GB Magical Girl

It was a calm night on spring break, Cecil turned off his games, having decided to go on a break from them, and goes outside due to not having much better to do and the fact that there was a meteor shower scheduled to happen and he was pretty interested in seeing that for a few minutes. By the time he stepped outside, the meteor shower was already happening. As he looked above, one of the meteors flashed brightly as it unexpectedly changes course, flying just above Cecil's house and crashing into the woods beyond. The nerd just stands there, completely stunned at what he just saw.
Cecil: Woah.....
He immediately bolts inside and grabs his phone, calling the one person he actually felt comfortable talking to.
Cecil: Come on, pick up, pick up....

Sam(who is currently at his house playing video games): *picks up his phone* Yo what up Cecil.

Cecil: Sam, Sam, pack your things and get over here as soon as you can. You know that meteor shower that was happening tonight? One of them crashed not to far from where my house is and I wanna go get it before anybody else claims it.

Sam: "Claims"? How do you "claim" a meteor?

Cecil: They take it for themselves, that's how. Now come on, clock's ticking.

Sam: Ugh, fine. 
(later, in Cecil's backyard after Sam shows up)
Sam: So you ready for this space rock hunt or what?

Cecil: Yeah, I'm ready. Now come on.
He heads off to the nearby forest, gesturing Sam to follow.

(Sam follows Cecil, and deep into the woods, Sam sees a glowing light, changing colors, in the dark)
Sam: Woah dude, what's that?

Cecil: It must be the meteor. But...I've never read about them doing this...
He goes into the cave the meteor crashed into, almost entranced by the light.

Sam: *follows Cecil into the cave, and sees the light, also growing entranced by it* Woah....go touch it...

Cecil approaches the meteor, seeing that it has broken open to reveal multiple crystals inside of it, crystals that he's never even seen before.
Cecil: Wh-what are these things?
He reaches out to touch the crystals, and reacting to their presence, two of the crystals shoot out a beam of light that strike Sam and Cecil, knocking them both unconscious.

Hours later, Cecil wakes up, groaning from a splitting headache and a dull pain all over.
Cecil: Ugh....what happ- Wait, what happened to my voice?

Sam: *groans, and leans up, seeing Cecil, then doubles back in shock* Who the hell are you?!

Cecil: My name's Cecil, who the hell are you?

Sam: Okay, Cecil? You may want to look in a mirror or something, that blast of light kinda fucked you up.

Cecil: The hell are you talking about lady?

Sam: "Lady"? The hell are you talking about, it's me, Sam! *looks down at herself* Holy shit I have boobs! *looks up at Cecil* Shit man, you have boobs too!

Cecil: What? What are you talking abou- Oh shit, you're right. What did that meteor do to us?

Sam: Cecil I think that meteor turned us into women......and, when I say that, I'm not complaining...I've secretly always wanted to be one. But without surgery, y'know? I dunno...this shit's fucked...

Cecil: Yeah, I kinda wanted to be a girl too. Do I....do I look pretty?

Sam: Yeah, kinda. Curvy, but you pull it off well. What about me?

Cecil: Well you kinda look the same, except a cute haircut and the boobs.

Sam: *hears a rumbling outside, and jumps up, floating mid-air* Woah, what?! What's going on?!

Cecil: What was that rumbling? Why did those crystals turn us into girls?
A woman's voice echoes through the cave.
Because it was fated to happen.
Cecil: Hey! Who's there?
Nobody, I'm just a voice.
Cecil: Ooookay? Care to explain what's going on?
The meteor was fated to land here and draw you two in so you can fulfill your mission.

Sam: We have a mission? What is it?

When you touched the crystals, you've allowed alien demons to awaken to try and destroy the universe.
Cecil: Wait, touching the crystals allowed for this to happen? Then why give us the crystals? And why turn us into cute girls?
Look, I don't write the rules here. I'm just a voice to explain things to you, and fate has it that you're to use the magical power of these crystals to fight the demons.