Work Text:
Peter wiggles his knees as the elevator rises, a wide grin on his face. He’d finished his exams and decided to come home early for the summer and surprise his mom. Tony had been busy lately, almost impossible to get a hold of him, and Peter missed him like crazy. Leaving his single Omega mom behind as an Alpha to go to college was hard, and Peter was always worried about him, especially as he got older. Now Peter was twenty-two, almost done with his master’s degree, and had spent several nights googling if it was normal for him to be so worried and protective over his mother. The results were inconclusive, but he hoped being home for a couple of months would help.
The doors ding open into the penthouse, and Peter steps in with a grin. “Mom! I’m home!” he calls. “Surprise!”
Tony is sitting on the couch, wrapped in his favorite silk robe, and to Peter’s dismay, looking a little pale. He’s got some weird machine thing next to him, with tubes that lead inside the robe. “Pete!” he exclaims with surprise. “Uhh, you caught me at a bad time, pup. Just give me a second–”
“Mama? What’s wrong? Are you sick?” he asks frantically, rolling his suitcase to the side and dropping his backpack on top of it. “What is that–”
“I’m okay, don’t get your knot in a twist,” he huffs out, laughing a little. He reaches inside his robe, pulling out some weird cup-looking things, attached to bottles full of white liquid. “Mama’s just getting older. Omega problems.”
A little spinning wheel appears in Peter’s brain as he tries to process what he’s seeing. “Are you lactating?”
Tony snorts. “Don’t sound so bewildered, it’s rude,” he chides. “And yes, I am. I was gonna tell you all about this when you got home, but– well, you’re here now.”
His heart lurches. “What– what’s wrong?”
“Nothing’s wrong,” he assures him. “I’m just in perimenopause, pup, and it’s causing a bit of havoc that’s all.”
“Oh,” he blinks. Perimenopause for Omegas was different from Beta and even Alpha women. Their bodies gave one last push to be as fertile as possible, releasing extra eggs, increased heat frequency, sweeter scent, just to name a few. The biological goal was to entice an Alpha into getting them pregnant again, prolonging actual menopause for a few more years. “You’re old enough for that?”
“Well, it’s a little early,” he sighs, tightening his robe around his chest before standing up from the couch. “Dr. Cho says it’s because I had you so young, and not much action since. Now that you’re out of the nest, my hindbrain is confused why I don’t have more pups around and if we’re done or not.”
Peter lets out a long breath as Tony comes over. He smiles as his mom wraps him up in a big hug, and he happily tucks his nose against his neck, breathing in the scent of citrus and rain he missed so much. His stomach clenches when he wraps his arms around Tony, and he feels softer. He doesn’t want to tell his mom that he gained weight, but his hips definitely didn’t used to be this squishy. “How long has this been going on?”
“A few months.”
“What?!” Peter yelps, pulling back to look at him. It’s still so weird to look down at his mom, but he’d had his last growth spurt this year. “Mama, why didn’t you tell me?”
“For this reason,” he laughs, poking his chest. “I didn’t want you getting all worked up about it. I’m fine, bambino, I promise. Even better now that you’re home.”
Peter’s inside melts into a happy, gooey puddle, and he hugs him again. “I’m glad I’m home, too,” he murmurs. “I missed you.”
“I missed you too, tesoro,” he hums, holding Peter by the back of the head and scratching at his scalp. “Come on. Let’s order pizza, and you can tell me how exams went.”
“Do you need to finish–”
“Nah, I’m alright,” he chuckles, kissing Peter’s cheek before pulling away. “Mama can take care of himself, thank you very much. You don’t have to worry about a thing.”
★
Peter does have to worry about one thing.
The scent.
Peter had always loved his mom’s scent. He couldn’t sleep when he was little without one of Tony’s shirts, and that had turned into sneaking one into his bed when he had his teenage ruts. The worst part of being at college was not having access to his mom’s scent, and Tony had finally found a custom candle company that replicated scents so Peter could have something to help him survive. But now? Now it’s just addicting.
He feels like he’s going crazy, even though he’s aware that Tony’s scent is doing exactly what it’s designed to do at this stage of life. He just smells so fertile. Like the freshest, most perfect orange, ripe off the tree. Peter’s cock has been permanently half-hard since he got home, and he feels so guilty about it.
