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The first time it happens, Peter thinks he’s dying of something normal. Allergies, maybe, or a cold he caught from sharing gum with Ned, which – okay, gross, but that’s a Tuesday problem, not a Thursday-in-May, coughing-up-something-that-is-definitely-not-mucus problem.
He’s alone in his room when it starts. Just a tickle at first, low in his chest, the kind of thing he’d normally ignore in favor of finishing his chem homework. Then it’s a full-body cough that doubles him over his desk chair, and then there’s a petal – an honest-to-God petal, red-orange and slightly crushed, sitting in his palm like it grew there.
Peter stares at it for eleven full seconds before his brain catches up to what he’s looking at.
He does what any self-respecting genius with an internet connection would do: he panics first, and Googles second.
Hanahaki disease is not, as it turns out, a real medical diagnosis in the way that strep throat is a real medical diagnosis. It’s not in any textbook Peter’s ever cracked open, not in the SI medical database he definitely doesn’t have unauthorized access to (he does), not in anything peer-reviewed. It’s the kind of thing that exists at the edges of things, murky and half-documented, the sort of ailment that shows up in a world with super-soldiers and gods and a guy who shoots lasers out of his hands – the kind of thing that only makes sense once you’ve already accepted the world doesn’t run on normal rules anymore.
Unrequited love, the first site says. The body attempts to expel the feelings that will never be returned, and flowers grow instead of scar tissue. Cute. Poetic. Deeply, deeply unhelpful, because Peter is sixteen and dating Michelle Jones, who makes him feel like he’s being perceived by a hawk in the best possible way, and he loves her, and she loves him back, loud and dry and completely certain, and that is not supposed to be how this works.
He checks the flower against a plant ID app with shaking hands. Dahlia, it tells him. Cactus variety, red-orange, sometimes called ‘firepot’.
Peter has never planted a dahlia in his life.
Maybe it’s a fluke. He thinks. Maybe this isn’t even real, maybe I inhaled something weird in chem lab. He thinks, mostly, I am not telling anyone about this until I understand it, because that has always been Peter Parker’s specialty – holding a thing tight to his chest until it either resolves itself or actively kills him, whichever comes first.
He does not consider, not yet, that it might be about Tony.
Why would he? He loves MJ. He has Ned, who is basically a brother in every way that counts. His life, for the first time in longer than he can remember, is full – full of people who show up for him, full of a version of Peter Parker who gets to be happy instead of just surviving being Peter Parker. There is no unrequited anything. There’s no gap-shaped hole where love should be landing and isn’t.
Except.
Except there’s a very specific, very small ache that lives somewhere under his sternum whenever Tony calls him ‘kid’ instead of ‘Parker’. There’s the way Peter’s chest does something complicated and warm and a little bit painful every time Tony fusses over him after patrol – pressing an ice pack into his hands without being asked, muttering about the suit’s shock absorption like it’s a personal failing, checking Peter’s pupils with a penlight he keeps in his lab coat pocket for exactly this purpose. There’s the fact that Peter has, on more than one occasion, caught himself thinking dad in the split second before he catches the thought and shoves it back down where it belongs.
He doesn’t let himself finish that thought. He goes to bed instead, dahlia petal folded into a tissue and shoved to the bottom of his backpack like evidence of a crime.
Three weeks later, it’s worse.
Not dramatically worse – nothing that would send him to a hospital, nothing that would make May notice over the dinner table, not yet – but worse in the way a low fever is worse than being healthy. He’s coughing petals almost every day now, something two or three at a time, and once, memorably, an entire small bloom that took him fifteen minutes hunched over his bathroom sink to work loose. His chest aches constantly, a dull tightness like he’s been punched and the bruise won’t fade. He’s started keeping cough drops in every pocket he owns, not because they help – they don’t, not even a little – but because the ritual of it makes him feel less like he’s coming apart at the seams in secret.
MJ notices first, because MJ notices everything, because MJ has made a hobby out of watching people closely enough to catch the things they think they’re hiding.
“You’ve been coughing for three weeks,” she says, flat, over lunch. Ned looks up from his sandwich with the particular alarm of someone who has just realized he missed something important.
