Posted: May 16th, 2026
Last Updated: June 08th, 2026
OP's Note: Hello everyone! And welcome to the Sun/Moon Master-post! This post is planned to keep being updated as the AU develops so, feel fee to check it whenever you'd like. I wanna thank everyone for your amazing support, you've been amazing so far and thank you for enjoying my ramblings as much as I do. I hope this helps in clearing a bit more the plot and the characters. Without much more to say, sit back and enjoy!
This is an Alternative Universe set between the plots of Project Hail Mary and Iron Lung, focusing mainly on the relationship between Ryland Grace and Simon. At it's core, it's a Canon Divergence from both movies, starting at both character's death scenes.
WARNING: THIS AU (and account) IS RATED 16+ (18+ even)FOR NUDITY AND SUGGESTIVE EROTIC CONTENT. MINORS PLEASE DON'T INTERACT.
Main Plot
Ryland Grace has failed his mission on saving Earth. But he gets ascended and given the role of the Sun God. Now he's got a second chance at fixing it all, but for that he must remember the man he once was to achieve it. In the process he'll re-encounter his little rock friend and also an intriguing stranger, but Grace isn't too sure what his true intentions might be.
A threat looms around the corner, as stars seem to be dimming and Grace doesn't know what he's supposed to do to fix this. Will he push through the pain and get the aid he needs to remember his real purpose?
[Under development]
Characters
Sun!Grace
Backstory
Formerly known as Dr. Ryland Grace, inhabited Earth until humanity discovered Astrophages threatening their sun and all known stars except Tau Ceti. As a last chance at survival, Ryland got sent on the Hail Mary mission to investigate the star, solve the Astrophage problem and save Earth from extinction. Being forced to work through his amnesia, he meets an alien who he names as Rocky, who's planet, Erid, is threatened by the Astrophage infestation as well. The two of them work out a plan to save their planets, to fish out samples from Tau Ceti-E and figure out why it's sun isn't dimming. It's during this mission that Dr. Grace meets his demise. The Hail Mary had taken too much damage, a minute too long unconscious was enough for multiple fuel tanks to get breached and the Astrophage to fly out of control towards Tau Ceti-E during their take off. The crushing force of gravity had propelled Grace into the ship's controllers, his face smashing against one of the multiple screens and almost cracking his skull open from impact in the process. He'd been too weak to move, unable to put the ship back under control. All he'd longed for, was for Earth and Erid to be safe, for his crew mate's lifes to not go to waste. All he could think about is how he'd failed everyone, as his view faded into blinding light and into unconsciousness.
Present
When Grace wakes up next, he's no longer on board a ship. He's met with the vastness of space instead and millions of stars that twinkle at him. Something deep in his gut tells him that this is wrong, that it shouldn't be possible for him to even breathe in this environment, but… was he even breathing? Was he supposed to breathe at all even? He couldn't even remember who or what he was. Maybe this was normal after all. He'd stare at what seemed to be his glowing form. Discolored fingertips, glowing marks all over his body, being dressed in golden clothing matching his longer golden hair that flowed freely on the emptiness of space… Something didn't sit right on the pit of his stomach, but hey, maybe he didn't need to question all about himself, did he?
Personality and Temperament
This version of Grace is more innocent in his ways, more outgoing, bold and open to experiences, as is the reward of not really remembering who you used to be, what your responsibilities were and what you are afraid of. He is an explorer at heart and curious by nature, he wishes to question everything and discover things great and small, even if the greatest mystery of all seems to be himself. He looks at life full of optimism, although he's got some insecurities regarding his past and who he's supposed to be. He finds himself on long sessions trying to remember but always gets stricken by horrid head aches and only able to figure out a minimal thing or two from each session, which leaves him frustrated, irritable and moody. Later on, he realizes that he actually gains the most from simply living through experiences rather than forcing himself to the process.
Moon!Simon
Backstory
Simon was born on a dimming universe. The Quiet Rapture had wreak havoc, every known planet and star dissapearing from existence within milliseconds, leaving the last humans within the cosmos to fight their way through survival. Exploration missions had been sent out, to try and find new resources to aid the cause. In the process, four blood moons had been encountered, so far.
Overall, the trials and tribulations didn't seem to be on Simon's side throughout his life. He'd been raised in a cult, betrayed by his brothers and then thrown into prison for the rest of his days. In there he'd torture himself with his own thoughts of what did he do wrong? Did he really deserve this? What could he have done for things to have gone differently? Did he ever have a say into whatever happened to his life? Because it certainly didn't feel that way. And soon this thought would be proven, as an olive branch was extended, and he was offered some sort of deal: to be the first person to explore the floor of a blood ocean in exchange of his imprisonment. He'd walk out of there with a clean record, is what the C.O.I. had promised. And since by this point he had nothing else to lose… The idea of it was just far too good to miss. And so he accepted. But what seemed to be a simple plan had soon gone to hell as he lost his mind in that ocean. The creature had spoken to him, shown him things that no human should've ever seen, and for that he payed with his sanity and his own life.
