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phoebepheebsphibs · 6 months ago

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Double-Mutated Mikey

Chapter 19: Pathology

Continued from the short story written by @boots-with-the-fur-club

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Mikey wakes up to the sound of shouting and yelling.

"Oh, no.... oh no... oh no, oh no, oh nonononono...! Why today? This couldn't have happened like, last week, or maybe next month?!"

Mikey wonders what could be so upsetting to Leo. There's the sound of rushing back and forth, people shouting and whining and acting all terrified. He watches from his room as people keep running past his door.

A figure stops in his doorway -- Leo, by the smell and voice -- and flicks on the lights while yelling worriedly. The lights blind him momentarily as his vision switches from heat-seeking to binocular.

"Mikey! We gotta get you somewhere safe, bud..."

"Why?" he croaks.

Mikey doesn't even have to get out of the hammock before Leo scoops him up -- blankets and all -- and starts running with him.

"Dad's sick with rat flu!"

"Huh?"

"You don't remember rat flu?" Leo asks, looking down at Mikey as he runs. "Well, uh... it's this whole thing, it would take too long to explain. Basically, he gets a really bad cold and has weird symptoms. We don't wanna risk you getting infected just yet, so I'm having you bunker down in Dee's lab."

Mikey isn't sure what is going on, but everyone seems frantic. Leo drops him off in the lab, where Casey is also hiding out.

"Are you sure we'll be safe in here?" Casey asks, watching as Mikey is gently set down on the floor, blanket still wrapped around his shoulders.

"Probably... Splinter will be more focused on us than you, so all should be well... Have you ever seen rat flu, Casey?"

"A few times, though I don't remember much," Casey says with a shrug. "It happened mostly when I was a toddler, and before we had to eat Master Splinter."

"Okay, well, there's the seven stages -- wait, what?"

Leo shakes his head and holds up his hands.

"Nevermind, forget I asked, moving past, I don't ever want to know that story..."

"It was the apocalypse, we were running low on food, and his last wishes were--"

"But back to the rat flu!" Leo interrupts loudly, "Splinter will be going through the full seven stages, and those are way too chaotic for Mikey to be caught up in just yet. Besides, we don't know how well he's going to react to the flu if he should get contaminated by the germs. It's safest to just keep him in preemptive quarantine for now..."

"Alright, so what's first?" Casey asks, sitting next to Mikey.

Mikey shuffles just a bit away from him, eyeing Casey's hands nervously as his brother explains.

"First stage is fever, which -- oh man, I totally forgot about that..."

"What?" Mikey asks, concerned for why Leo is getting so bent out of shape. "What wrong?"

"Dad's first symptom is he gets overheated from the fever, so he cranks the AC all the way up," Leo groans, rushing out and shouting to the others. "Raph! I need blankets and a heater, stat!"

"Cold?" Mikey asks nervously.

"Yup, very cold. But we'll be prepared, don't worry," Leo says, as Raph rushes in with a stack of quilts and a heater.

"Will this be enough?" Raphael asks, handing half of the stack to the leader.

"I think so... Casey, there's a hoodie here, you should bundle up too," Leo says, throwing the oversized shirt at the future boy while Raph wraps Mikey up like a burrito.

"Danger?" Mikey asks nervously, watching Raph.

"No, there's no danger, it's just crazy and confusing," Raph reassures him.

Mikey can smell the fear. He can hear the nervous twinge in his voice. He can see the wrinkles on his head forming.

But Mikey trusts them. They may be scared, but they will help.

Mikey snuggles into the quilts and hums. Leo and Casey set up the heater before the two brothers leave the room.

"Casey knows how to work the door, so if anything goes wrong, he'll open it up, okay? But unless you hear one of us say something, keep this door locked for now."

"Leo safe? Raph safe?" Mikey asks.

"Sure! Like I said, it's just a flu."

Leo hands a communicator to Casey before he winks at Mikey, his smile strained and thin. The doors close with a hiss and a click, bolting from the inside out.

Mikey and Casey sit quietly as they wait.

Soon enough the air seems to chill, and their breaths can be seen as fog in the room. Mikey squirms in discomfort, pulling the blankets closer. Casey starts to shiver.

The communicator beeps, and Leo's voice chimes in.

"Stage one is in progress. You guys okay?"

