*happy arm waving*

The premise is. Some modern omegaverse au where Volo is in present day Nimbasa but Ingo was never isekai’d. Could be a pkmn or non-pkmn au, it doesn’t really matter because it’s just about horny pregnancy shenanigans mostly.

Ingo and Emmet are both omegas. They have a pretty locked in routine regarding their heats and they have the privilege of making their own schedule for their work, so they don’t usually bother using suppressants or anything like that. Their heats are always synchronized, and theyre in tune with each other to know when it’s coming up, and eagerly help each other through them. And by that I mean they fuck each other in a lusty haze for five days straight until the worst of their heat passes.

Not exactly the most productive way to deal with it, but Ingo in particular likes an excuse to have Emmet all to himself, and Emmet goes along with anything Ingo wants, so. This is how they’ve always done things, since they first started presenting.

Volo is an alpha, and comes from a line of alphas. He’s always been a loner and kind of only inserts himself when he wants something from someone, so to say he’s comically unfamiliar with omega habits and physiology is an understatement.

He and Emmet find each other as odd as they are alluring and start hooking up casually. Ingo doesn’t particularly like or trust Volo, but he doesn’t want to be controlling over his brother, so he reluctantly turns a blind eye to their relationship. Ingo himself has a much harder time sleeping around casually and feels devoted exclusively to Emmet — he’s a little hurt that Emmet apparently finds something in Volo (and other people) that he doesn’t have, but he knows Emmet is loyal to him and tries not to worry about it too much (with varying success).

Anyway. Ingo and Emmet are going through a heat together, locking themselves up in their townhouse and spending the week sustaining on sex and whatever they can get ordered to their doorstep. Volo, perhaps having scented the start of his heat on Emmet, can’t seem to stop thinking about him and texts him asking for a hookup, but Emmet doesn’t see it (he’s probably… busy with other things (his brother)).

Volo takes it upon himself to just show up at their door, and Emmet panics a bit at the sudden intrusion, realizing he never told Volo about his heat or that he wants to spend that time Alone and especially Away from an Alpha. He goes to the door to ask him to leave, which was his fatal error, because as soon as the two of them get a whiff of each other through the crack in the door, there’s no putting that genie back in the bottle.

Emmet lets Volo inside and the two of them start going at it like they're in a horny trance and Ingo appears from the bedroom in disbelief, demanding Emmet to make him leave, which both of them ignore. Ingo ends up just watching them for a while, getting more and more dazed and blissed out as he starts masturbating to the sight of his brother getting railed. Volo is really amused by Ingo in general because he’s so verbally contrary and stubborn but tends to fold really quickly — he knows Ingo doesn’t like him but also doesn’t particularly care as long as he gets what he wants.

Anyway, at some point Volo is trying to bait Ingo into joining them since a) it’s kind of weird to just be watched the whole time, and b) Ingo smells damn good too and Volo is nothing if not a greedy self-serving bastard. Ingo tries to argue that he doesn’t put out so easily and Volo sneers, grabbing Ingo and sinking his teeth into his neck to mark him. When Ingo pushes him off, Volo smugly tells him that it shouldn’t be an issue now, right? And Ingo is furious at his audacity but unfortunately I characterize Ingo with a bit of a noncon kink so he’s also incredibly turned on.

TLDR the three of them fuck through the rest of their heat and the twins are both mortified in the aftermath. Ingo is pissed off at what Volo did (he ended up marking Emmet at one point as well), but when Emmet is clearly guilty for inadvertently allowing it to happen, he tries to temper his anger and keep it to himself, remarking how mate marks don’t have the same meaning they used to after all. It’s a different time; lots of people don't end up staying with the person who mate marked them. Emmet doesn’t seem convinced, but they both decide it’s best to drop it.

—

Skip forward a few months and things are mostly back to normal. Ingo still gets visibly pissed off whenever Volo is mentioned, but Emmet has started hooking up with him again in secret. One night after sex, Volo asks if Emmet is wearing a new cologne, and Emmet says no, asking him to elaborate. Volo says he’s smells sweet, almost sickeningly so. Emmet brushes it off, and Volo doesn’t mention it again, but Emmet notices that he’s sniffing at his hot spots that night a lot more than usual, like he’s trying to figure out what exactly it is he’s smelling.

