#i say this knowing full well I'll not change and will suffer until square decides to give us scard but oh well

[the-mad-starker]

Starker Smut: Homemade

Length: 8.2k

AO3 Link

Prompt: Omega mommy Tony and alpha son Peter who finally starts his rut. Tony ends up pregnant, and Tony loves feeling the life inside him, that feeling amplified by knowing that the pup(s) have part of Peter in them. When Tony starts lactating, Peter likes to nurse while he fucks his mama, caught between the safe, warm, feeling he gets from drinking from his momma and the desperate, near-frenzied mindset he gets fucking him.

Ive been MIA. Lack of motivation + IRL stuff = one very sad mads. So I finally finished this mommy kink fic yayy. Also using this as a fill for Starker bingo, X-ing out my Incest square 😱 anyone curious about my card can see it in the AO3 post.

Notes: ABO Dynamics, Incest (normalized sex setting), Omega Tony, Alpha Peter, intersex, marathon sex, knotting, breeding, impregnation, pregnant sex, lactation, ruts, lingerie, and so much mommy kink

Note 2: Not explicitly stated but throwing in the underaged warning here.

Also before anyone jumps me for breast feeding info/correction, I was too lazy to do a thorough research into this so I'm tweaking it in this omegaverse lol

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Tony's actually in a meeting when he gets the text.

It's from Happy, his loyal but too serious bodyguard slash chauffeur.

Boss, i just dropped the kid off at the house. He literally begged me not to tell you, but he isn't feeling too well. - HH

Tony frowns at the message and thinks for a half second before he shoots a text to his son.

Hey, kiddo. How's class going? - TS

There’s silence for a few seconds before his inbox is flooded in Peter's usual lightning fast but short sentence texts.

…

...Happy told you, didnt he

im sorry, i wasnt feeling good

They said I should just go home

And I told Happy not to tell you

he promised but I guess he lied

I'm fine, really just need to nap.

Sorry, mama.

It's the last line that gets him because lately, Peter has been trying to stop calling him mommy or mama. he wants to be more formal, more grown up and just call Tony mom, but it slips when he's feeling particularly vulnerable.

Meaning his baby needs him right this instant.

Tony excuses himself from the meeting and texts Happy to bring him home. Smart man, the beta is already waiting for him when Tony strolls out of the building.

He makes it to their home in Queens in record time but doesn't text to let his son know. Peter, despite being a clingy child, has some guilt about pulling Tony away from his job. The omega doesn't know where it comes from since he has always reassured his boy that he would move mountains for him.

Tony loosens his tie, slipping off his shoes when he enters their home.

There's a scent neutralizer in the air so the omega can't tell from scent alone if his son is in distress. Scent neutralizers in the ventilation but the walls aren't soundproof. The only ones that are soundproof are Tony's bedroom for… reasons... Not that he needs it. The omega hasn't had a partner for heats or otherwise since Peter was a baby.

He approaches Peter's bedroom and pauses when he hears sounds from inside.

A soft moan. His hand stills on the doorknob before he decides to knock.

He gets a soft yelp and the sound of something crashing on the floor. Tony raises a brow but schools his expression when Peter cracks the door open.

"Mama?" Peter whispers incredulously. He licks his dry lips and blinks too rapidly. "Aren't you supposed to be in a meeting…?"

Normally, Tony would have a sassy reply instantly but something… It's… It's hard to pinpoint really, but the scent is familiar and it makes Tony's insides clench and his legs feel weak. He hasn't responded like that in so long and the last time–

Tony's eyes widen when the realization hits. It's all processed in less than a second and his instincts surge to life inside him.

"A little birdie told me you aren't feeling well," Tony says coyly, leaning closer.

He gets more of that scent, spice and musk… Knows by the way Peter's lips quiver that he's catching his omega mother's scent at the same time. Peter's eyes dilate, the pupils expanding and eating up the brown of his irises. Brown eyes that he shares with his omega parent.

Does Peter even know what Tony's scent means?

If he's presenting today, the deeper notes in Tony's scents might still be a mystery. In that case, his body would be responding but Peter wouldn't know, consciously, why he's so aroused. Why Tony's scent is turning him on so much when just yesterday, his nose only registered comfort and security.

"I told Happy–" Peter groans, "Mom, I'm okay, I just need a minute."

Tony smirks but when he tries to nudge the door open, Peter holds it steady, a soft whine of, "Mama, p-please–"

He abruptly stops talking when Tony caresses his cheek, subtly posing his wrist right next to the boy's nose. He's feeding his presenting boy the scent of a viable omega. It's a dirty trick but he just wants to help and possibly ease his son's suffering.

"Baby, I can smell it," Ton says gently, "You're becoming a man… An alpha."

"Mama…" Peter groans, breathing the scent in with greedy lungfuls of breath.

"It hurts, doesn't it?" Tony encourages his son to speak honestly.

Peter swallows, so unsure, but he whimpers when Tony continues stroking his cheek, soothing and arousing at the same time.

"It does," he admits, "but… but… I…"

Tony's poor baby is struggling.

"Do you want Mama to help, darling?" Tony coos to his son. "I can make the hurt go away."

"You can?" Peter looks at him with wide eyes, full of trust and innocence.