"We're f-f-fine," Casey chatters. "K-k-keep us upd-d-dated."

"Will do."

The line clicks, and the two sit in silence.

Mikey shivers. The blankets help, but he can still feel the frigid chill of the air through the sheets. It doesn't hurt yet, but it is uncomfortable. The floor is ice under him. He tucks the quilts under his feet and legs as he tries to insulate himself better. He looks over to see Casey suffering by the heater. Mikey chirps at him to get his attention.

"Sh-sh-share?" he asks.

Casey looks Mikey up and down before nodding. Mikey hops over and opens his fortress, a gush of icey air whooshing in and stabbing his unprotected legs. He gasps and hisses through his teeth as Casey slides in and helps wrap the blankets around them again.

"The shared body heat will h-help," he says, his shivers shaking him to the core. "Thanks. I-I-I didn't think you l-liked m-m-me anymore..."

Mikey frowns.

"M-Mikey not h-hate Casey..."

He slinks into his shell a bit more.

"...Mikey s-s-scared of Casey..."

"Scared?" Casey stares wide at Mikey. "Why?"

"Mikey... not r-r-rem-member-r Casey. But Cas-s-sey human, humans scare Mikey," he whimpers.

Mikey hides his face under the blanket. Or maybe he's just trying to keep warm.

"Humans mean. Hate Mikey. Hurt Mikey. Mikey scared a lot... Mikey scared."

Casey sighs.

"I guess that makes sense. I-If I'm honest, I'd probably be scared of humans t-t-too..." He wraps his arms around the bundle. "But I'm glad you told me. I thought you just hated me!"

Mikey huffs, a shivering chuckle.

"Mikey th-th-thought C-Casey hate Mikey!"

"What? Why?"

"C-C-Casey-y look s-sad," Mikey explains. "Casey look sad at brothers, too. Casey l-look s-scared of Mikey..." Mikey sighs at the last sentence. "Mikey scares brothers. Mikey see. Mikey scary."

"You're n-not scary!" Casey lies. "We're just... concerned for your health. You went through a lot of injury, and we weren't there to help you. That's what scares us."

Mikey peeks up at him. CJ gently presses his head against Mikey's.

"We... we were so terrified, Mikey. You have no idea how happy I was to see you back... last week without you was a nightmare. I've never seen Leo so scared, and I saw him sacrifice everything to send me--"

He clears his throat.

"Uhm... getting off-topic. What I-I'm trying to say is... we're not scared of you, we're scared for you."

Mikey gives him a shy smile. He knows that Casey is lying. He can smell it. But Casey doesn't want to hurt him. Mikey purrs, nuzzling Casey's shoulder. CJ chuckles and pulls Mikey closer.

A moment later, the communicator beeps again.

"Stage two! Repeat, stage two, wild rat man! Donnie has been compromised!"

Casey pulls his wrist up to his face and leans in.

"What's going on out there?!"

"Donnie got pancaked by Splinter, he's quarantined now."

The boys hear a feral squeal over the comm lines, and both eyes go wide.

"S-S-Splinter-r-r?" Mikey asks.

"RUN!" a shout over the comms comes in. "Raph, this way, this way!!"

"W-w-ait, if Splinter's past the f-f-fever s-stage, then why is-s it still s-s-so c-c-c-cold-d-d???" Casey chatters.

"I told you, Donnie got quarantined! He hasn't rebooted the AC yet, and we're on a whole new system now so-- OH WAIT NO LOOK OUT!!"

There's a scuffle and a shuffle heard over the comms, and the two boys listen in intense silence. After a moment, Leo comes back onto the comms.

"Okay, we're good. Close call. How're you two holding up in there?"

"Cold," Mikey complains.

"We'll get to work on resetting the AC. Raph got Donnie's S.H.E.L.L.D.O.N.2.0 to lead Splinter away for the moment... I think we're in the clear..."

Several minutes pass by. Mikey and Casey sit in the lab, cold and waiting. Ten minutes go by. Fifteen.

Mikey's body starts jerking, seizing, convulsing. The pain starts to set in, his body can't handle the low temperature. He gasps, a sharp stabbing sensation in his chest that aches and spreads across his body. He doubles over, clutching his chest with one hand and gripping the blankets with the other.

Casey pulls him closer. Mikey is pressed against his chest, he can CJ's his heart beating. He focuses on that.

