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Third person pov... 

The three caged turtles listened to Sacks's stupid and cruel explanation of his evil plans, putting the brothers in mix of emotions, jerking their wrists in attempt to free themself, if the chains weren't so strong. 

Since they're unable to do anything, they only glared at Sacks and everyone else in the laboratory like room, hatred evident in their eyes. Until their attention shifted to single cage to the left from turtles, grunts and groans coming from there. 

Sacks smirks Leo's way, puzzling he's the most protective one by the looks of his behavior, and moved to stand some distance from the other cage, similar to ones turtles are held in.

"Good morning, Sunshine. Glad you can finally join us." All of the brothers' eyes widen in terror when they notice who's Sacks talking to, and what they see makes their hearts beat in pain. 

It takes Y/n some time to adjust to the light so she can open her eyes and regain consciousness, feeling her whole body sore from the position she's been in most probably for couple of hours. But what wakes her up fully is the unbearable burning pain in her back, for some reason feeling too light. 

She completely ignored Sacks talking to her, occupied by trying to turn her head and see what's causing the pain, hissing in the process. Before they knocked her out, she felt fully in her form, nothing missing, but now she feels...naked. Why, though? 

The answer comes when she takes glimpse of her back, her mouth falling open and back with no words like fish, till her throat let out first sob, followed with multiple ones, along with whimpers.

"Now, now, let's make no big deal out of it-" Sacks is still ignored when Y/n's sobs turned into screams of pain and agony, couple of tears running down her cheeks.

The place began shaking suddenly once her screams got louder, plasters from ceiling dropping onto people's confused heads. It calmed down soon, Y/n's screams quietening back into whimpers.

"You have done this to me." Sacks turned his gaze back to the cage, this time Y/n's e/c eyes borring into him in hatred.

"Your wings, which are my own creation in the first place, are now in better place. They will be taken good care off." Sacks's face remain neutral, only holding hidden smirk at those thoughts whirling in his head. Y/n scoff.

"Your creation? Tch. Who do you think you are? Doctor Frankenstein?" There's no sadness or sorrow left on her face or in her voice, only anger and fury shown.

"Someone better. I'm the one that created them," Sacks point over at Leo, Donnie and Mikey, who's been watching them this whole time. The man then pointed at her. "and made you the way you are." Knitting eyebrows together, Y/N stared at him.

"It's unfortune your mother wasn't able to survive, despite not knowing to what she's gonna give life to." At the mention of mother, Y/n's head perk up in confusion, not liking the bad feeling in her gut.

"You knew my mother?" Sacks smirked at her reaction, having his arms folded on his chest.

"She was close friend of mine. Very pure and innocent soul. While of her pregnancy, she's been having unpleasant pains, and I wanted to help her. But I also was very curious man. And I had an idea." All four siblings listened closely to what's Sacks saying, waiting for new pieces of puzzles to be thrown at them so they can puzzle it all together.

"The Mutagen has changing effects, and I believed it will change her pain. To do it, Mixure of Mutagen and bird DNA has been put into pill I gave her repeatedly. I had to lie they were pain killers, luckily it seemed to heal her pain and she had no reason to suspice me." Silence is followed in the room, all of them waiting for the next thing Y/n gonna say. Closing her eyes, she let Sacks' words settle in, gulping the amount of insulting words that so desperately wished to be thrown the man's way.

"Why the bird DNA?" It's another thing that crossed her mind ever since getting her wings, not like she's complaining about them, but if something it could have been ears or tail or deformed body or body parts, so why wings?

She took notice of the way Sacks is looking at her, either way cooking new evil thoughts or remembering at something, or someone. "Her favourite animal was raven."

It, sure enough, makes sense. Y/n's wings are the same shade of black like raven's, as well as shape. Only way beautiful.

Still, though, there's something that Y/n wish to have answer to when she remembered the video April showed her and told her about the woman, which now she understand was her mother.

"Why did you lie about me not making it when my mother died?" It quite surprised Sacks she knows such thing, either way he doesn't care enough to ask.