Emmet’s in a bit of a panic when he gets back home, asking Ingo if he smells strange. Ingo rolls his eyes a bit — their scents are so entangled that it’s difficult even for them to pick each other out. But Ingo indulges him, nuzzling into his neck to get a good whiff of him, but he says he doesn’t notice anything.

Emmet allows this to ease his worries for a couple of days, until Ingo starts getting inexplicably nauseous and sick, and a test later, they’ve confirmed that they’re both pregnant.

There’s back and forth on whether to terminate or go through with the pregnancy; Ingo isn’t pleased at all that the alpha involved is Volo, but he does also concede that they had discussed wanting children and would have likely brought in an alpha for the insemination anyway. At least Volo is good looking, Ingo says, not exactly sounding happy about it.

Emmet contacts Volo about it, noting that Volo had been oddly quietly ever since the night he had pointed out Emmet’s scent. Turns out, he had been planning to skip town as soon as he’d figured it out on his own. And that simply won’t fly.

"I travel for work!" He insists. "I already told the landlord I'm not renewing my lease!" Emmet tells him he can stay with them, then, since they have a guest room. Then he can be around to help with the pregnancy! Volo tries in vain to argue himself out of it, but Emmet won't take no for an answer. Ingo isn't exactly pleased at the prospect of Volo living with them, but he'd be even more irate if Volo shirked his responsibility in all of this.

—

So begins the start of their unlikely cohabitation. Most of it is just horny pregnancy sex, in which outside of their heat the twins usually team up to overwhelm and overstimulate Volo (lol). Bro thought he was being clever, and now he's gotta deal with two incredibly blunt, incredibly needy omegas, who are demanding for him to buy things for them, who are running themselves ragged without realizing, who are trying to get him to fuck them in the middle of the fucking supermarket because their hormones are out of control. It's funny. You made this bed, Volo, now lay in it.

I am leveraging a tweet I saw a while ago that described omegas in a pack having regular phsyical "bonding" sessions with each other, involving kissing and skinship and sex, and so of course I imagine the twins do this sort of thing a lot, and Volo just kind of sits there watching like "this is really fucking weird but it's also hot so I'm not gonna say anything." Emmet and Ingo both insist this is just a normal thing omegas do, which Volo doubts, but he also comes from a line of alphas so what does he eve know about omegas anyways?

Ingo is far more susceptible to morning sickness than Emmet is, and always tries to power through it because he feels like he has to be the responsible, capable one at all times. He becomes slightly endeared to Volo when he uses his knowledge in medicinal herbs to make him a few herbal teas that settle his stomach and help him sleep.

In general, as kind of funny as it is to think about because I really do see Volo as being largely disinterested in all of this, I do think he does allow himself to be dragged along for the most part. The truth is that the twins really do need a third person there to look after them, I think. Emmet is a bit more reserved than Ingo tends to be, but I think both of them would be incredibly bad at regulating themselves and incredible bad at adjusting to the changes in their bodies and energy levels. They'll go at their regular speed and intensity and inevitably crash when their bodies can no longer keep up with it. If just one of them were pregnant, I think it would be a bit better balanced, since at least one of them would have the stamina to look after the other; with both of them pregnant, they'll be expending all their energy trying to take care of the other while neglecting themselves and they'll both suffer for it.

Volo, despite not wanting to be involved in any of this, also seems like he would at least step in to keep things from falling apart. He may resent it, he may complain about it, he may threaten to leave. But at the end of the day, these people aren't his enemy, or an obstruction to his mission - I think he would play his part out of obligation, if nothing else.

It's partly because Emmet does genuinely freak him out, but also partly because what the hell else is he going to do? As least this side quest gives him some sense of purpose, and keeps the days from getting too monotonous. I think sometimes in the quiet he sits there realizing how carried away he's gotten in all of this, how he's started letting himself believe that this is his actual life, and not just some side quest he's letting himself get swept up in to kill time.

But I also think there's times where they're all bundled up on the couch and the twins are pressed up against him on either side and he lets himself think that this really isn't so bad. The sex is good at least.

That's all I've got for now, thanks if you read all that, here's some silly bullshit I drew based on this dynamic and concept.