It makes Tony's heart beat so harshly against his chest. His body responds too, but he's already been dripping slick since he smelled his son's arousal. The scent of an alpha in entering a rut. It's even more potent for a first time presented. It's even more arousing that it's his baby boy, his sweet Peter.

"Open the door, baby," Tony encourages, "I'll help you feel better."

Peter's breathing escalates, his body practically vibrating with unspent energy. Tony can read all the signs and more slick drips out of him when he does.

His sweet Peter is going to be such an amazing, good alpha.

His son opens the door and Tony almost sinks to his knees right then and there. If he thought Peter's emerging scent affected him before, it sends his head spinning. It's intoxicating.

Alpha… alpha…

Tony breathes it in and takes a few seconds to acclimate himself. Then, belying the struggle he's feeling, Tony saunters into the room and promptly sits on his boy's bed, crossing his legs. It helps to hide the trembling and the urge he has to just lay back and offer himself as a rut toy for his son.

Peter, sensing the change in his omega mom, hesitates when he turns.

It's obvious why. His erection is tenting the soft pajama pants he has on and he's trying to hide it behind his hands. There's a light flush on Peter's cheeks, such a pretty pink that Tony wants to snuggle the boy close.

"Well," Tony smiles and it's a sultry thing, an expression that Peter's never had directed at him. It makes his son push out even more pheromones, trying to lure in the omega teasing him. "We're not gonna solve your problem with you all the way over there. Come closer, baby."

Peter does step closer then takes another until he's standing right in front of Tony. The omega gently eases his son's hands away.

"Need to see what I'm working with here, kid," Tony tells him.

Slowly, he tugs his boy's pajamas down, letting the fabric drag over the erect length. His son's flesh is uncovered, slowly, like a grand reveal and Tony's mouth fills with saliva with every inch he exposes. He guessed the size a bit, just from the outline, but that doesn't compare to what he sees.

Tony knows right away that Peter has a pretty cock. The flesh itself is flushed a gorgeous pink, just like the blush on his cheeks. The girth isn't something to scoff at. It looks like his presentation hit Peter like a truck, giving him all the tools needed to be an alpha stud despite still being Tony's baby boy.

The omega eyes the loose skin around the base. For a kid who hasn't popped his first knot, Tony can already tell Peter's knot will be massive. When the band of his pajamas finally slips over the tip, Tony's breath catches when the entire thing is freed. It's so hard that it springs up but the weight of it is too much to curve up against Peter's belly. His son's cock bobs in the air, all flushed and needy, drooling for his omega mama's touch.

Tony takes a moment to admire it. A soft sound catches his attention and he looks up to see Peter's embarrassed face. The blush has only deepened and the color has crept down Peter's neck and chest, disappearing beneath his shirt.

"You've grown to be such a big boy," Tony murmurs, rubbing circles on the hard jut of his hip.

"Mama…" Peter whispers, a tiny bit embarrassed. But there's a hint of pride there like he can't help being happy that Tony compliments him so.

"It's a good cock," Tony assures him, "You'll make plenty of omegas cry on this thing…"

Another soft embarrassed sound then his sweet son admits, "I don't… don't really want any other 'mega, mom…"

His son is such a sweet boy. Tony feels his heart twist because Peter's always been such a good boy, always thinking about his omega mama, always so sweet and kind. Some young omega will steal Tony's sweet boy away and that's… that's life.

Tony doesn't say such things though. They'll come in time. For now… He'll take what he can get and teach his son what he wants to know.

"What do you think…?" Tony says casually while he wraps his hand around Peter's cock. "Think you can hold out for me, kid? Or are you feeling sensitive…?"

He gets his answer as soon as he gives the firm cock a single stroke. It twitches wildly in his hand, drops of precome beading up quickly at the slit. It drips down the flushed head and just as quickly, another drop forms. It keeps going, fat cloudy drops that gather and overflow so that it drips steadily.

"I…" Peter whines, hiding his face behind his hands again. He peeks through his fingers, "I don't know…"

Tony tries to be gentle but his baby isn't too far from his first orgasm by another's hand.

"It's okay, sweetheart," Tony tells him as the boy shuffles closer. His hand works over Peter's erect cock, jerking him off with firm but quick strokes. "Let it out, little alpha… Let it out for mama…"

It doesn't take more than a few strokes before Peter's body grows taut. His cock twitches and pulses in Tony's grip, balls drawing up quick. Tony doesn't stop and soon, his son is bucking up his hips, soft gasps and a cut off "Mmph…!" before Peter spills all over Tony's hand.

The load his son releases is so much… 

"Fuck, baby," Tony says, astonished at the sheer amount of come, "you were really backed up, hmm? You should ask for mommy's help if you need it... Don't want my baby getting so frustrated…"

Tony milks it all out of Peter, massaging and encouraging the soft little baby knot at the base of his cock. He ignores the fact that his son's come makes a mess, some of it getting on his designer suit and dripping all over.

Peter slumps against him, sinking onto the bed. His head falls on Tony's shoulder and he buries his face against his Mama's arm.

"Isn't this wrong, mama…?" Peter asks softly.

In that quiet, whispered sentence, Tony hears all his boy's doubts and fears. Tony can't bear to have his kid upset, so he tips Peter's face towards his and gently, lovingly, kisses the boy on the lips.