“It’s allergies,” Peter says, which is the lie he’s been rehearsing.
“You’re enhanced,” MJ says. “Spider-healing. Bulletproof-ish skin. You don’t get allergies that last three weeks, Peter.”
“Maybe spider-allergies work differently.”
“Peter.” Ned sets his sandwich down, which is how Peter knows this is serious – Ned does not interrupt lunch for anything less than a genuine crisis. “Dude. You’ve lost weight. You look like you haven’t slept. What is actually going on?”
And here is the thing about having two people who know you that well: you can lie to them, technically, structurally, with words that are not false. But you cannot actually get away with it. Peter opens his mouth to deflect again and what comes out instead, involuntarily, horrifyingly, is a cough – sharp, and wet, and it doesn’t stop after one, it keeps going, and by the time it’s over there’s a crumpled dahlia petal sitting on the cafeteria table between the three of them like an accusation.
Silence. The kind that has a texture to it.
“Oh my God,” Ned says.
MJ picks up the petal with two careful fingers, turning it over, and something in her face goes very still and very serious. “Peter. Is this what I think it is.”
There’s no point lying anymore. Peter tells them – haltingly, in the smallest voice he can manage, glancing around to make sure nobody’s listening – about the coughing, about the googling, about the diagnosis with no clean edges to it. He does not tell them who. Partly because he genuinely doesn't know, or rather, doesn’t let himself know. Partly because saying it out loud would make it real in a way he isn’t ready for.
“It’s not MJ,” he adds quickly, because Ned’s eyes have gone wide and panicked in a way that suggests he’s doing math about their friend group. “I love MJ. She loves me. That’s not- it doesn't fit. And it’s not you, before you ask, because platonic love apparently doesn’t usually-” He stops. Frowns. Something cold moves through him. “Wait.”
“Wait what?” MJ says.
“It doesn’t usually do that,” Peter says slowly. “I read- there was this one forum post, way down, like page six of my search result, from someone who said hanahaki isn’t only romantic. That it can happen with any kind of love that isn’t being- met. Reciprocated. Acknowledged. Whatever.” He looks down at the petal MJ is still holding, at its ridiculous, specific color, and feels something in his stomach drop through the floor.
“Peter,” MJ says, very carefully, in the tone of someone approaching a spooked animal. “What flower is that?”
“Dahlia,” Peter says. “Firepot dahlia. I looked it up.”
“Do you know anyone with a thing for dahlias?”
Peter thinks about a night four months ago, late in the workshop, Tony half-asleep on a stool with a mug of coffee gone cold beside him, mumbling something about his mother’s garden – dahlias, everywhere, drove my old man up the wall, he wanted roses because roses look expensive – and how Peter had filed it away without thinking, the way you file away anything a person you care about tells you about themselves, a small unremarkable fact that turned out, apparently, to be a landmine.
“Oh,” Peter says. “Oh, no.”
Tony Stark does not, as a rule, let himself want things he isn’t allowed to have.
It’s a discipline he picked up somewhere in his forties, after enough therapy and enough almost-dying and enough watching people he loved get hurt because he loved them, that he stopped being able to tell the difference between wanting and risking. So when Peter Parker showed up in his life – fifteen, terrified, brilliant, achingly earnest in a way that made something in Tony’s chest do things he didn’t have a category for – Tony did the responsible thing. He mentored the kid. He built him a suit, then a better suit, then argued with him about curfews and grades and the ethics of vigilantism like a man discharging an obligation.
He did not let himself think the word son.
He thought it, obviously. Thinking a thing and letting yourself think it are different exercises. He thought it the first time Peter showed up at the compound with a black eye from a bully at school and Tony had to physically leave the room so he didn't say something he couldn't take back about finding the kid’s address. He thought it every single time Peter got hurt on patrol and something in Tony's ribs went white-hot and animal with fear that had no business belonging to an employer, a mentor, a colleague. He thought it constantly, actually, in the small unguarded seconds of every day – watching Peter geek out over a new alloy, watching Peter fall asleep on the lab couch mid-sentence, watching Peter’s face do that specific unguarded thing it does when he thinks no one’s looking, hope and hunger and disbelief all tangled together, like he still can’t quite believe he’s allowed to be here.
