1 - 20 of 112 Bookmarks by Cosmistro
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Everyone had their fair share of secrets, some more so than others.
Mydei knew this better than most. To his colleagues and to anyone else he came across daily, he was simply the solemn one. He never said anything more than what was asked of him and he never lingered long enough to befriend anyone else. No man was an island, but Mydei came close to being one.
But alone, in the solitary privacy of his own room every Thursday and Sunday night, he harbored one little secret that he would never deign to reveal to anyone else.
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or, what do you do when these secrets come to light-and are found out by the person you least wanted to know?
Series
- Part 1 of parasocial
- Language:
- English
- Words:
- 74,321
- Chapters:
- 10/10
- Comments:
- 612
- Kudos:
- 7,298
- Bookmarks:
- 1,259
- Hits:
- 147,613
Bookmarked by Cosmistro
02 Jun 2026
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Devil's Food Cake by seidrade for Sweeppeech
Fandoms: 崩坏：星穹铁道 | Honkai: Star Rail (Video Game)
28 May 2025
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Aventurine's smile is worryingly devious when he video-calls Sunday around the time he would normally be leaving work.
"Hey, little birdie. Ratio's coming over again tonight. Why don't you freshen up before we arrive, hm?"
"Is he expecting…?" Sunday trails off, knowing he doesn't need to clarify further. Aventurine has only involved Ratio in their sexual escapades once so far, but it was merely a matter of time before the other shoe dropped.
"Mm, I suppose that depends on you." Aventurine's voice lowers to a purr as he steps into an elevator. "I was just thinking to myself today, you know, it's really a shame that perfect little peach of an ass hasn't had both Ratio and myself inside it yet…"
Oh, Sunday… you've got a big storm coming.
Series
- Part 3 of Sweet Tooth
- Language:
- English
- Words:
- 7,358
- Chapters:
- 1/1
- Collections:
- 1
- Comments:
- 31
- Kudos:
- 413
- Bookmarks:
- 47
- Hits:
- 9,449
Bookmarked by Cosmistro
27 May 2026
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Sunday thought he knew how to hold himself together — until Aventurine took him apart, piece by piece.
Bookmarked by Cosmistro
16 May 2026
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Angel Food Cake by seidrade for Sweeppeech
Fandoms: 崩坏：星穹铁道 | Honkai: Star Rail (Video Game)
18 May 2025
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“Good evening, princess,” Aventurine greets, swanning upstairs into his loft bedroom without knocking.
As he expects, Sunday’s wrapped up in a plush robe (one of Aventurine’s, notably, not his own) and sitting on the bed, legs tucked up beneath him in a staged manner as he focuses on his phone. Nobody lounges in bed like that. There’s a few empty glass bottles of water on the side table, and Aventurine knows he’s already gotten rid of any evidence he’s been eating candy or other such ‘frivolous’ snacks.
Sunday’s words, not his. Aventurine fucking loves frivolity. Which probably explains why he’s so fond of the feathered little thing currently wrapped up in his blankets.
Aventurine comes home from work to find that his favorite live-in pet has been brooding and misbehaving while he was away. Luckily, he has just the thing to provide a little much-needed discipline.
Sunday's gonna hate it.
Series
- Part 1 of Sweet Tooth
- Language:
- English
- Words:
- 4,406
- Chapters:
- 1/1
- Collections:
- 1
- Comments:
- 19
- Kudos:
- 379
- Bookmarks:
- 51
- Hits:
- 7,254
Bookmarked by Cosmistro
01 May 2026
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praying to stay in your arms just until i can die a little bit longer by StrawberryMacaroon
Fandoms: 崩坏：星穹铁道 | Honkai: Star Rail (Video Game)
28 Jul 2025
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Welt couldn't believe his ears, an irritated smirk creeping up on his lips. “That's what this is about? Sunday, you know I would give you anything you asked for.” He said quickly, in a hushed voice.
Sunday simply hummed in response.
Welt scoffed and stood up, grabbing the other's wrist. If he had any objections, he didn't show them.
“Stop playing that game. Come on.”
Bookmarked by Cosmistro
01 May 2026
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Guilty Pleasure by Grimour (Omnia_Immortalis), Omnia_Immortalis
Fandoms: 崩坏：星穹铁道 | Honkai: Star Rail (Video Game)
26 Oct 2025
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Summary
“Come on in, darling.”
The door opened slowly, and Aventurine's expectant smile grew, legs spread on the sofa, donning one of his dark green suits.
Sunday's foot made it past the threshold, wrapped up in white stocking, reaching all the way up to his creamy thigh, and Aventurine's stare followed it indulgently, reaching the frilly set of pink lingerie. There was a heart cut-out by his pelvis, filled in by grey, fluffy feathers. Cute.