Peter's brown eyes, so like his own, widen but he doesn't scramble back. If anything, he melts into it, hands twitching at his sides, wanting to touch but unsure of where to place them.

"I love you, baby," Tony tells him. Then he smiles a bit wryly, "You love me too, don't you…?"

For a second, Peter looks a bit offended at the question before he eagerly nods, replying, "Of course, I do, mom."

He nuzzles Tony's cheek then brushes his nose against his jaw and then his neck…

"You're perfect… my perfect mama…" Peter tells him, "I love you so much… There's no one I'd love more than you…"

Tony melts and tugs Peter down onto the bed with him. The young alpha curls up against his side while Tony kicks off his ruined pants. Since those are already gone, he strips off his suit jacket and the vest beneath. As he's unbuttoning his shirt, he feels curious fingers trace along his underwear.

He looks over his shoulder, raising a brow at his touchy feely son.

Peter gives his mama a shy smile, "It looks nice on you…"

Tony looks down, grinning at the hot red lace underwear he's wearing. He hasn't had an alpha in years but he still likes to feel sexy beneath his clothes. He's also glad he wore something nice since Peter seems to love it.

"Thank you, baby," Tony says leaning down and kissing the top of his head.

He leaves his shirt on but it's entirely unbuttoned. Tony is, perhaps, a bit eager but Peter certainly appreciates it. He tilts his face up, lips puckering a bit in expectation. Amused but not willing to turn down the request, Tony takes Peter's lips in another sweet kiss.

He's practically leaning over his son when he feels Peter's cock swelling against his thigh. The joys of having such an eager and young alpha…

Peter had just started getting into the kiss when Tony pulls away.

"Mama–" Peter protests but Tony shushes him with a finger to the lips. When his boy pouts, Tony takes his finger away and pecks him on the lips.

"There's no rush, sweetheart," he tells Peter, "But hmm… How about we make you a real alpha, hmm? Would you like that…?"

Peter's wide but eager eyes are answer enough and yet, he seems conflicted.

Tony reads him easily and kisses him softly.

"Still think it's wrong?" He raises a brow.

Peter's eyes are wide and even though he shakes his head rather enthusiastically, there's still that tiny bit of doubt that shadows his face.

He wraps an arm around the boy's shoulders and gently eases Peter down on top of him. His legs spread to accommodate his son, knees cradling the boy's hips.

Peter's cock presses between his legs, firm flesh poking and dragging along his clothed pussy. It makes Tony shiver in anticipation.

He reaches between their bodies, leading his son's cock where he wants it… The tip nestles against the fabric, precome wetting the lacy material.

"Pete… You're my baby," Tony says. Their eyes lock, alpha and omega, mother and son, as Tony teases him. He rubs against his son's cock, dragging the wet tip up and down along his slit. Even with his panties in the way, it's such an intimate feeling.

He nuzzles against the boy's cheek, purring, "Part of you should always be inside me… So, do it, baby, it's okay… Put your cock inside mommy."

He wants to do badly, Tony could see it. His eyes are hooded and his lip caught between his teeth. Tony only knows he's breathing because they're pressed close.

Peter's so close to getting his first taste of omega pussy.

"...What if I'm bad at it…?" Peter mumbles then, the last thing holding him back.

He can't take his eyes away from Tony though and the desire is there… Oh God, Tony hasn't felt this kind of mutual attraction in years. His baby alpha is just so eager but so worried about disappointing Tony… It's just so sweet, so typical of Peter.

"You're a Stark, aren't you?" Tony gently teases, "Being great is in your blood."

Then Tony smirks, a confident grin that trembles when he feels Peter's hips shift forward, seeking the warmth of his body.

"Besides…" Tony murmurs as he pulls Peter closer. "I'll teach you, baby… Don't worry…"

He squeezes the alpha's cock, stroking along heated flesh. It's dripping again, so much precome and fluid, his son's cock naturally providing lubrication so it could penetrate any tight hole.

Tony's pussy clenches, slick and wetness just dripping right out of him. This entire time, he's been so focused on Peter that he's been holding back his own wants. But this… He knows it's going to be amazing.

He's so wet and his own little omega cock is stiff and aching. It's nothing compared to how his insides clench in anticipation, eager to be split apart and seeded thoroughly.

Screw the fact that he hasn't bothered with birth control in years, there's always the after morning pill. Unless…

"You wanna be safe and use a condom, baby alpha…?" Tony asks. He hates it though, loves knowing his partner is bare inside him, but if his son wants it…

Peter looks torn and says forlornly, "Do I have to…? I haven't…"

"You really should but since it's your first time…" Tony gives in easily and then, pulling his panties aside, exposes the tight little hole of his pussy for penetration. He notches the wet tip right there and murmurs, "Push in a bit, Pete…"

His boy complies and oh… Tony groans at that initial stretch, his son's fat cock nudging its way inside…

"Mama…" Peter gasps, a strangled sound as he gets his first taste of Tony's omega pussy.

His hands fly down to Tony's hips, fingers clamping down. Once the tip is swallowed down, Peter's control frays and splinters, coming undone as his hips buck up. It's harsh and uncontrolled as the alpha tries to shove into Tony's tight body.