Ba-dump. Ba-dump. Ba-dump.

Casey pulls the comms up again.

"Guys, what's the holdup? Mikey's starting to--"

The lights go out. The heater shuts down. The door hisses and a loud click echoes in the room. Mikey yelps and hugs Casey.

"That's... not good...."

The comms click.

"Ah! Ninja supreme! Stage four!!"

"What happened to stage three?!" Casey shouts. "What have you been doing this whole time?! WHERE ARE YOU GUYS?!"

"He's in the vents!" Raph shouts through the mic.

Mikey hears scratching and scurrying from above. Mikey makes a quick sound, a yelping chirp to warn Casey, before Splinter suddenly descends from the ceiling vents and lands with a smoke bomb on the floor. Mikey and Casey scramble in opposite directions.

The blankets fall off of Mikey's shoulders. He whines in pain, holding himself tight as the cold causes his body to go rigid like he's been frozen solid.

His tail jerks, curling around him in snapping movements, like he's a disc been scratched too many times and it keeps freezing and playing one moment at a time. It's agony, it's killing him, Mikey can't breathe anymore... his lungs feel like they're collapsing inside of him, his bones turn seize up and go stiff in place, his head is buzzing with pins and needles, and his limbs feel like freezer-burn.

Splinter -- in his full ninja garb -- crouches over Mikey and touches his shoulder, inspecting him. Mikey winces, the meager warmth from his father's hand burns against the ice that is his scaly skin. Casey shouts out Mikey's name, and Splinter dashes away into the darkness.

Casey rushes over to Mikey, checking him for injuries.

"Mikey? Mikey!! Michelangelo!! Oh no, oh no... can you hear me?"

Mikey tries to lift his head up to talk to him. He can barely move it, it feels stiff and it hurts to turn his neck. He manages to move his eyes to look up at Casey. He opens his mouth, trying to force out words, a croak, a whimper, anything. All he can manage is a ragged and laboured breath, a gasp for air as he writhes without moving.

"I'm gonna get the guys, I'm gonna get you warm, just stay with me!"

Mikey loses all feeling in his limbs. His tail stops moving. His torso goes numb before it too becomes lost in static. Mikey turns some kind of ghost, and nothing can touch him anymore, and nothing hurts anymore. His ears start ringing, a stuffy distortion that blocks out most sounds. Casey Jr. is two feet away from him, but his voice is far far away. Time slows down, an tormenting eternity that is all of three seconds long.

"Stay with me, Mikey! Stay... stay..."

Everything goes dark. Mikey's eyes slip shut.

He exhales softly.

He doesn't inhale.

"We have to find some way to keep him in line!" Dr. Timothy shouts. "Otherwise, he'll be running rampant throughout the labs!"

"Dr. Chaplin is working on a device that can control--"

"I know what he's working on, Abigail," he interrupts. "But that device won't be ready for quite some time, and we need something now!"

"Then, perhaps we turn to biology?" she offers.

"How do you mean?"

"This specimen has several different species genetic code integrated into his DNA. Perhaps we can find some weakness within the genetics to use against him, should the necessity arise."

"Hm... that could work. Nothing lethal, of course, just uncomfortable for him. Did you have anything specific in mind?"

Mikey watches from his cage as the two scientists look over a series of codes before turning back to look at him.

"Could work..." Timothy mumbles.

"We'll never know unless we try," Abigail replies.

Mikey watches as the two walk out for a moment before coming back in, wearing thick jackets. Timothy turns the air down. Mikey is confused until he starts to jerk slightly. What's... what's happening to him? Why does the air hurt?? Timothy watches him start to shiver and convulse.

"I was right," Dr. Abigail Finn says with a sly smile. "The three reptile DNA mixings have caused a severe reaction to brumation. His system goes into shock."

"Let's see how much he can handle," Timothy chuckles before grabbing a fire extinguisher and soaking Mikey in a cold foam.

"What are you doing?!" Abigail asks, moving away from him.

"Conducting an experiment, of course."

Mikey screams in pain before toppling over. It burns with how cold it is.

"We'll have to weaponize this," Dr. Timothy laughs. "Should be simple enough to concoct a device that can create cold gusts of air... I'll have Honeycutt get to work on the designs..."