It’s not helped by any of Tony’s other symptoms, either. His mom had always been body positive, so he wasn’t shy about pumping in front of Peter once he wasn’t absolutely shocked by the fact that the Omega was lactating again, usually in his robe or with a blanket covering his chest. Tony had done the traditional thing of breastfeeding Peter until he was about five, and Peter can still remember how it felt to be curled up in his mom’s lap, suckling at his breast. Sometimes he finds himself staring at Tony’s chest, trying to remember what it tasted like, wishing he could taste it again.
Tony must be able to tell.
“You want a sip?” he finally asks Peter about a week, holding up the bottle of freshly pumped milk.
“Uh–”
“Here,” he laughs, handing it over. “Get it out of your system. Try it.”
Peter inhales nervously, but brings it up to his lips. He takes a sip, and it’s like drinking a melted orange creamsicle, but not as sweet. It’s so good, and he takes another drink. “Damn, that’s good,” he blurts out, and Tony laughs.
“I can start putting it in the fridge for you,” he chuckles. “Better than it going to waste.”
“Really?” he asks. “That’s not weird?”
Tony shrugs. “Not the first time I’ve fed you with it.”
Peter takes another sip, trying to ignore his cock hardening and his stomach swooping. “Why are you lactating anyway? I didn’t know that was a thing.”
“It’s not common,” Tony sighs. “And my own fault. I was having a lot of soreness, so I started doing these massages that were supposed to help reduce the inflammation of my ducts, and well, they worked, but a little too well. My tits don’t hurt anymore, though, as long as I pump enough, so I haven’t tried to stop. Cho says it’s fine. Not worth worrying about stopping until I’ve been in this stage for about a year.”
“Well then,” he grins. “Guess I’ll enjoy it while I can.”
So now, not only is Peter reeking of fertile Omega all the time, but he’s constantly drinking breast milk. To his mortification, he’s even had a couple of wet dreams about sucking Tony’s tits while the Omega jerks him off. He tries not to be ashamed of it.
When he started rutting, Tony had sat him down and explained that as the Alpha child of a single Omega parent, his brain might get confused sometimes. Biologically, Peter would want to protect and claim his mom, especially in the absence of other potential suitors. Tony promised that he would never shame or judge Peter for it, if it ever happened, and he needed to talk about it, but Peter felt embarrassed anyway and never did. He’s always suffered his urges in silence, and that’s not stopping now, or so he thinks.
Then the first heat hits.
Jarvis alerts him one morning, asking to bring Tony’s pump to his bedroom as he forgot it in the living room the night before. Peter is happy too, but when he knocks on the door, Tony calls– “Just leave it out there, honey! I’ll get it in a second!”
Tony’s voice is shaky, and it has Peter on high alert. “Mama? Are you okay?”
“I’m fine,” he croaks. “Just, uh, maybe you should get out for the day! Go shopping or see your friends or something.”
“Why?”
“Pete, oh my god, kid–” he groans. “I’m having a pseudo-heat.”
Peter’s heart falls out of his ass, and he gulps. “Oh. Uh– okay. Are you– do you need– I can scent something for you if you need. Or snacks? Or–”
There’s a long pause, and Peter can barely hear Tony mutter something to himself before calling louder. “I’d steal a shirt,” he admits, sounding shy about it. “I keep snacks in here now, so I’m good.”
“Okay!” he gulps, pulling the t-shirt off that he slept in. “I’m leaving it out here for you. Uhm, I’ll just uh– I’m gonna go work in the lab. Call me if you need me.”
“Thanks, sweetheart.”
Peter retreats to his room to get a new shirt, ignoring the way his cock is throbbing. Down the hall, he can hear Tony opening his bedroom door to get his things. When he exits his bedroom, the scent of heat is thick in the hall, and it makes his mouth water. He forces himself to get out of there, heading down to the lab before he can do something stupid.
He manages to get himself lost in a project that isn’t dangerous if his mind wanders; his forced concentration actually turns to real focus. He’s not sure how long it’s been, but it's been at least a few hours when Jarvis makes his pinging intercom noise, and Tony’s voice echoes out of the speakers. “Pete? Do you think you could help your mother out?”
“Yeah! Of course,” he says quickly. “Are you okay?”
“Um– it’s complicated. I mean, yes, I am, but– these are only supposed to last a few hours and be mild. That’s not happening this time, so I called Cho. She said since you’re in the house, my body wants more pheremones, so she suggested– she said maybe if we watched a movie or something together, it might help it calm down.”
