10 Works by koostiddy
Listing Works
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Summary
Campus heartthrob Choi Beomgyu accepts a bet worth 1 million KRW to get the shy, elusive Huening Kai to sleep with him, but as he gets to know Kai, Beomgyu realises there might be more at stake than just 1 million KRW.
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The detective who chose ambition over love is forced to interrogate the boy whose life he destroyed – and the only thing more suffocating than the evidence is the love that refuses to die.
or: a fic based on Choi Hyeongsa and Choi Gwontu, inspired by TXT's series Hello Strangers.
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we haven't started, did i make you cry? by koostiddy
Fandoms: TOMORROW X TOGETHER | TXT (Korea Band)
31 Jan 2026
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Kai gets sent home by the producers after being unproductive at the studio. Feeling upset and discouraged, her girlfriends, Soobin and Beomgyu, cheer her up the best way they know how:
By fucking her stupid.
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Fake It Til You Make Out | NOT TO DO EP.〈Fall in Love〉 by koostiddy
Fandoms: TOMORROW X TOGETHER | TXT (Korea Band)
23 Dec 2025
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Kai has had the biggest crush on Beomgyu since his trainee days, so when he discovers that Beomkai is the least popular Beomgyu ship, he takes it as a personal attack.
Determined to change that, he responds by clinging to Beomgyu at every opportunity, publicly gushing about him, and aggressively pushing the Beomkai agenda under the very professional justification of fanservice – when in reality, the only person he’s servicing is himself.
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scream (the way you would if i ravaged your body) by koostiddy
Fandoms: TOMORROW X TOGETHER | TXT (Korea Band)
03 Dec 2025
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Everyone else sees only the sweetness. That’s the story told over and over again across campus, in whispers and half-jokes and fond sighs: Soobin, the perfect boyfriend. The patient leader, the soft-spoken council president, the boy who always has a hand free to carry Kai’s things or an umbrella tucked into his bag just in case. To most people, there’s nothing more to it than a portrait of romance so ideal it almost doesn’t feel real.
But what Kai would never, ever let slip, even if someone begged it out of him, is that Soobin is also filthy. Sin incarnate behind closed doors. The same boy who bows politely to professors and listens patiently to his friends is the one who pushes Kai down into the mattress and fucks him open with an unrelenting pace, relentless in a way that makes Kai forget his own name. He uses him like a toy, bends him until he’s pliant and trembling and begging, and never once apologises for it.
tl;dr Soobin's an angel in the streets and a devil in the sheets.
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Kai pokes his head out, curious, and his eyes fall on a stranger balancing a stack of boxes, shoulders straining under the weight. For a moment, Kai doesn’t breathe.
Pretty.
The man freezes. Slowly, he lifts his head, and their eyes meet. Kai’s stomach plummets straight through the floor.
Then the stranger smiles. Kai sees the faintest hint of pink brush his cheeks, like maybe he isn’t used to compliments blurted out so honestly.
“Thanks,” he says simply.
Kai’s heart seizes.
The full horror dawns on him in a rush: he said that out loud. He called his new neighbour pretty. To his face. Within five minutes of the man even moving in.
Kai's cats keep playing matchmaker between him and his pretty new neighbour.
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the green beanie effect by koostiddy for abyssoftempest
Fandoms: TOMORROW X TOGETHER | TXT (Korea Band), Korean Actor RPF
28 Aug 2025
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Taegoo’s head snaps up instinctively, and everything inside him goes still. The boy is standing beneath the stage lights, ethereal in the simplest thing: an oversized green knitted beanie, fluffy and soft, the stitches curling up just so at the corners until it looks like cat ears sprouting from his head. The crowd loses its mind, shrieking with delight, but Taegoo hears none of it. His blood roars in his ears, heat slamming into him with such force it almost buckles him forward in his seat.
When Uhm Taegoo gets invited to the second day of Act: Tomorrow in Seoul, he doesn’t expect to walk away with a mission, but the moment he spots Beomgyu in that fluffy green beanie, looking far too pretty for his own good, Taegoo decides he’ll give in to the boy's game and give him exactly what he wants.
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“I’ve just never done things like this before,” Kai giggles nervously, fiddling with his glasses. "Or at least before I met you guys."
“That’s okay, puppy, not a lot of people have slept with two people at once before,” Yeonjun coos, trailing open-mouthed kisses down his neck.
“No, I mean, I’ve never slept with anyone ever,” Kai blurts out before he could even process what he’d just said.
There’s a beat of silence before the couple look at him with comically wide eyes, screaming in unison, “What?!”
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After accidentally blurting out that they had taken his virginity, Kai finds himself being wined and dined by Soobin and Yeonjun. And of course, afterwards, he is brought into a whole new realm of pleasure he never knew even existed.
Series
- Part 2 of we saw you from across the room and...
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Kai, a quiet introvert who prefers the comfort of his own home, finally agrees to step outside his comfort zone and go to a bar after weeks of convincing from Taehyun. Having been reluctant about the whole thing, Kai finds himself in an unfamiliar environment where he crosses paths with a strikingly handsome couple. As the night unfolds, Kai's curiosity is piqued, and he soon discovers that there’s more to this chance encounter than meets the eye – perhaps even lessons about himself and this new world he’s about to leap headfirst into.
Series
- Part 1 of we saw you from across the room and...
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Apo had always told Jeff that he was the glue that held the band together, but when a certain bushy-browed man moves back into the city, Jeff can’t help but think that he was merely a piece of flimsy tape temporarily holding the pieces together in place of the real glue – Mile.