Brooke's POV:
It's pretty quiet tonight here in the lair until Donnie cheers in excitement from his lab.
Donnie: "I did it! I really did it!"
Leo: "Did what?"
Mikey: "Invent pizza that doesn't get soggy in milk?"
Donnie: "I finally made it. Retro-mutagen, you guys! The key to turning Mr. O'Neil human again. And you, too, Sensei."
Splinter: "Human once more? Save April's father first, and then I will consider it."
Splinter walks off to the dojo to meditate while Mikey grabs the beaker of retro-mutagen.
Mikey: "Ooh! What if I turned myself human again? I wonder what I'd look like."
Raph: "We were never human to begin with, genius. We'd just turn back into turtles."
Donnie: "Plus, I've only got enough for 2 doses. One for April's dad, and one for Master Splinter."
Me: "Can you make more of this stuff?"
Donnie: "Yeah, but it takes 10 canisters of mutagen to refine just 1 tiny dose of retro-mutagen. And I don't have any left. But at least we can find your dad and change him back, April."
April: "I'm just speechless! Thank you! Thank you so much, Donnie! You're the best!"
April pulls him in for a kiss on the cheek, to which he responds with a goofy grin and crashes into his desk.
{Time skip}
We've managed to track Mr. O'Neil and are standing atop a rooftop across the street from him.
Leo: "Alright, April. Hang back. We don't wanna rile up your dad like last time."
April: "But, I can help. I can calm him down."
Raph: "Last time you tried that, he took you to his nest and tried to feed you dead rats."
April: "Good point."
The turtles and I deploy our grappling hooks and cautiously approach Mr. O'Neil.
Me: "Alright, we gotta do this quick. Raph & Mikey, we can't let him escape. Donnie, spray him fast."
Donnie is about to spray the retro-mutagen, when something from behind startles him, alerting Mr. O'Neil of our presence. As a mutant fly approaches us from above, he flies off into the night.
April: "Dad, no!"
Stockman-Fly: "Sentimental humans! Give me the retro-mutagen now!"
Leo: "Another mutant?"
The fly lunges for the vial, but Donnie leaps onto him simultaneously.
Donnie: "Get your claws off that vial!"
The turtles leap into action, but the fly drops the vial. I deploy my grappling hook to hang from the edge of the roof but fail to grab the vial as it breaks over the hood of a parked car. Then, Stockman-Fly takes April and me as hostages.
April: "Let us go, you ugly germ farm!"
Stockman-Fly: "Silence!"

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Love Never Lost
FanfictionBrooke has trained with the turtles since they were five years old. Lost and alone, she needed a good home & friends she could trust. When she ran into Splinter, she was given both of these things & more. Now the turtles have become her brothers, wi...