But thinking it and claiming it – those are different exercises too, and claiming it is the one Tony will not let himself do.
Because here is the thing Tony Stark knows about himself, the thing he’s spent an obscene amount of money on therapists trying and mostly failing to argue himself out of: he had a father. Howard Stark loved him, probably, in the specific damaged way Howard Stark was capable of loving anything, and it took Tony until he was nearly fifty and staring at old film reels to understand that his father’s love had also been the single most formative injury of his life. Tony grew up in the blast radius of a great man’s expectations and came out the other side genuinely unsure whether he knows how to love a child without also, somehow, wrecking him.
May Parker gave Peter to no one. She’s raising him. She and Ben – God rest him – were the ones who taught this kid to be soft in a hard world, to apologize first and mean it, to still believe, after everything, that people are worth saving. Tony didn’t do that. Tony met the finished product and got to enjoy the privilege of it, without any of the years of actual parenting that built it. What right does he have to walk in at the eleventh hour and try to claim the title? What right does he have to risk being one more person who lets this kid down, the way his own father let him down, the way – if Tony’s honest, brutally honest, three-in-the-morning honest – he’s let down almost everyone who’s ever loved him?
So he doesn’t say it. He keeps it in the same locked drawer where he keeps most things that scare him, and he tells himself the ache in his chest whenever Peter calls him ‘Mr. Stark’ instead of anything warmer is just – fondness. Professional affection. Nothing more, because nothing more is allowed.
He does not, notably, ask himself what it costs to keep that drawer locked. He will find out later. It will cost more than he expects.
It gets bad – really bad – over the following two weeks, and Peter gets frighteningly good at hiding it.
He learns the tricks fast: chewing mint gum to mask the faint green smell that seems to cling to him now, keeping a hoodie on even in warm weather so nobody sees how much weight he’s lost, timing his bathroom trips at the compound for when Tony’s deep in a diagnostic and won’t notice him gone twenty minutes instead of five. He gets good at swallowing coughs down into something that sounds like clearing his throat. He gets good, terrifyingly good, at smiling like everything’s fine.
MJ and Ned are not fooled for one single second, and they have both, independently and then together, made it their mission to fix this.
“You have to tell someone,” MJ says, for what might be the fortieth time, cornering him at his locker after school. “An adult. A doctor. Maybe Natasha. Anyone.”
“And say what?” Peter’s voice cracks a little, which undercuts the defiance he’s going for. “Hey, Nat, so, this is awkward, but I think I’m in love with Mr. Stark, except not like that, like a dad thing, and my body’s trying to kill me over it? She’ll think I’ve lost it.”
“She won’t,” Ned says, with the specific confidence of a guy who has watched a lot of superhero footage and developed strong opinions about the Avenger’s individual capacity for empathy. “She’s, like, weirdly good at the feelings stuff for someone who used to be a spy. And Banner basically has a PhD in the human body doing insane things because of trauma. Either of them would help. You don’t even have to tell Mr. Stark first if that's what’s freaking you out.”
“It’s not just-” Peter stops. Presses the heel of his hand against his sternum, where the ache has become a near-permanent resident. “It’s not just that I’m scared to say it. It’s that saying it makes it true. Right now it’s this thing happening to me. If I tell him, or tell anyone, it becomes this thing I feel, on purpose, out loud, and I don’t- Ned, he doesn’t want that from me. He’s made that really clear. Every time I get close to- I don’t know, saying something real, he changes the subject or makes a joke or suddenly has somewhere to be. He doesn’t want to be my-” Peter can’t even say the word. His throat does something ominous, and he swallows hard against it. “He doesn't want that. And I don’t want to make him feel obligated to something he doesn’t want.”
MJ’s face does something complicated – sympathy fighting with the specific fury she reserves for people making Peter’s life harder, even unintentionally. “Peter. You are coughing up flowers. This isn’t a ‘maybe it’ll pass’ situation. This is a ‘you could actually die situation. I looked it up too, after the cafeteria thing. Advanced cases – it does kill people, when nobody intervenes. It’s not a metaphor. It’s not poetic. It’s your lungs literally filling up with plant matter.”