“Don't be shy, let daddy see you in full.”
For a moment, Sunday bristled, tinted lips pressed together, brows furled – though his cheeks grew red. He obliged, not without muttering: “This is ridiculous.”
Aventurine laughed. "And yet, you're hard.”
Kinktober Day 26: Lingerie
Series
- Part 7 of Grim's Kinktober Fics
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whatever happens in the office, stays in the office by hackermoth for lilyveil1399 (clairespring7840)
Fandoms: 崩坏：星穹铁道 | Honkai: Star Rail (Video Game)
14 Mar 2026
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"Naughty," the Stoneheart chides him, once they part, a smidge of light red blood protruding from the wound inflicted. "I was willing to give you the benefit of the doubt but you are adamant on playing the part of a stubborn brat. Fine then," he says, visibly on board for their game. "It seems a stern talking to isn't enough in your case and I have to rely on a harsher method. Bend over."
or
Sunday decides to be a brat. Aventurine teaches him a lesson. Shenanigans ensue.
- Language:
- English
- Words:
- 5,200
- Chapters:
- 1/1
- Collections:
- 1
- Comments:
- 1
- Kudos:
- 81
- Bookmarks:
- 12
- Hits:
- 1,419
Bookmarked by Cosmistro
30 Apr 2026
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Five times Flins touches Illuga out of curiosity. Five times Illuga feigns ignorance until the truth spills forth.
Flins removes his glove before he touches Illuga's cheek again, marveling at the feel of the soft tissue under his cold skin. All the while, Illuga’s eyes stare into his own—the colours so bright and enticing. The blue of its outer circles rivals the sky, and the red center reminds him of the blood the young man spills so willingly for his homeland. It taints the lovely feeling Flins holds into darker thoughts, and he lingers—longer than he should—letting his thumb run over the same spot over and over again…
“Sir Flins?”
“Yes?”
“I think that’s enough,” the Young Master states abruptly before turning on his heel, leaving Flins standing where he is, staring at his hand as if he’s never had one to begin with.
Series
- Part 1 of Nod Krai Shenanigans
Bookmarked by Cosmistro
24 Apr 2026
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Sunday pushed him down, then straddled his lap, eyes narrowing dangerously. “Go on, then. Make me forget everything. Then I’ll maybe entertain some of your more outrageous requests. If I find myself bored, however–”
“Tsk,” Aventurine snorted, his hands squeezing Sunday’s ass. “You don’t need to worry about that. But, fine. I’ll do as you command."
***
Or, Sunday doesn't know how to cope with his feelings after Robin's spiritual death and accepts a booty call from Aventurine. That's it, that's the plot.
Bookmarked by Cosmistro
17 Apr 2026
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Obedient, Obliging (My Sweet, Selfless Angel) by lilyveil1399 (clairespring7840) for Apotheotic_Sun
Fandoms: 崩坏：星穹铁道 | Honkai: Star Rail (Video Game)
20 Mar 2026
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“Angel.” Aventurine stands. The legs of his chair squeak in protest against lacquered wood. He strides to Sunday, easing behind him, purring and nipping at his earlobe as the Halovian shudders in his grasp. “Anything you want, I’ll give. You know that.” Aventurine watches, waiting, and - when he receives no sign of refusal - dares to palm teasingly at Sunday’s hips as he dips in close. “You know I love to spoil you.”
“You’re incorrigible.” Sunday murmurs in defeat.
“And you’re quite mean when you want something, you know that?” Aventurine’s hands drift upward to map the curve of Sunday’s waist. “You’re well-acquainted with the art of compromise, Mister Sunday. Allow me to plead my case?”
Or,
Sunday willingly volunteers for two weeks of overtime and Aventurine does his best to persuade him otherwise. Oh, and Sunday falls ill. Not to fret - it does little to lessen his libido.
- Language:
- English
- Words:
- 4,744
- Chapters:
- 1/1
- Collections:
- 1
- Comments:
- 19
- Kudos:
- 188
- Bookmarks:
- 26
- Hits:
- 1,917
Bookmarked by Cosmistro
04 Apr 2026
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the art of self-loathing by lilyveil1399 (clairespring7840)
Fandoms: 崩坏：星穹铁道 | Honkai: Star Rail (Video Game)
13 Dec 2024
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Summary
March 7th realizes that she's left her camera on Penacony not long after the Astral Express has disembarked.
Sunday takes the opportunity to procure a Memory Bubble in the hopes that it will be useful as he works to undermine the echoes of Order that linger in his mind.
Unfortunately, that means initiating a conversation with his past self. Things are quick to devolve from there.Bookmarked by Cosmistro
24 Mar 2026
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Summary
Their meetings were always hurried.