"Mama… mama .." Peter almost pleads but Tony's a bit distracted himself.

The omega is caught in the sensation of his pussy being split apart. In his younger days, sex was easy and he was used to it. It's been… years and Tony's definitely not used to it. His tight little pussy struggles to even take Peter's cockhead and Tony breathes through the stretch.

It's not unpleasant, it's just a lot… Especially with Peter trying to greedily fuck the rest of his length inside without giving Tony time to adjust.

"Mama… I can't… gotta…" Peter's words are incoherent babbling but actions speak louder than words. With a sob, Peter forces the rest of his cock inside his omega mother's pussy.

To Tony, it feels like the breath is punched out of him. He grips his son's broad shoulders and his entire body shudders, clenching down tight on Peter's cock.

It feels so good after the initial push that Tony's body goes limp. His son covers him, dark ravenous eyes staring down at him from above.

"It feels… so good…" Peter groans, eyes rolling back, and yet… he's staying so perfectly still like he can't move. Or refuses to.

Tony gazes up at his son with hooded eyes. His pussy clenches on the thick length, tiny little hole tight from lack of use. As he lays there panting, split open on his boy's cock, Tony has a feeling that he won't be left empty now that Peter's had a taste… He knows how alphas get and the look in Peter's eyes tell him the same thing.

There's this dazed look in Peter's eyes. His mouth trembles in pleasure and his entire body strains with the need to move.

"It's okay, baby," Tony encourages, wrapping his legs around the boy's waist. "C'mon, Pete… Move… I can take it… was made to take it…"

"Mama…"

It's breathed out like a prayer before Peter shudders. He squeezes his eyes shut but starts to move, hands clamped down bruisingly tight on Tony's hips as he chases after his own pleasure.

He fucks his mama with clumsy but eager thrusts. Tony welcomes every single one, moaning into his baby's ear and encouraging him with filthy words.

"Your cock feels so good, baby…" Tony says breathlessly. "Tilt your hips like– oh, fuck, yes… Like that, baby. Oh– yes, just like… that…"

Peter tries his very best to please Tony, but being so inexperienced, he can't help but come fast. He tries to warn his omega mommy but the words get caught in his throat.

"Mama…!" Peter shudders as he empties himself inside. 

He unloads with a groan, pushing deep inside and spilling so carelessly into his mother's unprotected womb. The body under his grows so tight that it steals his breath.

"You're knotting, Pete, oh… oh, fuck–" Tony groans when he feels his son's knot start to swell.

It happens quickly, the knot filling and rubbing against Tony's insides until it's too large to pull out. His son is lost in the pleasure, completely overwhelmed as he dumps a nice thick load inside.

The realization that he's knotting comes as a surprise even though Peter knows that it logically happens. His mama feels so impossibly tight around him and it's hard for him to formulate a thought, much less words.

Thoughts about pups and the dangers of unprotected sex don't even register to the rutting alpha. All he knows is the amazing feeling of his come rushing out of him and shooting out… The way it leaves his mama so wet, he could feel it… His come crowding around his sensitive cock as the knot keeps it all plugged inside.

Tony shivers when he feels his son's cock pulse inside him. His eyes slip closed for just a moment and he images it… Peter's alpha cock inside him, white spilling everywhere as his son breeds him.

He's not on birth control and the omega shudders at the terrible thought. His son knocking him up. His hand trembles as he pets Peter's back, fingertips grazing up and down as the young alpha continues to pant against his neck.

"Mama… I'm sorry…" Peter groans when he finally realizes what he's done, "I came inside…"

That dirty wrong feeling grows and his pussy clenches down, milking every drop from his son's cock.

"It's okay, baby," Tony tells him. He turns Peter's face towards his and kisses him to show he's not mad or upset. "I've always wanted to give you a little brother or sister…"

It's said mostly as a joke, as something to show Peter that he isn't mad about it. But then Tony feels Peter's cock twitch violently inside him and he wonders…

"You like that idea, baby…?" Tony says out loud, eyes searching his boy's face. "Like the idea of knocking up your omega mommy?"

The sound Peter makes would be embarrassing any other time but Tony finds the high pitched whine cute. It tells him how badly his baby wants it… Wants to knock his omega parent up.

Tony sighs, feeling deliriously happy that their desires are in sync. He's been holding back, worried that Peter would just want some practice… But now…

"Move your hips, Pete…" Tony instructs. "You got your omega caught on your knot… Gotta keep rutting… Even if it's sensitive… Keep– Oh…"

His son obeys and moves flawlessly, burying his face in Tony's neck. The knot holds true and Tony groans when he feels it tugging against his hole but it's… It's so good…

Peter's youthful enthusiasm comes through. Even though they're still tied, he fucks Tony relentlessly. The knot only allows him an inch or two to move but that's all he needs. His thrusts are harsh and deep as he ruts into Tony's pussy, churning up all that good potent come that he's deposited inside.

Then without instruction, Peter pulls up to his knees, his strong hands dragging Tony's lower body with him so that the knot doesn't get tugged too harshly. Tony's back arches to get that perfect angle and he's seeing stars when Peter starts to hammer inside him..

