You walk through Waterfall to track down where this beautiful tune, you've heard it a few times as you've passed through over the months but it's never been so close before. You being the curious little human you are, you decide to finally find out where it's coming from. As you turn a corner a small patch of blue grabs your eye, it seems to be where the tune is coming from. 

"Uh... hello?"

The tune stops as the monster turns and begins shaking at the sight of you. They seem to be a lot like a mermaid or siren. Probably a siren.

"U-Uh... um..."

They begin to try and get around you but your blocking most of the path, they visibly begin to freak out at the situation.

"Hey! Hey... calm down. I'm not gonna hurt you, i'm (y/n). You have a lovely voice."

The monster calms a little at your name and compliment, they seem to be incredibly nervous and shy.

"Hello (y/n). I-I'm Shyren."

Shyren. Suiting name. You smile and sit cross legged, you give her a happy smile.

"I've heard you singing a few times now and I've sorta... added lyrics to it."

"Huh? Y-You have?"

"Yeah! It's so pretty... I just had to!"

She smiles and brushes some hair out of her face, she's a very pretty monster. If mermaids were real you wish that they look like Shyren.

"Can I... sing to your voice Shyren?"

"H-Huh!?! Really?"

"Yeah! I bet it'll sound good. Even if it doesn't, it'll be fun!"

You see her face turn a little skeptical but also a bit of happiness, she really wants to say yes. You smile at her again and see her nod slowly, making you gasp and clap in delight.

"Alright Shyren! You start and i'll come in when i'm ready!"

"Okay then (y/n)."

You listen to her tune for a few seconds, finding a good place to add your lyrics into the melody. You sway back and forth as you move to the music.

"You fascinated me

Cloaked in shadows and secrecy.

The beauty of a broken angel."

"I ventured carefully,

Afraid of what you thought I'd be.

But pretty soon I was entangled."

"You take me by the hand.

I question who I am."

"Teach me how to fight,

I'll show you how to win.

You're my mortal flaw

And I'm your fatal sin.

Let me feel the sting

The pain

The burn

Under my skin."

"Put me to the test,

I'll prove that I'm strong.

Won't let myself believe

That what we feel is wrong.

I finally see what

You knew was inside me,

All along."

"That behind this soft exterior...

Lies a warrior."

"My memory refused

To separate the lies from truth

And search the past

My mind created."

"I kept on pushing through

Standing resolute which you

In equal measure

Loved and hated."

"You take me by the hand

I'm seeing who I am."

"Teach me how to fight,

I'll show you how to win.

You're my mortal flaw

And I'm your fatal sin.

Let me feel the sting

The pain

The burn

Under my skin."

"Put me to the test,

I'll prove that I'm strong.

Won't let myself believe

That what we feel is wrong.

I finally see what

You knew was inside me,

All along."

"That behind this soft exterior...

Lies a warrior.

Lies a warrior..."

"You take me by the hand

I'm sure of who I am."

"Teach me how to fight,

I'll show you how to win.

You're my mortal flaw

And I'm your fatal sin.

Let me feel the sting

The pain

The burn

Under my skin."

"Put me to the test,

I'll prove that I'm strong.

Won't let myself believe

That what we feel is wrong.

I finally see what

You knew was inside me,

All along."

"That behind this soft exterior...

Lies a warrior."

"The pictures come to life.

Wake in the dead of night.

Open my eyes

I must be dreaming."

"Clutch my pillow tight,

Brace myself for the fight.

I've heard that seeing...

Is believing."

You had blanked out during the song and now you realise that you've gained an audience, Sans had apparently been selling 'tickets' in the form as tissues. He's now counting up gold in the back of the room, winking at you as he locks eye sight with you.

"Thank you (y/n). That was nice."

You look back at Shyren who's now smiling brightly, you've seemed to have helped her gain confidence.

"It's my pleasure Shyren! I wish to do it again sometime!"

"Me too!"

You and Shyren talk with a few others who were once the crowd for a few hours until it became late, you leave with a wave and a smile to Shyren. All the way home you hum the tune you and Shyren were singing to, it was beautiful to listen to.

~One Month Later~

Mettaton had recorded you and Shyren's song and had posted it on the Undernet and had played it on his show, you now hate him and wish to extract revenge.

"I blame you Sans."

"huh?"

You look at Sans and he looks confused, you did just say that out of thirty minutes of complete silence.

"You handed out tickets to everyone when I was singing with Shyren. Mettaton only found out because of your Undernet post."

"what can i say? i'm a gossip."

Without warning you tackle the small skeleton but he slips out of your grasp by slidding out of his jacket. You chase him around for hours afterwards, only stopping from Papyrus picking you up and placing you in his room.

"YOU'LL REST IN HERE UNTIL YOU'VE CALMED DOWN!"

He closes the door and presumably locks it, he's such a waffle.

"A waffle? Why the hell did I call him a waffle?"

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WAFFLES! :D

So here's Shyren! I always thought that her character design was great and her concept was pretty cool. So yeah!

Remember to request your own (character/OC) X Reader if you want me to write one! :D

I hope you all enjoyed! Bai!