A quick kiss on the cheek before the other had to go, a hand snaking around the waist of the other while talking or a soft embrace before a seemingly dangerous fight.
Alternatively, fellatio behind a wall in the midst of a strategy meeting.
or
Lohen is a FREAK
Bookmarked by Cosmistro
06 Mar 2026
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Summary
Sunday’s mind starts to grow fuzzy, his body on the verge of floating from the fragments of praise and proximity, the promise that he’ll be able to let go and have his lover tend to his needs. He can’t fathom how lucky he is that he’s found someone he trusts completely, who knows him, his body, and mind inside and out.
or: sunday had a rough week, so aventurine services him with praise
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Like Sunlight That Never Learned to Stay by Winterene
Fandoms: 原神 | Genshin Impact (Video Game)
14 Feb 2026
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They told themselves it didn't mean anything. A body for a body. Darkness for darkness. What happened after midnight stayed after midnight.
For months, that lie held. No strings. No labels.
Illuga thought he was just being used. Flins thought he was protecting him.
But the cracks are spreading. The silences keep growing heavier. And when Illuga finally breaks beneath the moonlight, Flins gives him an answer he never expected.
(A light that never learned to be held. A keeper who was always too afraid to reach for it.)
Series
- Part 4 of Faelight (One-shot) 🕯️🪶
Bookmarked by Cosmistro
27 Feb 2026
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all is fair in love and leashes by popcornFatality
Fandoms: Trigun Stampede (Anime 2023), Trigun (Anime & Manga 1995-2008)
23 Apr 2023
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Vash tangles the fingers of his prosthetic hand around the hair above Wolfwood’s nape, petting him gently. He relaxes a little under Vash’s touch, and oh, this is going to go so well, he can already feel it. Wolfwood already plays the part he wants him to play perfectly; Vash adores how Wolfwood adores him, how he’s one of the few people in the world who loves him without asking for anything back. There’s no way he’ll say no.
“Nick,” Vash says, looking straight into his pretty dark eyes. “I want you to be my puppy.”
Bookmarked by Cosmistro
25 Feb 2026
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"All I Want In The Whole Word Is To Be Your Good Boy" by ChronicallyQueerDog
Fandoms: 崩坏：星穹铁道 | Honkai: Star Rail (Video Game)
09 Jan 2026
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(Title from the song Bitchboy by The Oozes)
Basically just very horny queer galladay sex. my nonexistent dick ghostwrote this. READ TAGS !! I am a freak (more than this fic would make you believe. insert evil laughter) and will make them also freaks.
wowie my first fanfic. And it's smut.
Bookmarked by Cosmistro
17 Feb 2026
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Wildflower ( a Galladay one-shot ) by spiderboobs
Fandoms: 崩坏：星穹铁道 | Honkai: Star Rail (Video Game)
19 Nov 2025
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Sunday kissed Gallagher on a whim and that breached a dam he had built inside his mind for far too long what concerned this specific Security Officer. If he were to let his desires take a hold, how far would they take him? How far would he fall from his ‘perfect’ grace?
Bookmarked by Cosmistro
17 Feb 2026
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avenday consensual dubcon
Bookmarked by Cosmistro
03 Feb 2026
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a lick of gold by lilyveil1399 (clairespring7840)
Fandoms: 崩坏：星穹铁道 | Honkai: Star Rail (Video Game)
27 Jun 2024
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Summary
Sunday is going to die at the end of this. He knows as much. Even so, that knowledge not make him any more accepting of said pre-determined outcome.
The manacles about his wrists are heavy, singing with the faint melody of the Harmony that imbues them. He's spent weeks bound and wasting away in his cell, not even the luxury of company nor small talk to distract him from the jarring weight of the cramped, chilly hovel he's been forced to call home.
That is, until a high-ranking IPC member graces him with his presence.
~~~~~~~~~~~
Aventurine considers it novel that he derives such pleasure from seeing Sunday bound and restrained, should probably find it within himself to be a bit unsettled. But he shoves such feelings aside and instead focuses on why he's returned to Penacony in the first place: to ask the disgraced Oak family head a simple question under the guise of a pulse check:
"Was it worth it?"
Series
- Part 1 of pride goeth before the fall
Bookmarked by Cosmistro
01 Feb 2026
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Summary
“He’s just like a dog.”
“Who?”
“Mike.” Will shifts his attention to the boy they’re talking about who’s talking to the others with his hands in his pockets. “he’s always like tilting his head like a stupid dog. Sort of like a Border Collie.” He can see the resemblance of Mike being a dog. His clinginess around Will always wanting to have skin to skin contact with him at all times
Huh.
“Yeah..” Will trails off, eyes pinched together in curiousity. “Like a dumb dog.”
Interesting.
Or: Times that Will thought Mike was similar to a dog that led to him first timing being dominant