Peter sucks in a sharp breath, swallowing thickly. “Sure,” he says, his voice cracking slightly. “I’ll be right up.”
“Thanks, pup.”
Peter gives himself a silent reprimand the entire way up, stopping by his room to get tighter underwear. His mom is going through a biological change, and Peter doesn’t want to make him feel uncomfortable. He takes a deep breath before knocking on Tony’s bedroom door, pushing it open when he says to come in.
Tony sits in his nest, leaning up against the headboard, looking sweaty and pale. He’s wearing Peter’s shirt, and there are two wet spots where his nipples are. Peter can taste the scent of slick in the air, and he tries to breathe through his mouth so he gets less of it. “Hey, Mama,” he coos softly, shutting the door behind him. “You don’t look so good.”
“I’ve been better,” he admits with a soft laugh, patting the bed beside him. “Thanks, honey. I appreciate this.”
“Of course,” he says as he moves towards the bed, trying to be casual. “Like it’s a hardship to spend time with my mother.”
“Please,” he snorts. “I know I reek. I’m sorry.”
“You smell good,” Peter frowns as he gets in the nest, scooting closer and wrapping an arm around Tony’s shoulders. The Omega melts into his side, and Peter kisses the top of his head. “I’m sorry you’re havin’ a hard time, Mom.”
“Thanks, honey,” he laughs softly. He nuzzles into Peter a little bit, taking a big breath and then relaxing even further. “You smell good, pup. My baby is all grown up with a real Alpha scent.”
“Glad you like it,” he chuckles, rubbing his nose against him a little to scent him further. “Omegas at school think it's weird I smell like cinnamon.”
“Don’t know what they're missing,” Tony mumbles. “Much better than ambiguous dirt and musk. Blech.”
Peter laughs, scooting down the bed a little more to get comfy. Tony shifts with him, and his breath hitches when his mom throws a leg over his, practically lying on top of him. His hand moves naturally from his shoulders to his lower back, fingers grazing across bare skin where his shirt has ridden up. Peter can feel the swell of his breasts against his chest, and the sensation makes him dizzy, or maybe that’s the way his cock is swelling up in response to all the signals his mom is putting out subconsciously.
“You’re so strong, bambino,” Tony murmurs. “You’ve been working out. I can feel your abs.”
“Yeah, I get restless,” Peter hums, praying Tony doesn’t notice his hard-on. “Helps the hindbrain chill you, ya know?”
“Mmm, and what is your hindbrain getting so worked up about?”
You.
“Who knows?” he lies with a little laugh. The scent of slick gets thicker in the air, and his grip tightens momentarily on Tony’s back before he forces himself to relax. “Did you wanna watch something?”
“Whatever you want, pup,” he sighs, nuzzling at him a little before settling back down. “Think I’ll fall asleep with you here to settle me down.”
God, Peter would love nothing more than to settle his mother for real, but he bites back the urge. “J, put on something quiet,” he says. The TV springs to life with a rerun of one of Peter’s favorite Food Network shows, and he settles in to be used like a pillow for at least a good hour or so.
It takes a little while for Tony to fall asleep, but when Peter brings his hand up from his back to his hair, carding his fingers through it and scratching at his scalp, he finally drifts off. Peter keeps petting him, needing something to do to keep himself from going stir-crazy. The scent of desperate Omega mellows out, and he finally feels like he can breathe, though his hard-on doesn’t ebb one bit. It feels like it’s lying in wait, not wanting to flag in case Omega needs him at a moment’s notice.
Tony sleeps longer than he expected, but Peter knows it's good for him. He’s still dozing peacefully when Peter feels something wet on his shirt. He glances down, but Tony’s head prevents him from seeing what’s going on. Was he drooling on him? No, the placement was too low. It was more– oh. Fuck. Tony must’ve leaked through his shirt and right into Peter’s. It must be time for him to pump.
Warring with himself for a moment, Peter decides to wake him up. The last thing he wants is his mom getting a clot or mastitis. (He’d been doing a lot of reading about lactation and Omegan perimenopause.) He gently shifts under Tony, scratching at his scalp a little harder, getting him to stir. “Oma? Hey, you need to wake up.”
“Mmm, no,” he grumbles. Then he makes a little pained noise that has Peter’s hindbrain stressing out.
“You gotta pump,” Peter murmurs.