"To get people off of our back. I needed you to be kept in secret. Maybe your mother died but you didn't, so I continued with research. At the time, when you were only little baby, there were no signs of you being affected by neither the Mutagen or DNA, so-"

"So you threw me in the sewers." Y/n finished for him, putting two and two together. Everything makes complete sense now. She knew he's bastard, but didn't expect him to stand behind everything. He's worse than she thought.

"No, I ordered my people to get rid of you. What they did with you was no longer my concern." In this moment there are only two things that Y/n feel; fury and emptiness.

Even though in real it was Sacks that gave Y/n's mother pills when he wasn't sure what influence does it have, causing her body to change in more ways than only heal from pain, Y/n still feel the blame is on her. Because of giving birth to her, her mother died.

"You're sick, evil bastard." Despite her hands being chained, they shook visibly, clenched in tight fists. She gives him hated mocking face, leaning forward as much as she's allowed to. "People only see you as the good man that's gonna help them all, but I assure you, karma will find it's way to you. If not somebody else, I will make sure everyone know who you trully are!"

Donnie, Leo and Mikey share looks, seeing their sister this aggrieved for very first time. Sacks, once again, only stare back, holding their intenze eye contact that seem to turn air in the room stuffy.

"In that case we gotta make sure it doesn't happen, right?" He half-smirk, unfolding his arms to wave his hand at the people in white coats. "Turn it on."

Right as a bald man in lab coat pressed few buttons, Y/N felt the not-so-slow change in her system, feeling the energy draining from her and replacing with weakness. And so does her brothers, them becoming weaker at slower pace than her, due to her smaller form.

Just then alarm went off in the whole building, meaning someone unwelcomed barged in without invitation. All the panic and noise, though, turned muffled in Y/n's ears, giving her head fine headache and cutting her time sensitivity.

Even though there's almost no strenght in her left, leaving her hanging in the glassed cage by her wrists, she's still conscious enough to pick up banging on the plastic glass across from her. And she's more than happy to recognize blurred red bandana, belonging to her tough brother that somehow avoided getting caught and thrown into cage.

He's talking to her, his mouth moving with incomprehensible words slipping out, in Y/n's ears sounding like there are hands covering her ears tightly. Much to Raph's worry, her head fell hanging again, unmoving like she's a doll held by strings on her wrists, a sight that no person wants to see of their loving ones. And it pisses him off.

So much he pulls out his sias, ready to destroy the cage into tiny pieces when it didn't budge at his strong fists hitting it. To his unfortune, some prick just had to get in way.

By the state she's in, Y/n lost track of time, barely conscious. All she wanna do is sleep and never wake up, which in her place is gonna happen when they completely dry her out of Mutagen, and unlike her brothers, she's got less time than them. 

Leo, Donnie and Mikey all of sudden shoot up with life and energy, breathing heavily at the adrenaline rushing into them that April, who finally came and gasped at the state of her best friend, turned on.

They torred themself from the chains and tubes, breaking the glass cage by jumping out, running around filled with energy in them and saying stuff neither Vern or April can understand them. 

"Donnie, get Y/n!" Leo ordered once their eyes landed on limp body of their sister, and Donnie wasted no time from running over to her cage, in blink of an eye breaking it along with the chains holding her up. Donnie caught her before she can collide with shattered glass, checking her over with the time they got. Not much.

Her skin is colder than usual, thankfully her heart beat is coming back to normal and that put the geek in slight relief. 

He scooped her into his slim yet strong arm, following the way their brothers got down to Raph. He almost let go of her when he stumbled over after landing down, for more safety tightening his grip on her form pulled against his chest. 

"New York City! Times Square!"

"Shredder's going to release a toxin!"

"It's gonna poison the whole city!" 

"And Sacks is gonna sell the antidote!" The three brothers ran around in rush and spilling everything Sacks just told them, taking their weapons from Raphael. 

"Good. Let's do it for Sensei." They all followed Raph outside, the bouncing waking their unconscious sister as she groaned in pain and weakness.

"Everybody calm down! Look how calm I am!" If she had any strenght to open her mouth, she'd tell Mikey to shut up.

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