His son's loud pants and cries of "Mama…!" continue as fucks Tony stupid in his childhood bed. Tony doesn't even need a hand on his own stiff little cock before he's spilling all over his stomach, clear useless drops of omega come spurting out. Peter continues to fuck him, rutting wildly in a way only newly presented alphas can.

Distantly, Tony realizes that the knot has softened… But then Peter whimpers, unhappy when his sensitive little knot slips out and is followed by a flood of his come.

"Baby–" Tony groans but Peter turns him onto his stomach before he shoves back in.

"Again," Peter growls. His cock spears right in, fucking into the sloppy wet insides of Tony's pussy. Then he murmurs, as though apologetic for his tone, "Please, mama… I need it… need mommy's pussy…"

Tony groans, pushing up onto his knees.

"Go on, P-Pete," he allows it, his entire body shaking from the force. "Go ahead, baby… Take what you n-need…"

"Thank you," Peter groans, "Thank you… It's so good, mama… So good… Wanna come inside again… Gonna do it… Gonna come inside mommy's pussy… Get every drop..."

"Do it, baby," Tony urges. "you can, you can… Come inside…"

It becomes clear that Peter isn't thinking of making it good for Tony, not when his thrusts are so rough and uncontrolled. He's just chasing after his own pleasure, hips rabbiting against Tony's ass as he roughly fucks in and out. 

He's utilizing his strength, his speed… His youth that allows him to keep him. His cock is just a blur of motion with how fast he's fucking in and out. It feels too good to stop...

Tony can only imagine just how pink his ass and thighs are from how harshly Peter's fucking him. The sloppy wet sounds make it all the worse… There's come dripping down his thighs, come being fucked back into him, come ruining the sheets beneath them…

Alphas come so much and Tony's son wasn't an exception.

Tony can feel his son's knot again. The initial knotting happened so quickly and Peter had settled deep in his body when it happened.

Being fucked like this… Even while the knot's too small, he can feel it. It pops in and out, pushing and pulling against his hole and it's a sensation unlike any other. 

Tony feels every tug as it grows and grows. He relishes the sensation, knows when his son is ready by the way the thrusts shorten… It's Peter using his freshly fucked hole… Using Tony's body to stimulate the knot so he can come again.

Unrefined and unused to sex, Peter doesn't realize that he's let the knot grows too big until he tries to push in and it's– It's too big.

Tony wouldn't let any other alpha do this, but it's his son and he wants Peter to just enjoy it. H wee can handle a bit of pain, he tells himself.

"D-do it," Tony groans and has a second to brace himself when Peter complies. He pulls back so that the very tip is settled against his opening then he shoves in with a snap of his hips.

Peter grunts while Tony whines, the knot being forcefully shoved in. Another load is deposited and he feels the way Peter spurts inside him, that thick alpha cock pumping away load after load… Trying it's best to fill him up so he gets knocked up.

Tony lays there flat on his stomach, his son pressing him down as Peter purrs, content and satisfied after coming inside twice.

The rut is in no way over but there's some downtime.

Tony grunts as he tries to nudge Peter onto his side. His boy is affectionate and acts touch starved like he can't get enough. He runs his hands over the omega's sweat damp body.

"Can we do it again…?" Peter asks, kissing the back of Tony's neck. His knot is probably ten minutes away from softening and he already wants to fuck his omega mommy.

"As many times as you want, kiddo," Tony says despite wondering if he'll survive his son's rut. "Do you wanna try my ass…? You might like it better."

Peter goes quiet for a moment but Tony doesn't notice. He's too caught up in the afterglow, relaxing in his son's arms as he considers taking the next few days off.

He shivers when Peter's fingers slip between his legs. It's a curious touch, exploring Tony's body in a way he's never had a chance to.

Tony remembers being that young and curious so he lays there, humming whenever a particular touch feels good. Peter's hands on him are almost reverent and it's so feather light when he skims over his omega cock.

Those same fingers skip south, so hesitant, as though Tony would scold him at any moment. They grow a bit more confident when he doesn't, but to Tony's surprise, Peter just rubs around the swollen flesh where his knot is locked.

"Wanna keep doing it here…" Peter murmurs, "If I can… If mama lets me… Wanna keep doing it here…"

Maybe it's not all talk, Tony thinks when Peter mouths against his neck. Tony tilts his head, sighing in pleasure when the alpha runs his tongue over the sensitive skin there.

His natural inclination is to tease the boy with his new obsession but instead, Tony trembles in excitement. He presses his hand over his alpha son's curious fingers.

"Okay, baby," Tony permits, "Mama will let you do it."

----

He should've remembered that his son was very much like him. If he had, Tony may have thought twice about giving Peter free reign over his body.

Paired with a newly presented alpha's determination to breed, Tony finds himself in quite a predicament.

He's not as young as he used to be and he realizes this when Peter shows himself to be quite insatiable. Peter doesn't even bat an eye after going three rounds. 

It helps that those rounds are short. The kid has a crazy amount of stamina in the sense that he can keep going and going and going… But he doesn't last very long during those times. At least, not yet. Peter has plenty of time to build up his experience and by the fifth time, the sensitivity had dulled so he lasts a bit longer.

The rut is harsh and demanding. Tony feels every thrust, every desperate attempt to knock him up. The amount of seed that Peter spills inside him in obscene and so much of it spills from Tony's leaking hole when the knot softens and his son pulls out.

