâs hips tightly. âWeâre tied. I donât want to start anythingâŚâ
âYou held me down once,â Tony pointed out. âI wonât bite back, if youâre worried.â
That wasnât what he was worried about at all, but Tony sounded so reasonable⌠âStillâŚâ
Tony leaned back to raise his eyebrows at him, as reckless as he always was as he put his hand on his stomach and indignantly asked, âYouâre not going to bond with the other parent of your whelp?!â
âYouâre not an omega,â Bucky said, but a growl was welling up in his chest at the thought, eyes darting down to Tonyâs hand and then back up. âTony.â
âIt will be fine,â Tony promised, and he sounded so sure about it.
Bucky leaned in and nosed at the gland again, mouth watering at the idea of biting into it. He shouldnât. So much could go wrong. But then, it could have gone so wrong at the beginning of their ruts, too. He ran his tongue along the gland gently, consumed be the taste of sweat, the tang of sex heavy in the air. He felt Tony shiver and couldnât help allowing the growl to bubble up, possessive and wanton as he pressed his teeth to the skin, waiting for Tony to flinch or growl back.
Tony did neither, instead tipping his head back to give him more room to work with. âBuckyâŚâ
Bucky sank his teeth in before he could even think to stop himself, clutching Tony to him, ready to grab him and hold him still if he tried to attack. He neednât have worried, though, because Tonyâs only response was to stiffen, then fall limp in his grip with a whimper, cock twitching between their stomachs. Bucky groaned, mouthing along the gland a little longer, then leaned back, looking down between their bellies to see Tonyâs cock hard again. âYou like that,â he said, surprised, then growled again, tipping his head back to give Tony a sharp smile. âYour neck is gonna look like a chew toy by the time Iâm finished with you.â
âI still wanna go to the bathroom before your next knot,â Tony said, letting his head loll to the side again in offering. âI might actually puke if you put another load in me with all this mess.â
âAs long as I can keep sucking on your bonding gland, maybe we can put your dick in me once or twice,â Bucky offered magnanimously, before he latched onto Tonyâs neck again, worrying at it with his teeth. âOnce the hormones wear off a little more.â
Tony jerked in his lap with a surprised moan, leaning more of his weight against him. âOh⌠Yeah, sureâŚâ
âFuck, thatâs so hot,â Bucky groaned against his throat. He had the thought of offering up his own bonding gland to Tony, but he didnât trust himself as much as Tony apparently did. He didnât want to even think about what might happen if he reacted badly. He reached down to wrap his fingers around Tonyâs cock. âGonna come again for me?â
âKeep your mouth on my neck and find out,â Tony purred, as if he wasnât the one who was putty in Buckyâs hands.
It was truly unfair that Tony could manage to sound like he was in charge and in control when he was stuffed full of cock and limp in Buckyâs arms. Bucky doubted heâd ever be so articulate in the same position. âSo unfair,â Bucky mumbled to himself, before he adjusted his grip and started stroking Tony in earnest.