It's a long, sleepless night.
 
You don't have to look far to find Auriga and Corona, both standing guard only a few rooms away. They know their sister well, after all - well enough to respect her privacy, but keenly aware of just how close she is to foaling. Corona falls into a fit of giggles at the sight of you and Auriga raises an accusatory eyebrow, but as you explain the situation questions are hurriedly set aside for later. You're a hair's breadth from being trampled as they both rush for the door.
 
The three of you stay at Boundless' side as she labors. It isn't quick, in fact it's a matter of hours, weighed down by nervousness and worry - Auriga knows next to nothing about the process and rages impotently at her own ignorance, and Corona's knowledge is strictly theoretical. Her heart's obviously in the right place, but she seems just as interested in studying Boundless as helping her, scribbling away in a notebook at every opportunity. You're the only one even close to qualified in medicine, and you simply have no experience with assisting in labor, let alone the labor of a very large mutant mare delivering twins.
 
Nature, though, takes its course whether you understand it or not. Whatever process made Boundless into what she is couldn't take away the fundamental instincts tied to creating new life. While the three of you comfort her and keep her hydrated, her body does most of the hard work on its own. She shivers and sweats, sometimes groaning or crying out in pain, but the process is steady and consistent. In the end, all she needs are comforting words and steadying hooves. And towels - quite a few of those. You're quietly thankful that she decided to bed down in a heap of old fabric - a lot of these textiles won't be much use to anyone any more. Hopefully you didn't use up any of the valuable ones.
 
Eventually, in the light of two horns and the very first hint of morning sun from out in the corridor, a tired but supremely satisfied (not to mention relieved) Boundless cradles two newborn fillies to her side. One lavender and one navy blue, they're all gangly legs and long necks. Probably almost as tall as you, if they could stand yet. Little featherless wings and tiny cone-shaped nubs that mark the beginnings of horns. Auriga returns to her vigil outside; perhaps it's a trick of the light, but for a moment you think you catch a glimpse of her actually smiling. Is that a tear in her eye? Surely not. Corona fusses over the foals until Boundless wearily reminds her to calm down, and you, well, honestly you're just plain worn out by the whole ordeal. Eventually you simply bunk down in the corner, struggling to keep your eyes open.
 
"Sleep if you need to, hon. You've done enough," Boundless murmurs. She doesn't look straight at you; right now she only has eyes for the little ones, and there's a long pause while she indulges in a long, cavernous yawn. "I'm so glad you stayed. And... well, thank you. For everything." You give her a little smile as you settle down to rest. Hey - what are friends for?
 
---
 
Time passes relatively uneventfully for a few weeks, and this time you're looking after Boundless rather than the other way around. You shrug it off as 'just being a good healer' and 'professionalism' and all that, but you can't really deny that you've become fond of her.
 
It takes time for her to recover, and it turns out that you can continue to make yourself useful. While the alicorns have plenty of caps and relatively valuable trade goods, they have trouble getting the things they need, like medicine or portable radiation sources. Until now, Corona's acted as half scavenger, half trader for the trio. Her invisibility spell naturally helps to avoid danger or suspicious stares, but visiting a town is always a crapshoot. You can just imagine some poor scrap merchant being accosted by a giant blue mare that suddenly appears from nowhere cranking out a sentence every second and trying to buy broken spark batteries. Instead, as a normal pony you can travel and interact a little more freely. Well, a 'normal' pony. You might have mutated just a teeny tiny bit from all the radiation exposure, but it's hard to tell for certain. You try to look on the bright side either way - maybe an extra chromasome boosts charisma or something.
 
So in essence, they employ you. You spend a lot of your time travelling back and forth between the power station's admin wing and nearby settlements, fetching things that the alicorns need day to day. Food, mostly, but Corona wants more esoteric things as well. Now that they know for sure that alicorns can breed with the correct application of magic, she's eager to try and find a way to replicate the exact process that the Goddess might have used. The details fly over your head but it's something to do with tissue samples, intense conjuring, and a lot of private time. On one trip, you even stumble across a merchant peddling a few pre-war toys. They're tacky and colourful, and the grizzled-looking unicorn behind the counter raises an eyebrow when you, a grown stallion, declare straight up that you want to buy all of them. You insist they're for a friend's foals, but it doesn't look like he believes you.
 
Speaking of the foals, it turns out that Boundless has had names in mind for quite a while. You return from the latest trip to find Flourish and Gemini (the blue one and the purple one respectively) toddling around unsteadily on their gangly legs while their mother juggles her attention between them and her sewing machine. She sits up and smiles at the sight of you, and her eyes light up when she sees what you've brought. The fillies look on curiously while she gives you a great big hug. Boundless might not be lugging a swollen, foal-filled belly around any more, but she's still appreciably plumper and curvier than her sisters. Her clothes have gone from overstrained to merely snug; all the plush softness around her hips and middle make her pleasant to look at and very, very good at hugging. You're okay with this.
 
And when the foals are asleep, judging by the way she gives you a surreptitious ear nibble and whispers that she's still in the mood for belly rubs, it seems that she is too.