No matter how much is wasted against the sheets, Tony knows there's more than enough left inside him. He wonders if it'll kickstart his own cycle but the thought is a fleeting one. Peter consumes all his time and attention.

It's a fuck fest. A marathon. A full blown alpha rut. And rutting alphas only have one thing on their mind. Fucking and breeding an omega.

Lucky Tony, he's the one who volunteered and gave permission. He loves his son, how could he not?

Tony doesn't regret it, not even when he feels like he's full to bursting. He marvels at the noticeable bulge Peter's come has given him, but this… Letting Peter run wild, it isn't sustainable. Tony would become an incoherent mess, fucked out and his son would probably still rut him, still keep fucking him until the urges were sated.

The omega switches tactics.

In the shower, he redirects the alpha cock to his ass instead of his sore pussy. Peter whines at the change, wanting another chance at his pussy but Tony is firm.

The thought is forgotten either way when he feels Tony's insides grip his relentless cock. It's a different kind of heat, but it's still Tony, still his mama gripping him tightly. He hammers in with stuttering breaths and gasps that echo in the shower stall.

Peter takes control. He pushes his omega mama against the slick shower tiles and fucks his ass with rough jerks of his hips. To his rut crazed mind, a hole is a hole and he's already dumped several loads in his omega's pussy. He could enjoy this for now...

The newly presented alpha finds he's as enamored with Tony's ass as he is with his pussy. The water washes away what they've done but It doesn't lessen Peter's urge to breed his own omega parent.

Unsurprisingly, the next attempt is shortly after.

One moment, Tony's reaching for something in the bathroom cabinet, the next, he's bent over the counter. His son grips his hips and a nice thick cock slides inside him. By now it's familiar and even though it aches, Tony grips the counter. His back arches into an enticing curve and it shakes with every harsh thrust.

All efforts at cleanliness are ruined when Peter comes inside him again. His fist is wrapped around his knot, preventing it from slipping in and at the last second, he pulls out. Warmth spurts of semen spill over Tony's ass and his lower back and even the omega feels his face grow warm at the claim.

The next two days pass in a blur.

Tony's meetings are canceled and Peter's first rut absence is accepted by his teacher.

His instincts run wild and Tony indulges him, taking the role of a mate and letting the alpha sate his urges in any of his holes.

And when the rut ends…

They're both exhausted and utilize the hot tub to soothe their sore muscles.

What occurred between them doesn't end when Peter's rut finally ebbs away. That's made clear when Tony slips into his son's lap, groaning in part pain and mostly pleasure when Peter's cock stretches him full once more.

They haven't used a condom once during the entirety of Peter's rut. It's not surprising to Tony when weeks later, a pregnancy test proves that he's carrying.

He wasn't even in heat when Peter knocked him up.

Tony takes his son out to dinner and surprises him with the news.

"Pregnant?" Peter's eyes grow wide with disbelief, "but you weren't even in heat, mama…"

Tony pecks him on the cheek.

"That's right, kid," Tony says with a proud smile, "Who knew that my Peter was such a stud? Knocking up his mama out of cycle."

He winks at the abashed alpha but there's a glow that sparks inside his son. Pride. Happiness. A mix of the two.

He touches Tony's flat tummy through the suit.

"I'm going to have a little brother or sister," Peter says in awe.

"A son or daughter," Tony adds. "It is your pup."

"It's my pup…" Peter echos, a bit dazed. "Mama…"

"Maybe you should start calling me Tony," the omega encourages but Peter's lips pucker a bit at the thought.

"You'll always be my mama though," he protests.

It makes Tony smile and he pats his son's hand.

"Aren't I your mate now too?" Tony teased, "Or are you going to leave your poor mom to do all the baby stuff?"

Of course, that brings so many protests and stuttering denials that Tony has to admit he was joking. He soothes his son and tells him, "You'll be a great daddy, Pete."

The alpha is in a daze for the rest of the dinner. There's a goofy but endearing smile on his face and he treats Tony with so much care and gentleness.

Tony makes sure to put an end to that. He's newly pregnant and his libido shoots up. There's no room for gentle, not now, and he convinces Peter of this in the car ride home.

The alpha doesn't need much convincing. Knocking up his omega mommy does things to his head, strokes his alpha ego to new heights and he wants Tony now more than ever. Wants to fuck him again, to remember just exactly how he impregnated his mommy.

Happy is the unfortunate victim as the limo driver but the partition, at least, gives them some privacy.

Tony rides Peter in the car, legs straining as he bounces up and down on that thick, wonderful alpha cock that got him pregnant. His son's cock. Peter holds him steady and one hand rests possessively over the non-existent bump.

Even if there's no physical evidence there yet, they both know there'll be a new Stark in under a year.

Peter begs Tony to let him do it again. He wants to breed his mommy after they have their first child. He doesn't want to stop putting his babies in Tony's tummy and Tony has half a mind to indulge him.

Instead, he kisses Peter oh so sweetly and teases him with a, "We'll see, baby. Maybe if you keep your grades up, hmm?"

Peter maintains a 4.0 GPA in his studies which isn't surprising given the fact that he's a Stark. The incentive was the main driving force though. He has an omega mate and his mama, all in one and while Tony still isn't allowed to touch a pan in the kitchen, he takes care of the alpha's other needs.