Tony whines at that, a proper, needy Omega whine. “Don’t wanna,” he pouts. “Is too much.”
“Too much?” Peter asks with concern, moving to rub his back to help him wake up a little more.
“Sensitive,” he mumbles. “Pump hurts when I’m in heat.”
“Oh,” he frowns. Then he gets an idea that might be stupid. “You want me to help?”
Tony lifts his head sleepily, narrowing his eyes at him. “Help how?”
Peter gulps as his cock throbs. “I could try to use my hands or– or my mouth,” he says softly. “Not like it’s the first time, right?”
His eyes widen, and then another needy whine escapes him. “You sure? It’s not– they’re really full.”
“Yeah, Mama, let me help,” he says, voice a little stronger now. His instincts are desperate to take care of his Omega. Without another word, he gently guides Tony to sit up, making sure he’s propped with pillows. He doesn’t protest or complain, and Peter knows it’s because of the heat. It makes him compliant.
Once Tony is situated, Peter pulls off his shirt in case this gets messy. He tosses it to the side, and Tony instantly snatches it, tucking it next to him, which is adorable. Peter is a little too tall to lie sideways in his lap, so he tentatively moves to lie on top of Tony. The problem with that is it presses his cock against the Omega’s thigh as he scoots down, and Tony gasps a little.
“Sorry, Mama,” he apologizes.
“Don’t be sorry, pup,” he murmurs, looking down at Peter with lidded eyes. “Never have to be sorry when you’re being so sweet to me.”
Peter sucks in a sharp breath and nods, then slides one hand under Tony’s shirt and rucks it up past his breasts. His cock pulses with arousal as his breasts are bared, looking gorgeously full and round. Milk beads off the tip, and Peter’s desire suddenly outweighs any shame about this. He wraps his mouth around one of his nipples and starts to suck, moaning as he instantly gets a mouthful of milk.
“Oh, fuck,” Tony gasps softly, thunking his head back against the headboard. His hand comes up to cup the back of Peter’s head, helping him hold it up and also pin him there. “Feels so good, honey.”
Peter rumbles at that, sucking a little harder. He doesn’t quite know what to do with his hands, but he figures it out. He ends up braced on his elbows on either side of Tony’s hips, hands lightly resting on his sides, where he can feel his soft curves. There’s so much tension at the base of his cock, he thinks he might pop a knot untouched.
As the milk flow really gets going, Tony whimpers and squirms under him, clearly stimulated by it. Peter finally has to grip him tighter, holding him still, and making him gasp. He rumbles softly with praise, and he can feel Tony getting wetter against his stomach.
“Alpha,” Tony moans needily.
Peter pulls off his breast for air, sucking it in greedily. “I’m here, Omega,” he croons, kissing his sternum as he switches sides. “Gonna take good care of you, Mama, I promise.”
“Pete– oh,” he groans as he starts to drink from the other side. “You should– we should– we–”
Peter doesn’t care about should or shouldn’t now. The heat hormones have gone to his head, and his cock and all he knows is instinct. He opens his mouth wider, using his tongue to stimulate Tony’s nipple as he sucks, making him moan and squirm more. Their combined scents grow thicker in the air, weaving together perfectly. As he drinks, Tony starts to rock his hips up against his stomach, clearly chasing an orgasm, and Peter lets him. It doesn’t take long before he’s crying out with pleasure.
“Good Omega,” Peter growls as he pulls off for air again. He mouths and kisses Tony’s sternum and the curve of his breasts, then down the little happy trail on his stomach. “So soft– perfect for me– gonna make it all better.”
“Pete, honey–” Peter interrupts his protests by surging up and kissing his mouth. Tony moans in surprise, but in the next moment, all the walls come tumbling down. Tony kisses him back, opening his mouth submissively for Peter to shove his tongue into. It’s frantic and messy, but passionate at the same time. “Alpha– please–”
“Shh, shh, here let me–” He forces himself away, pushing back on his knees so he can strip Tony out of his clothes. He goes for his pants next, and a growl escapes him when he sees Tony’s cunt. It’s flushed and dripping, and Peter is dying to be inside him. He frantically shoves down his own sweatpants and boxers in one go, fumbling a little to get them all the way off.
Tony’s jaw drops when he sees Peter’s cock, making him blush a little. He knows he’s big. He’s had a few hook-ups in college, and a couple of people took one look at his dick and noped out. “Is it okay?” he asks, suddenly shy.