The last thing Simon remembered was the red, the blood stained everything and everywhere as it rose. The raw smell of copper and iron blinded his senses, until all he felt was pain. Raw and angry pain of a ripped arm, of broken ribs, of a dislocated knee, of bubbling blisters and skin peeling off his bones. The torture seemed to go on until blood filled his systems and turned him into nothingness, the sweet and pure relief of losing consciousness even if all he ever wanted to do was live.
Present
He'd been reborn… or something of the like. He couldn't remember how long he'd spent in the void before it reached to him. The Eye. The Unknown God. Or whatever name it went by, since it never disclosed it to him. It had seemed apologetic as it changed him, gifted him a new body and a new consciousness. In an almost motherly way, it had said that Simon was made for greater things, that whatever pain he'd gone through was worth it in the end for him to achieve his ascended form. It imposed a mission for him as an exchange for his second chance at life: to fix everything. A God born to fix the mistakes of an ignorant higher entity. Simon had denied to at first but, this seemed like the best option right now. He just hoped he wouldn't be betrayed again.
The Unknown God knew that to save the universes Simon would need help, and so, bestowed him with the gift of knowledge, all the knowledge he'd need to make amends. But even then, Simon would be incomplete. He couldn't place things back in order by himself and for that he needed his second half: A golden child who'd compliment him like no-one else, who actually had the tools and skills to work their way through the hardships. But he hadn't been born yet.
And so, Simon had been left in a decaying universe to wait for some sort of… kid?
Honestly? Simon thought it all to be utter bullshit.
So what, this asshole of a God decides to nuke his entire universe or something and expects him to fix it for him? Yeah. What a joke. But even then he waits, since he's got no other choice. He loses himself into his own thoughts for clues of who this golden guy must be and whatever the hell is he supposed to do to fix all this mess.
Centuries must've passed before the tiniest of flames ignited inside his chest. He felt an urge to find something or, someone. Maybe what he had been waiting for had finally popped into existence? And so, he answered to the pull, traveling between multiverses until he was finally able to find what he was looking for.
Personality and Temperament
Stoic, stubborn and egotistical would be the best ways to describe Simon. But you can't blame him for it really, since he had been thrown all the way to hell and back. Both being centuries old and possessing the infinite knowledge had given him enough tools to remember his past life and how he ended up as a deity, and brought him to a sort of peace with the circumstances of life. But even if he'd reached comfort within his own existence, the pain of betrayal was hard to ignore. Simon was aware of the atrocities humanity was capable of. And if it was in his power to keep pain from reaching others then he'd do so. It's a strange way to show his kindness, but it came from fondness still and his longing for peace and quiet.
Asteroid!Rocky
[Under development]
Adrian
[Under development]
The Unkown God
[Under development]
Comic (On going)
Part 1 | Part 2 | Part 3 | Part 4 | Part 5
Playlist
Original Artworks
Original Concept Art
Cuddly Sleeps
Stargazing
Giant sun!Grace
Thoughts
Simoon's skirt
Eclipse
Grace's pants (suggestive)
Possession (fanart of fanart)
Beautiful Fanart (by you guys!)
⭐ Simoon by @crackshipsandregret
Cosmic dance by @ohhelloimsotired
Simoon by @coryboringstory
Patron Saints of One Way Trips by @xxdisturbedxx
Simoon by @vioennui
⭐ Three of them by @lothechild
⭐ Size difference by @haunted-art-gallery
Size difference 2 by @haunted-art-gallery
I can fix that by @lothechild
⭐ Protected by @ohhelloimsotired
Grace by @thereal-sillyguy
Cuties! by @earlgrey-with-lemon
Babies! by @3llatricks
⭐ Reaching by @ohhelloimsotired
⭐ Connection by @zenaidazog
Trivia
For this AU, Iron Lung's universe is older, and thus, the events happen earlier than PHM.
Since Grace is a sun / the representation of a sun, he is capable of being affected by the Astrophages.
Grace often has the strange sensation that he's met Simon before, we can't pinpoint exactly why.
Simon is aware of the multiverse. (This is mostly for silly posts and not necessarily influential in canon)
The official color palettes are available on my tumblr!
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“I know you’re not.” She says gently. Colt wished he was anywhere else but here.
“But you have plenty of experience in front of a camera already, and… Colt, you’re his twin. You knew him in a way no one else ever could."
or
Colt is asked to star as legendary astronaut Ryland Grace in a biopic about him.