The omega's body starts to fill out, becoming softer and readying itself for motherhood. Tony laments at the loss of his trim and fit figure once the suits no longer fit, but every time he looks in the mirror, he's reminded.

He's carrying his son's baby. Inside his belly, there was a tiny bit of Peter and himself.

They talk about it and wonder. Would the baby be a girl or boy? Alpha? Omega? Beta? They didn't care what designation the baby came out with or what was between their legs. The baby was Peter's and Tony's and that's all that mattered.

Instead, they debate about what the baby would have from each parent. Peter's soft brown hair? Or Tony's darker thick hair? Peter's paler skin tone or Tony's Tanner complexion?

Regardless, they both already loved their little peanut.

The weeks pass and people take notice.  It's obvious to anyone with a nose, but the betas have put two and two together. They see Tony's tummy start to swell even more and  there's something soft and beautiful about Tony like this.

Peter is in love with the changes..

He worships his mama's body with kisses and words of adoration which Tony decides, makes up for the changes.

Every night and morning, he runs his hands all over every inch of his mama's body. He presses his ear to the now noticable baby bump and speaks quietly to their little Peanut.

"I did this…" Peter smiles when he caresses the  baby bump.

"Scoundrel," Tony quips, "This isn't how I raised you!" He drops the act and sighs when Peter nuzzles his chest.

His chest has changed, growing softer along with the rest of his body. It's natural and he knew it was coming. It had happened when he was pregnant with Peter.

"How big did you get when you had me?" Peter wonders as he nuzzles against Tony's soft chest.

He tweaks a nipple gently, knowing his mama's been complaining about soreness. 

"Not too big," Tony admits, "Maybe a handful? There's a couple of photoshoots I did at the time."

Peter has already seen them. His mama looked breathtaking in them. The photographers had played up the more feminine aspect of omegas, dressing Tony in ballroom gowns and long flowy pieces that showed off his modest chest. 

Simply… breathtaking.

He still likes to hear it from Tony. How big they grow is really genetics. Tony himself never grew that large when he was pregnant with Peter.

Tony massages his aching chest, pressing fingertips down lightly around the tissue. He notices Peter's watchful eyes and smiles.

"This isn't my first time," Tony reminds him, "And I've gone into milk before, even before I got pregnant."

That's something Peter hadn't been aware of.

Omegas can produce milk even outside of pregnancy, Peter knows. He just didn't know that Tony has tried it at some point.

"You did?"

"Mhmm," Tony says a bit proudly. "Takes some training but omegas can do it as long as there's someone that wants it."

The comment sticks in Peter's head… His mama making milk for… a boyfriend? An alpha friend? He takes over massaging Tony's chest and the omega lets him, melting against the bed and pillows he's propped upon.

"Would it be okay…" Peter murmurs, "if I…?"

A slow, teasing smile curls the corner of Tony's lips.

"You want a taste, little alpha?" Tony says outright.

Peter blushes but nods. "As long as it doesn't take away from peanut."

Tony waves a hand then features Peter to come closer. "Peanut will be fine. Our bodies adapt if there's a demand for more and…"

There's a twinkle in Tony's eye.

"Maybe you can help me out?" Tony purrs.

The mood shifts and Peter, after becoming intimately aware of his mama's increased libido, grows excited from the tone.

He curls up against Tony's side, one hand still massaging his chest. It goes from clinical to sensual, Peter's fingertips sweeping over sensitive skin.

"Anything, mama," Peter murmurs.

Tony turn Peter's face so he's nuzzling against the soft swell of his chest. "The more stimulation these get, the faster I'll come into milk. Help an O out, will you?"

Peter happily does so. He licks and sucks with his mouth while his hand massages the omega's chest. Tony hisses at the sensation, fingers curling into his son's soft hair.

There isn't any milk that day, but he's sure that it'll come soon.

Sex grows more difficult when Tony's belly grows but they're both determined. More often, they fuck with Tony on his side and Peter against back. It's the perfect position to let Peter touch his belly as he's fucking in and out of Tony's pussy. He still knots, still releases his come inside even though it serves no purpose for now.

Peter takes to his new task with great enthusiasm. He's always been an affection boy but now, he touches Tony freely like it's his right. Like he's Tony's alpha and mate.

His new favorite position is side to side while facing each other. He likes to suck on Tony's nipples, loves feeling Tony's swollen belly press against his body. It's the best feeling in the world and Tony can't deny that he enjoys it greatly, as well.

It's during one specific session that Peter finally gets a taste of his mama.

It's slow and gentle, Peter being more cautious the larger Tony's belly grows. He pushes in and out in a leisurely rhythm, his thick alpha cock already slick with his previous load. His stamina has grown and he's learned so, so much that he's even a bit cocky about it. He knows how to make Tony moan, how to tease the omega. Knows how to make him shiver with just a few words.

Beyond that, he knows what his mama looks like spent and fucked out. He's memorized the curve of his lips when he's gasping, learned every sensitive spot that has Tony clenching the sheets between his fingers.

He sucks in Tony's sensitive nipple, nursing like he once did when he was a small pup. There's a burst of sweetness that spills across his tongue. It surprises him so much that he pulls back, milky drops slipping from his lips.