“It’s perfect, bambino,” Tony says immediately, leaning back and spreading his thighs. “C’mere.”
Peter lies back on top of him eagerly, lining up the top of his cock. He tries to go slow, but it’s like a slip and slide; he’s so wet. Peter groans as his dick glides in, spreading his mom’s cunt. When was the last time he had a real dick? It feels like Peter is taking him for the first time, molding him to his cock.
“Oh. Jesus– yeah, right there–” Tony moans, head tilting back and panting with pleasure. “Fuck, you feel good, baby. Fuck me, c’mon. Make Mama feel better.”
Peter groans and starts to move his hips in slow, slippery thrusts. Tony’s body relaxes to let him in, and soon enough, he’s thrusting in and out to his full extent, the tip of his cock hitting Tony’s cervix with every thrust. It feels like heaven, and he has no idea how he’ll ever want anyone but his mom ever again.
“Cumming–” Tony chokes out suddenly, and there’s a new burst of wetness around Peter’s cock. He growls in satisfaction at making his Omega cum, and he starts to fuck him faster. “Oh fuck– knot me, Alpha, breed me, please!”
At the word breed, Peter loses it. His cock throbs, and he practically roars as everything suddenly bursts. His knot swells, locking them together milliseconds before he cums. He lets out a loud groan as his teeth throb, but he has enough wherewithal not to bite his mother. He rocks his hips as he pumps him full of seed, grinding his knot against his entrance until Tony is cumming again with a shuddering gasp.
Tony’s tits are leaking against him again, so Peter ducks his head and starts to nurse once more. The Omega moans sweetly, and nursing while locked together like this is even better than he dreamed. Peter greedily drinks as much as he can, grinding his knot while he does it until Tony is cumming again and whines in overstimulation.
“You drained me dry, pup, promise,” he pants, laughing a little. “Holy shit.”
Peter just hums in agreement, still nuzzling and kissing anywhere he can reach, smothering his mom in his scent. “Mine,” he mumbles.
“Think I put you in a rut, baby,” Tony murmurs, tilting his neck to the side. He sighs softly, not sounding that bothered. “We’ll figure it out later.”
★
“Pete!?”
“Yeah?” he calls, hurrying down the hall to Tony’s room. “Are you okay?”
“Uh– sorta?”
“What does sorta m– Oh.” Peter stops dead in his tracks when he sees Tony holding a pregnancy test. They hadn’t really talked about what happened between them yet. They’d stayed in heat and rut for another whole day before coming out of it, and while they hadn’t had sex again since, Peter had been sneaking some not-so-familial kisses. But this was– “Is it?”
“Yep,” he says, sinking down on the edge of the bed. “Positive.”
Peter sucks in a deep breath. “Is it going to be okay? The baby, I mean? Or is it better to–”
A tiny whine escapes Tony before Peter can even finish, and he hurries over to sit next to him. “I don’t know,” he whispers, leaning into Peter’s arms. “I’d have to talk to Cho. This isn’t– I mean, it’s not like it’s illegal what we did, you are an adult, but like– family heat helping hasn’t been done since the forties.”
“We don’t have to tell anyone except Cho,” he says. “We can say it’s a random Alpha.”
“With you puffing up like a peacock everywhere?” Tony laughs. “The people we love will find out. No, better to tell the truth. It was a hormone-induced fluke and–”
“Mama, it’s not a fluke,” Peter murmurs, kissing the curve of his neck. “I want you.”
“Pete–”
“I’ve always wanted you,” he whispers. “I know you want me. You don’t like other Alphas.”
“Don’t use logic against me,” he grumbles.
“I’m not hearing a no.”
“Oh my god, yes, kid, you are the only Alpha for me, of course you are,” he laughs. “But we can’t.”
“You think we won’t be able to resist again?” he asks heatedly. “Because I’m not gonna let you deal with this pregnancy alone. It’s my pup, too. You’re mine, I’m not letting you go.”
Tony smiles a little, laughing and shaking his head. “Stubborn,” he huffs, and Peter just grins. “Alright, fine, we’ll– we’ll figure it out. I’m a weak, weak man for you, tesoro.”
Peter laughs softly, coaxing him into a real kiss. “I love you, Mama,” he murmurs.
Tony smiles, pecking him again. “Love you too, baby.”