undersun



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  1. Public Bookmark *

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    When Kaeya loves, he is the perfect son, the best little brother, the strategic knight.

    But when Kaeya breaks, he burns.

    So when Kaeya feels like he’s been on fire for far too long, he decides to do something about it.

    Of course, if one wants to put out a flame they douse it in water. However, how can one do that when they don’t even notice the burning in the first place?

    Not everyone can smell the smoke before they realize that something has caught fire. It was like that for Kaeya Alberich.

    But now that people know, can they put it out in time?

    Series
    Language:
    English
    Words:
    11,136
    Chapters:
    1/1
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    12 Jul 2026

  2. Public Bookmark *

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    When one of Albedo's experiments goes wrong, Captain Kaeya loses the ability to lie. Which would be fine, had it not been for the fact that the Cavalry Captain's only true safety net was the intricate web of lies he'd weaved for himself over the years.

    Inevitably, things start to unravel far faster than Kaeya would have liked, which, added onto other additional side effects, means that he is in for one hell of a week.

    Language:
    English
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    49,170
    Chapters:
    5/5
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    12 Jul 2026

  3. Public Bookmark 35

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    Kaeya Ragnvindr was not a name that would be forgotten quickly. A beloved knight, an adored younger brother, and a quiet and caring lover, he left his mark on everyone on Mondstadt who loved him. And he loved them in return, that much was never in question. That was why his disappearance, so soon after his father's death, left the City of Freedom with an even bigger hole in their souls to try and fill.
    ~
    Bennett did not plan on solving a case that everyone had called closed, that he hadn't even known about, when he got caught out in a rainstorm that he was pretty sure his bad luck caused.
    ~
    What if that night, all those years ago, went slightly differently?

    Series
    Language:
    English
    Words:
    30,580
    Chapters:
    3/7
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    186
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    35
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    12 Jul 2026

  4. Public Bookmark 12

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    Murdered by his mother, abandoned in an icy river, with no idea how human society worked and severe trust issues.
    The primordial human prototype - also known as Albedo 2.0 - had enough.

    His plan? Replace Albedo. But it's been years and he was slowly mellowing down. Plus, he was still doubting never being found out. No... coexist next to him and hope he'll ever fit in? Hide for eternity as Albedo's shadow? Every option seemed awful.

    At least the bluhaired knight that Albedo was dating would immediately notice, plus he wasn't sure he could take Albedo on...

    He just... didn't expect Kaeya to save him instead and show him what the future could bring.

     

    What begins is a journey of self discovery, creation of identity and acceptance. Maybe even someone like him deserves happyness in the end.

    Language:
    English
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    75,560
    Chapters:
    15/?
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    12
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    06 Jul 2026

  5. Public Bookmark *

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    “Is your allegiance and heart with Khaenri’ah?”

    “No, it lays with Mondstadt.”

    “So then, what are you worried about? Are they coming to bring you back as their…”

    “Their prince?” Kaeya finished the sentence for him, “No… I don’t believe they are anytime soon.”

    A strange pause in their conversation made Kaeya want to burst out in laughter in relief. How anti-climatic.

    An alternate universe where Kaeya and Diluc never fought or had a falling-out. Their story of being brothers and happy... Until Kaeya's past decides to catch up with him and he finds himself scared for his own safety, as well as the future of Mondstadt.

    As Diluc discovers there's more to his brother's past than he thinks, he finds himself befriending a Fatui Harbinger to help them out.

    Language:
    English
    Words:
    25,587
    Chapters:
    18/29
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    Comments:
    269
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    845
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    05 Jul 2026