· · ─ ·✶· ─ · ·
Spoiler free opinion:
I read this while it was updating so every week I was excited for next part!! This fic BROKE ME. In the best way possible!! And it has turned into one of my favourites of this fandom!
Poor Colt having to go revisit all that his brother went through, and yet still not able to know all about it, it's so heartbreaking
All I'm waiting for is some sort of epilogue, hopefully, bc I'm really excited to see the aftermath of it all!!!
Previous decision: Eat breakfast! Work will be worse on an empty stomach!
Tag list: (please let me know if you would like to be tagged for the game!) @lairongy @ohhelloimsotired @avid-is-here-now
Grace nearly trips over his own shoelaces skidding down the corridors, slapping a hand against the wall to avoid slamming his shoulder into it as he rounds a corner.
He’s late, he knew he’d be late, but after weighing his options he’d ultimately decided that skipping breakfast would have far worse consequences than showing up ten minutes late to Stratt’s meeting.
They already have a bunch of meetings in the task force. It’s fine if he’s late for one, right? Right?
He’s panting as he sprints down the hall, muttering apologies to the scientists and guards he barely manages to dodge as he passes them. He glances at his watch, grimacing as another minute slips by.
He comes to an abrupt stop outside the meeting room, attempting to quickly gulp down air and straighten his sweater. It’s probably a lost cause, but he does his best to not look like he’s just probably broken a few traffic laws on his bike and then sprinted through the building.
Unfortunately, there’s no back door to the meeting room so when he walks in he knows everyone’s going to see him.
No point in delaying the inevitable
Grace takes a deep, fortifying breath that ultimately does little to settle his nerves and reaches for the door knob. The door swings open smoothly and silently… not that that does anything to keep every head in the room from turning his direction. Grace smiles weakly at the other members of the task force already in the room.
“Hi, uh, sorry, traffic was-“
“Dr. Grace,” Stratt says sharply, cutting him off. Grace immediately clams up, dipping his head apologetically as he meets her narrow-eyed glare. “Please, have a seat.”
She doesn’t even need to lecture him in front of the others for them all to sense the unspoken reprimand. Grace’s heart drops and he slinks off to the open spot next to Ilyukhina, who shoots him a sympathetic grimace as she pulls the chair out. Grace meekly nods his thanks as he slides into the chair, drops his bag, and pulls out a battered notebook and pen.
He flips to a fresh page and writes the date at the top quickly. It’s only then that he looks up at the Powerpoint slide currently on the screen.
Next Steps
There isn’t any other information on the slide, and he looks around a little helplessly. He weighs his options again, wondering if he should risk asking Ilyukhina what the topic of the meeting is, or if that would just draw more negative attention to himself. He’s just about to swallow his pride and maybe raise his hand or something when Stratt’s eyes zero in on him again.
“You actually arrived at the perfect time, Dr. Grace,” Stratt says, and Grace feels a strange sense of foreboding settle into his stomach.
“Oh, that’s… good,” he says, though the last word comes out as more of a question.
His gaze darts to Ilyukhina again, but her expression is uncharacteristically ashen. Actually, now that he’s looking around, all of the task force look stone-faced and somber, like he’s accidentally stumbled into a wake instead of work.
“What am I in time for?” Grace asks.
Warning bells are clanging in the back of his mind. When he glances at the door, he stiffens as he realizes Carl is standing by it, expression pinched. It’s almost like…
“Do you, um, need me to help with something?”
“You could say that,” Stratt says. A flicker of something passes across her face, but she quickly fixes it back into a mask of forced neutrality. “As I was saying, our mission has hit a bit of a… snag.”
Grace nods slowly. “What kind of…?”
“Dubois and Shapiro are in the hospital,” Yáo says, cutting to the chase.
“Wait, what?!” Grace’s eyes widen until they feel like they’re about to pop out of his head, “How did- what?!”
“There was an accident in one of the labs,” Stratt says, tone clipped. “They’re both stable, thankfully, but they are in no shape to recover in the time frame we’ve planned.”
“Oh fudge,” Grace blurts before he can stop himself. He can’t even bring himself to be embarrassed in the way he’d usually be. “What do we- how are we-?” His words are all trying to exit his mouth so fast they trip over themselves. “What are we going to do?!”
“That is the question,” Stratt says, motioning to the words on the screen. “I’ll be frank, we don’t have the time to train up another science officer. The launch window is in less than a week, and we don’t know if we’ll have another shot once the station passes out of range on its current orbital trajectory. This is our only window.”
She gives him a hard look, as if Grace might suddenly have some brilliant answer to the problem. Grace swallows, but his head is completely blank. He’s still reeling from trying to process both Dubois and Shapiro being out of commission.