“I know,” Peter whispers.
“So tell someone. Please. If not him – someone who can help.”
Peter doesn’t answer. He doesn’t say yes, and he doesn’t say no, and that non-answer sits between the three of them like its own small, thorny thing, all the way until the bell rings for next period.
He tells himself he’ll do it soon. He tells himself that a lot, actually, in the days that follow – soon, soon, once I figure out how to say it without it sounding insane – right up until the point where ‘soon’ runs out of road entirely, in a the workshop, on a Thursday, with Tony three feet away and no warning at all.
They’re working on the new web-shooter cartridge design, the two of them hunched over the same workbench the way they have a hundred times before, Tony narrating a critique of Peter’s chemical formula with the specific irritating affection he reserves only for Peter’s mistakes – “you’ve basically reinvented rubber cement, kid, I need this to hold under shear stress, not just be sticky” – when Peter’s chest does the thing it’s been doing for weeks, the tightening, the itch climbing up the back of his throat.
He’s gotten good at swallowing it down. He tries to now – clears his throat, takes a breath, reaches for the water bottle at his elbow like that’ll help – but this time it doesn’t listen. This time it comes on fast and vicious, a cough that rips out of him so hard he doubles over the workbench, and it doesn’t stop after one, or two, it just keeps going, and somewhere in the middle of it Peter realized with genuine, animal terror that he cannot breathe.
There’s something lodged in his throat. Not a petal. A stem, maybe, or a half-formed bud, something with actual substance to it, and his airway is closing around it and he claws at his own throat and manages one thin, whistling gasp before Tony’s hands are on him.
“Peter- hey, hey, look at me, what’s- Peter.” Tony’s voice goes from irritated to razor-focused in under a second, the tone he uses in a crisis, the one that used to make Peter feel steady even in the middle of a building collapse. Right now it does nothing to slow the roaring in his ears. “Talk to me, kid, what’s happening-”
Peter can’t talk. Peter can barely stand. His vision is starting to gray at the edges, spots crowding in, and the last coherent thought he has before instinct fully takes over is he’s going to see, he’s going to know, I’m sorry-
And then he coughs, one final, violent, full-body heave, and something tears loose from his throat and lands wet and red-orange on the workshop floor between them, and air rushes back into his lungs all at once, and the world stops swimming just long enough for Peter to see Tony’s face go the color of ash.
It’s not a petal. It’s a whole flower, stem and all – a dahlia, firepot-red, crushed and slick with blood – and Tony is staring at it on the floor like it’s a bomb that hasn’t gone off yet.
“FRIDAY, med bay, now, now-” Tony doesn’t finish the sentence, doesn’t need to, already has an arm braced under Peter’s shoulders and is half-carrying, half-dragging him toward the elevator with a strength Peter didn’t know skinny genius billionaires possessed. Peter’s legs aren’t cooperating. His vision keeps sliding sideways. He’s dimly aware of Tony’s voice, tight and clipped and terrified in a way Peter has genuinely never heard before, snapping instructions at the AI, at the empty air, at nothing – “vitals, get me his vitals, is he- Peter, stay with me, kid, stay awake, look at me-”
The last thing Peter registers clearly before the medbay doors and the too-bright lights and the sting of an IV going in, is Tony’s hand, gripping his own, shaking.
Peter wakes up in a medbay bed with an oxygen cannula looped under his nose, a monitor beeping somewhere to his left, and Tony Stark sitting in the chair beside him looking like he hasn’t slept in a decade.
“Hey,” Peter croaks. His throat feels raw, scraped-out, like he swallowed sandpaper. “How long-”
“Six hours,” Tony says. His voice is rough in a way Peter’s never heard from him. “You’ve been out six hours. Bruce ran every test in the book. Kid, you almost-” He stops. Rubs both hands over his face like he’s trying to physically hold himself together. “You almost died on my workshop floor and you didn’t say a word.”
Peter looks away, out the window, at nothing. Shame settles over him like a wet blanket. “I didn’t know how to tell you.”