There's a lingering sweetness in his mouth and it evokes a feeling in him. He was too young to remember nursing from his mama but it's still there, this feeling of safety and love.

Peter licks up the drops and purrs, pressing even closer to take the omega's nipple back into his mouth.

Tony groans when he feels the milk let out, eyes turned into slits while he's watching Peter lick it up. He feels the suction and it brings such sweet pleasure to him, it makes his back arch a bit. His grip tightens in Peter's hair and they continue that way.

Peter's mouth on his nipple, the milk continues to flow steadily with every suck. At the same time, Tony's pussy squeezes around his son's cock, massaging, and begging for another knot.

"Mama…" Peter groans when there's no more left. "It's so sweet… Mama's milk… I want more…"

He then switches to the other nipple, leaning up a bit to get to it.

His mouth latches onto Tony's nipple, eyes slipped closed as he focused on how sweet his Mama's milk his. He almost feels jealous that his little pup would get this for however long.

Tony drifts in a haze of pleasure but his hips hitch needily. Maybe with some training, he could come from just Peter nursing on him, but for now, he wants to get fucked.

"Baby," Tony groans, "C'mon, do it… how I like."

Peter looks up and pull off, leaving the nipple wet from his mouth and peaked in the cool air. The alpha notes the way Tony's eyes are hooded and his mouth is gasping, wanting.

"Love you, mama…" Peter tells him before he starts to hasten his thrusts.

"Love you–Oh!" Tony moans, tossing his head back. "Ah, that's perfect… Perfect…"

A glance down and Peter's eyes rest on Tony's chest, his nipples firm and puffy from the alpha's mouth. A single drop of cloudy milk drips from one nipple and Peter chases it as it slips down Tony's chest. He licks it up with his tongue, running the flat of it up so that he can take it back into his mouth.

Judging by the way the omega moans, Tony approves of it. His fingers curl in Peter's hair again as the alpha fucks him.

Tony floats on a haze of pleasure as Peter fucks him. He can feel the knot– His son has gotten good at holding it back but with his first sample of omega milk, it's like Peter has lost his inhibitions. His hips fuck forward as he sucks and sucks, greedily drinking from Tony.

The knot grows and grows, slipping inside at the very last second. Peter licks up the very last drops while his cock spurts inside his mama.

And like a good boy, he shares the sweetness with Tony, kissing him deeply.

"How was it, baby?" Tony murmurs when they're knotted.

"Mama tastes so sweet," Peter replies, nosing against his neck. "Was it good…?"

Tony kisses the top of his head.

"It was perfect, Pete," Tony tells him. "My perfect little alpha."

----

Tony has to buy new clothes.

His belly grows even larger and his chest is bigger than when he was pregnant with Peter.

"F-Fuck–!" Tony grunts while Peter fucks into him from behind.

He had been making something simple for breakfast. His instincts demanded to, feed and do all this domestic shit that Tony never cared for, so he tried pancakes. It should've been easy but Peter had come down and seeing his mama trying to cook for him had really turned him on.

Or maybe it's just an excuse to walk up behind Tony, pull his pants down, and slip right into his wet pussy.

The stove is off now and the pancake mix barely has barely cooked, but it's all ignored anyway. Peter just fucks and fucks, eager and hungry for something other than food.

He, at least has the decency to avoid knotting but then Tony's left with a steady deluge of come dripping down his thighs.

"You're gonna be late for class," Tony pokes Peter when the alpha pulls his pants up. "Late and hungry."

Peter gently turns him and nuzzles against his chest, squeezing them gently.

There's a suggestion in his eyes and Tony sighs, giving in. He leans back against the counter and Peter swoops in, tugging his Mama's shirt off before taking a nipple into his mouth.

"How did I raise such a smart ass," Tony wonders but there's a fondness in his tone.

Such encounters only become even more frequent. Peter ambushes him in the shower, in the tub… He has no shame in showing off his pregnant mama and no shame in asking Tony for milk right after school.

And it's become such a routine that Peter has Tony on his cock shortly after.

"These are you fault," Tony says when he models a new maternity bra.

They've grown a size larger and while it's still no where close to what beta women would have, they've become fairly large for an omega male.

Peter only hums, stepping up and testing the new bra to see how easy feeding would be. It's easy access and they have another round right there in the dressing room. Outsides turn a blind eye to it.

It's the Starks, after all.

Tony finally gives birth the next month. They hadn't asked for the gender, wanting it to be a surprise.

Peanut turns out to be a sweet faced little alpha girl and already, she takes after her mama. She has dark hair and an inquisitive gaze. She has Peter's mischievous nature, however.

Morgan had been hiding her alpha brother who surprised them all when he was delivered with an indignant wail. Soft brown curls and wide eyes, this one was the spitting image of Peter.

Peter had been wide eyed, staring at the two new Starks. His two pups. Their pups, his and his mama's.

"Overachiever," Tony teased him, "Not one, but two pups. What am I gonna do with you, Pete."

"Ah…" Peter chuckled, "My calc teacher told me I aced the final?"

"Of course, you did," Tony laughs, then gently hands over their youngest to Peter's arms.

He kisses Peter's cheek and whispers, "Congrats, alpha. On the exam and becoming a daddy."

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