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CRIMSONFEVER

Summary:

[yandere!non-human!various x fem!undine!noble!reader]

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Rebirth.

Underneath the crimson moon.

A necklace stolen.

Reckoning.

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[A rework of Crimson Fever. Not for a general audience. Has minor meta elements. No gen-AI has been used.]

Notes:

(See the end of the work for notes.)

Chapter 1: SCORGE

Notes:

(See the end of the chapter for notes.)

Chapter Text


 

…they shamble across the shore line. Their only purpose in life… a pile of splintered wood at the edge of the border.

 

No one else.

 

The immaculate jewels and pearls glint under the bloody moon. Slick blood still stains their smooth skin. Only theirs remain… long after the wounds closed.

 

No one else.

 

A mist begins to envelope the woods. They growl. Spurred on by the ebbing, scarlet light, they sprint into the rainforest. One destination.

 

No one else.

 

Only the creak of the trees. There. A deep pond, enough to fit their body.

 

No one… a glint on the surface. Their gaze clears up. They look around, confusion swarming them, clamping their clawed hands around the diamonds and pearls. It doesn't take long for them to surmise that they're back here, once more. Of course… as a permanent dweller. They sigh and thumb the only thing that they have of their previous life.

 

The one that they’ve stolen from him.

 

Grimacing at the thought, they sit down on the ledge of the pond, observing the celestial body. Clouds consume the sky, more keep piling on. The mist closes in on them.

 

They chuckle. “No one… but mine.”

 

Sploosh.

 

Deeper. And deeper. Into an eternal slumber.

 

Notes:

7/18/2026: I wanted to put this here to clarify a few things. The reader-insert in this story is a kemonomimi (has animal characteristics, like ears and/or a tail) fish-girl. Similar to a mermaid, just called an undine. She is not only naive but also insecure in herself overall.

As stated in the description, all the yanderes are non-human. They vary from kemonomimi, to full on monster boy/girl.

Besides one, the yanderes in this story will start out being fairly normal before they become more crazy/abusive as they are treated over time. I planned for three love interests, but there is the possibility for more as I write.

There are mature themes, but nothing explicit besides language.