“Tell me what, exactly. Because Bruce ran a full workup and what he found doesn’t have a name in any medical journal on Earth, Peter, it’s- flowers. He found flower matter growing in your bronchi. He said the only precedent he could find for this, and I want you to know how insane this sentence is going to sound coming out of my mouth, is a folk condition called hanahaki, which apparently the enhances community has quietly known about for years and never bothered to tell the rest of us, and it’s-” Tony’s voice cracks, just slightly, right down the middle. “It’s caused by love that isn’t being returned. That’s what he said. That’s the trigger.”
Peter says nothing. He doesn’t have to. Tony’s already looking at the dried, crushed dahlia petal that Bruce apparently bagged as evidence and left on the bedside table, the same variety, the same color, that’s been showing up in Peter’s hands for two months.
“Those are dahlias,” Tony says, very quietly, like the words cost him something to produce. “Firepot dahlias. My mother grew them. I don’t think I’ve told more than four people that in my whole life.” He looks up, and his eyes are wet, and wrecked, and horrified all at once. “Peter. Kid. Please tell me I’m wrong.”
Peter’s own eyes are stinging now, and his chest hurts, not from the flowers this time but from something rawer underneath them. “You’re not wrong,” he whispers.
Tony makes a sound like he’s been hit. He puts his head in his hands, elbows braced on his knees, and for a long, terrible moment he doesn’t say anything at all, just breathes, hard and uneven, like he’s fighting something down.
“This is my fault,” he says finally, muffled through his fingers.
“Tony-”
“No, let me- let me say this, because I’ve had six hours to think about it and if I don’t say it now I don’t think I ever will.” He lifts his head. His face is a mess, and Tony Stark does not let people see his face be a mess, and the fact that he’s letting Peter see it now means more than Peter has words for yet. “I’ve known. Some- some stupid, cowardly part of me has known for months that you’re not just my intern, or my protege, or whatever professional word I’ve been hiding behind. You’re-” He stops. Swallows. Forces it out. “You’re my kid, Peter. You have been for a long time. And I never said it. I never let myself say it, because I convinced myself I didn’t have the right – because I’m not your father, because Ben was your father in every way that matters, because I’ve got Howard Stark’s blueprint running somewhere under my ribs and I am terrified, genuinely, cellularly terrified, of being that to somebody and getting it wrong. So I kept it locked up. I told myself it was respect. Respect for Ben, for May, for you, for the family you already have that I have no business trying to elbow my way into.” His voice breaks fully now, no hiding it. “And instead I just about let you die of it. That’s not respect, Peter. That’s cowardice with better PR.”
Peter’s crying now too, quiet and painful, careful of his throat. “You’re not- Tony, you’re not trying to replace anybody. I never wanted you to replace anybody.”
“I know that now, because I’m looking at flower matter that came out of your lungs-”
“No, listen.” Peter pushes himself more upright, ignoring the way it pulls at his chest, because this feels important enough to sit up for. “Ben was my uncle. He raised me, he loved me, he died for basically being a good person on the worst night possible, and nobody is ever going to take his place, because there’s not a place- he’s not a slot I need filled, he’s just- he’s just Ben. And my parents, I barely remember them. I was a little kid. They’re photographs and a couple of stories May tells me, not a hole shaped like anything specific I can name.”
He wipes at his face with the back of his hand, wincing at the pull of the IV line.
“But you're not trying to be any of them. You're not a replacement for anything. You’re just- you. You’re the person who builds me suits and yells at me for bad chemistry and shows up at two in the morning because FRIDAY flagged my heart rate as weird during patrol, even when you’ve got a board meeting at seven. You’re the person who taught me it’s okay to be scared and keep going anyway. That’s not Ben’s job. That’s not some dead parent's job I’m trying to force you into. That’s just- that’s your job. The one you already do. I just.” His voice drops to almost nothing. “I just wanted to be allowed to call it what it is.”
Tony is silent for a long moment, and when he finally speaks, his voice has gone very soft, very careful, like he’s handling something breakable. “And what is it?”
