This is not the beginning of the book, this is a chapter on how you and Spinel sing this song and what you do during it, so I can just do the lyrics in the actual story without "distributing the flow". And this how your voice sounds.

Bold letters means you're speaking with a demonic voice.
[Third person pov]
A giant injector loomed over Steven and the Crystal Gems.

???: Ey yo!

They looked up to see two shadowy figures, they couldn't make out much, but they can tell that one had pigtails, the other had short hair. The one with short hair was talking to them.

???: Are you Steven Universe?

Steven: Uh...yeah.

They both smiled, and the one in pigtails spoke.

???: Good.

The one with pigtails shaped her hand into a horn and blew, while the other let out a blood curdling scream, and the injector dug into the earth. The figure with pigtails jumped down to the halfway point of the injector with a audible boing sound, and shot an evil glare. Steven and the gems finally got a good look at her.

This gem, is Spinel. Of course, the gems don't know that, well, not all of them.

Spinel: You coming or what?

The second one grinned, and took a leap of faith. Their body shattered on impact, causing Steven and the gems to gasp. But then they were completely shocked when their body parts naturally put themselves back together. They chuckled at their shocked faces. This gem is Painite, and none of the gems knew who he was.

Spinel: Well well well well well! Let me get a look at the menagerie!

Spinel shaped her eye into telescope.

Spinel: You must be Amethyst, you must be Garnet, and you must be-
Painite: Wait wait! Let me guess! Uh, Pink Diamond's pearl!

Spinel: Yes! Good job!

Spinel retracted her eye.

Painite: She took you, with her. Hehe, how swell!

Pearl: It can't be.

Spinel: *Giggling* Oh but it can be, and it is! I've got a new style, a close ally, and a few new toys-

Spinel enlarged her hand and banged it on the injector.

Spinel: -that are going to put an end to your happily ever after, once and for all!

Steven stepped forward.

Steven: Woah woah this is gotta be a misunderstanding. In case you two haven't heard, I've established peace across the-

Painite: Yeah, yeah we've heard. We've had your little message to the universe, hehehehe, ON LOOP!

Painite pulled a chain whip out his hand and hit Steven in the face, knocking him back. The gems got there weapons out, and Painite retracted his whip.

Painite: We just love that part, were Pink Diamond spends the rest of her days, on this-

Painite twitched a bit.

Painite: NOWHERE planet! With a bunch, of NOBODIES!

Spinel and Painite jumped down and leapfrogged towards them.

Painite: Oh that's right we've heard the story over and over again.
Painite and Spinel got in Steven's face.

Spinel: Gee, it's swell to finally meet her other friends.

Spinel and Painite went to Garnet and dodged all her punches.

Spinel: Oh that's right we've heard the story-

Spinel flicked Pearl's nose while Painite booped it.

Spinel: -don't really like how it ends.
Spinel pulled Amethyst' hair over her head and Painite spun her.

Painite: Golly, it's swell to finally meet her other friends.

Spinel stretched her arms out and grabbed Pearl, she wrapped around a tree branch and hung Pearl upside down bouncing her.

Spinel: What did she say about us, what did she say?

She went to Amethyst and bounced her on her feet.

Spinel: What did you do without us, what did you do?

She went to Garnet and bounced her on her arms.

Spinel: Did you play games without us, what did you play?

Painite crawled on all fours to Steven.

Painite: Did you think all this time we wouldn't find out about-

Painite took his head off, his voice sounding more demonic.

Painite: -YOU?!?!?!?!
He put his head back on.

Painite: Oh that's right we've the story-

Painite wrapped his chain around Stevn and swung him into the gems.

Painite: -over and over again.

He and Spinel went to the top of the lighthouse.

Spinel: Gee, it's swell to finally meet her other friends.

Steven and the gems were trying to recover.

Garnet: They're running circles around us.

Amethyst: I'm rusty, give me a break!

Pearl: It really is her, but she can't be serious.

Steven: You know her Pearl? Can you tell us who she is?

Painite's smile completely faded, and was replaced with anger.

Painite: Who is she? What about me? Do you know what you're saying? I'm a forgotten player of this game we are playing!

Spinel pulled something out her gem.

Spinel: Let's play another game, this time we get to win!

Painite pulled out his chain.

Painite: Lives on the line!

Spinel's item turned into a scythe.

Spinel: Winner takes all!

Painite+Spinel: Ready or not let's begin!

Spinel and Painite jumped down and Spinel swung her scythe wildly causing Steven and the gems to back off.

Spinel: Oh that's right we've the story-

Painite threw Steven away.

Spinel: -over and over again.

Painite: Golly, it's swell to finally beat her other friends.

Spinel dove at the gems. They moved out the way, and she wrapped her legs around the drill to rebound and wrap around the lighthouse.

Painite: Oh that's right we've heard the story-

The gems ran towards Spinel only to be held back by Painite's chain, holding them in place.

Painite: -don't really like how it ends.
Spinel unwrapped from the lighthouse and headed full speed at the gems.

Spinel: Gee, it's swell to finally beat her other.

Painite tightened his grip on the gems.

Painite: Other.

Spinel+Painite: Other.

The gems were cut clean in half.

Spinel+Painite: Freinds.

Painite: HAHAHAHAHAHAHA!!!!

[A/n pov]
Alright, that's the end of the best song in the universe, pun not intended. The actual story will start before this. Kay, lataaaaaaa.