How on earth had that happened?! What had gone wrong in the labs?! Was it something they should all be worried about as well? No, focus!
“Well,” Grace licks his suddenly dry lips, “The other candidates-“
“Aren’t far enough up to speed,” Stratt says, though not unkindly. “Flight training is easy enough for an amateur at this point. Possessing the scientific knowhow…”
There’s a heavy pause after her words. Grace realizes that everyone in the room is staring at him again. It takes a second for the penny to drop.
“Wait- you- you can’t be serious!” He stutters. His blood runs cold as he stares into Stratt’s unblinking eyes. She’d never been one to make jokes before, and he doubts she’d start now but this was… this was… “That’s ridiculous!”
“You are the only option, Dr. Grace,” she says, folding her hands in front of her. “You are familiar with our objective, and you have the skills that will be necessary to successfully complete it. You have my full confidence.”
As if that’s all that was missing
Grace laughs, though it’s more from hysteria than anything else. “I- I’m not an astronaut!” When he continues to get blank stares he says, a little louder, “I’m not an astronaut! I won’t- I don’t know how to survive in space!”
Never mind that just getting to the abandoned space station would be at least seven months one way and another seven coming back. Just the thought of leaving the ground for more than a few minutes has Grace’s guts tying themselves in knots so violently he thinks he might be sick with it. The half-digested remains of his breakfast burrito churn alarmingly in his stomach.
“It’s for less than two years,” Stratt says, as if he’d never spoken, “You will be fairly compensated for your trouble, and we have done everything in our power to ensure the safety of the mission. Really, all you’ll have to do is go out there, collect some samples, and come home.”
“You- you can’t just make me-!” Grace blusters. He pales as he realizes that Carl has shifted slightly to be standing right in front of the exit instead of next to it.
“Hey, don’t worry,” Ilyukhina says, offering Grace a tentative smile, “We’ll make sure this is as quick and painless as possible!”
“We won’t take any unnecessary risks,” Yáo agrees. “You’re in good hands.”
“And we’ll get to celebrate a bunch of holidays together, huh?” Ilyukhina sounds like she’s trying to stay upbeat, “I hear Stratt’s loaded nearly every movie and video game onto the ship already! It’ll be like a vacation!”
Grace’s mouth opens and closes a few times. “This is crazy! This is-“
Stratt lets out a long breath through her nose. “Dr. Grace. We can do this the easy way, or the hard way.”
“He’s not unwilling,” Stratt says, her eyes never leaving Grace. “He knows what’s at stake. And deep down, he’s a scientist. I’m hardly expecting you to die in space, Dr. Grace. This is a research mission, plain and simple. Now, what is your answer?”
Grace swallows dryly and feels his throat stick. He stares at the screen, the words ‘Next Steps’ burning into his retinas. He’s never done well with peer pressure, especially not when so many eyes are on him. He looks at the door again, but Carl just shakes his head slightly.
A bizarre sort of calm settles over Grace’s shoulders. He’s pretty sure he’s going to be sick in the bathroom right after this. Maybe he should have skipped breakfast after all. He lets out a shaky breath.
…
Agree to the mission (you have no choice)
Agree to the mission (you’ll be okay right?)
Agree to the mission (what’s the worst that could happen?)
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As a teen I was obsessed @elicedraws 's Destiel Sun/Moon AU (if you see this, sorry for the scare) and it's such a great inspiration for my version of BloodyMary, crazy to think how without Elice, there would've been very little possibility for these designs to exist
I'm a sentimental prick, and I gotta say I love you all for supporting this silly account and being so patient with me sbdjdjd 💜✨
Rose from the dead because of another gay ship…. Happy pride month
@lairongy fanart of this person’s amazing au!! Your art is such eye candy 🥹
I added a few more details such as the spots on Sunry’s skin representing solar flares, Simoon’s representing the moon “craters” and just overall how colorful the moon really is based on new photos!
(Also I thought it’ll be really cute if these only appear when they’re flustered or whatnot…. They both need body spots the other can admire and kiss okay)
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This preview pic is so cute just a boy and his sphere fr
Using your lovely ask to showcase some comic progress--
It's been updated!! That's his emotional support rock!
Here's more scribble Rocky
Aaand a Simoon lineart (just a peek tho)
Aaand I'm currently working on some background stuff that I'm excited about!
Irl stuff after the cut!↓
I really wanna keep drawing today buuut today it's the Pride Parade and I'm gonna attend it in my Grace costume! (Since I'll be attending a BL Expo right after-- ANFKNDK)
I made a Rocky sign for it, the text reads "Rocky says + (more) Non Binary representation"
I also made some Grace photocards for whomever recognises the costume