Peter looks at him – really looks, at the exhaustion carved into his face, the fear still sitting behind his eyes, six hours of a man refusing to leave a hospital chair – and says the word he's been swallowing back down for two months, the one that grew flowers instead of coming out.
“Dad,” Peter says. “You’re my dad. Not instead of anyone. Just- also. In addition. However that math works.”
Something in Tony’s face just – breaks open. Not the wrecked kind of breaking; the other kind, the kind that comes after you’ve been holding something too tightly for too long and finally, finally set it down. He reaches out and pulls Peter into a hug, careful of the IV, careful of the cannula, one hand cradling the back of Peter’s head like he’s afraid Peter might disappear if he lets go.
“Okay,” Tony says, into Peter’s hair, voice thick. “Okay. Yeah. I can do that math. I can absolutely do that math.” A wet, disbelieving laugh. “God, kid. I’ve been so scared of getting this wrong that I nearly let it kill you by doing nothing at all. That’s- I need you to know that’s not a mistake I'm going to make twice.”
“You didn’t get it wrong,” Peter mumbles into his shoulder. “You just got it quiet. There’s a difference.”
“There really isn’t, from where I was sitting six hours ago.” But Tony’s arms tighten anyway, solid and real, and Peter lets himself sink into it, lets himself finally, finally stop bracing for the moment this gets taken away.
They stay like that for a long time – long enough that Bruce pokes his head in once, takes one look, and quietly backs back out again, muttering something about rechecking the bloodwork that is clearly just an excuse to give them the room.
The recovery isn’t instant – Bruce is very clear about that, hovering with his tablet and an expression of profound scientific fascination undercut by real relief. The flowers don’t vanish the moment the words get said; there’s a process to it, the same way there was a process to them growing in the first place. But within two days, the coughing eases. Within a week, the ache in Peter’s chest – the one he’d stopped even registering as separate from just existing – is gone, replaced by something that feels almost unfamiliar in its absence: quiet. Steady. Whole.
MJ visits on day three, takes one look at Peter sitting up in the medbay bed looking marginally less like a ghost, and says, “So you told him,” with the specific satisfaction of someone who has been right about something for weeks.
“I didn’t have a lot of choice,” Peter admits. “Nearly-dying has a way of forcing the issue.”
“I’m glad you’re not dead,” MJ says, which from her is the equivalent of a tearful, hours-long confession of love, and then she sits on the edge of his bed and doesn’t leave for three hours, and neither does Ned, who brings enough snacks to stage a small siege and insists on narrating, in loving and unnecessary detail, exactly how he’d planned to stage an intervention if Peter hadn’t come clean within the week.
Natasha stops by too, at some point during the recovery, and doesn’t say much – just sits with him for a while, tells him, dry and matter-of-fact, that she’d had her own version of this particular lesson, more than once, and that the people worth loving are rarely the ones who make it easy to say so. “Doesn’t make it less true, though,” she says. “Just means you have to say it anyway. Good on you, паучок. Or- good on the almost-dying, I guess. Effective, if inelegant.”
“Thanks, мама-паучиха,” Peter says, and she almost smiles.
Tony doesn’t leave the compound for the better part of that week, cancels two board meetings without explanation, and spends more hours than strictly necessary sitting in the medbay chair doing absolutely nothing productive except being present, like he’s making up, in bulk, for months of careful distance. On the fourth day he shows up with a small potted plant, unmistakably dahlias, the same firepot red, and sets it on the windowsill without a word.
“Figured,” he says, when Peter raises an eyebrow at it, “if they’re gonna be a whole thing now, we might as well have some that don’t come out of your lungs.”
“That’s either the sweetest or the most unhinged thing you’ve ever done,” Peter tells him.
“Welcome to having me as a dad, kid,” Tony says, and it comes out easy, unguarded, like a door that’s finally been allowed to swing all the way open. “Get used to unhinged. It’s kind of the whole package.”
Peter laughs – really laughs, full and unguarded, the kind that doesn’t catch or ache anywhere on the way out – and thinks, watching the afternoon light hit the dahlias on the windowsill, that for the first time in two months, breathing doesn’t hurt at all.