Mikey shivers, drowning in the icy cold pain...

Mikey's consciousness slowly thaws. It's still dark... his body is still numb and lost... but there's... sound...

"...Mikey... poor guy... should be getting warmer..."

"...didn't mean to, I tried..."

"...not your fault, Pops, just what happens..."

"...should have done better... it's been hours... is he okay?"

"...brumation...body slows down... he'll be fine..."

"...getting a pulse, he's breathing again...!"

"Mikey? Can you hear us?"

Mikey moans, the first part of his body he can (sort of) control. He hasn't been this tired since... since... some time ago. The first mutation. Not that he really remembers much of it...

Mikey's eyes softly open. Light shines in. His whole family is here. Casey is here. Everyone is watching over him. When did they all get here? Where has Mikey been in this absence of consciousness?

Uggh, he feels awful.

Leo comes into view.

"Heyyyyyy, mi hermano. Can you hear me?"

Mikey nods weakly. At least, he thinks he does. He still can't sense much. The feeling comes in slowly, soft prickling and paresthesia. The first thing he feels is extreme heat and shaking. He's shivering. Still? But it's so hot...

Hot... but... he likes the warmth... so why is this unbearable?

Mikey moans again. His head is swimming. His breathing heavy, it's hard to get the air into his lungs. Mikey squirms, sweat breaking out across his brow and under his arms as he shakes.

"Mmnghh... Mikey no... feel... good..."

Leo presses the back of his hand against Mikey's head. It's not cold, but against the feverish heat emanating from Mikey, it's heavenly chilled. Leo winces, his brow furrows in concern.

"You're burning up... Dad, when you broke into Dee's lab, did you touch Mikey? Do you think you might have infected him?"

Splinter's eyes widen as he realizes.

"Oh... I think I might have..."

"So, is Mikey sick now?" Raph asks. "He's got rat flu, too?"

"Why is it just hitting him now, when he was infected hours ago?" Casey asks.

Hours...? Mikey's been a ghost for hours...?

"I'm guessing the brumation put Mikey's body into a sort of stasis. All body functions stopped until he thawed out," Donnie explains. "Brumation causes reptile like turtles, snakes, and lizards (all of which Mikey has the DNA of) to go into a sort of hibernation when it gets too cold. They slow down to an extreme, and might even stop breathing, but they won't die."

Mikey writhes on the bed. His tail thrashes, almost whipping Leo in the leg. Whatever is happening to him now, whether it's a side effect of brumation or whatever fever he caught from Splinter, he hates it.

Leo watches Mikey in concern.

"So, uh... no problem, no issue. We'll just take care of him while he gets over rat flu..."

"But who's gonna take care of him?" Raph asks.

"Uh...Donnie's the only one who got infected this year, and he already went through the symptoms, so he should be immune now..." Leo looks over to his twin. "Do you think you could play nursemaid?"

"You mean take over your job?" he asks snidely. "Of course. I mean, I've already lost a lot of work time on the anti-mutagen, so I might as well..."

Donnie sighs with exasperation as he taps his wrist tech, creating a checklist for the seven stages and supplies he'll need.

"Okay... so this will be interesting to see unfold. Stage 1 is fever, but Mikey's reaction to the low temperatures prohibits anything cold coming into contact with him. Any suggestions, Leo?"

"Give him lots of water, and ibuprofen. We can try to bring down his fever with warmer waters, but I'm not sure if that would help..."

"Copy that. Next stage is wild rat man... or in this case, wild Mikey. That should be fun," Donnie says, the last sentence a soft grumbling whisper. "With Mikey's animal instincts, everyone needs to be on alert. We don't know how he'll react..."

As Donnie continues to explain the seven stages again, Mikey lets himself crumble into a short-lived sleep while he waits for the rest of his body to wake up.

Stage 1: FEVER

Mikey hates this.

Every part of him aches, a dull but everlasting ache. He is constantly shifting between the heat of the sun and below freezing.

He can never get comfortable, he keeps kicking the blankets off as his fever causes delirium and slight nausea.

Donnie does what he can, having him drink as much water as possible while dabbing his face with a wet cloth. But it's all too cold, even if it's lukewarm. Against the burning inferno of his fever, it's practically glacial.

Mikey weeps at the torment his body is putting itself through. Donnie works in silence until Mikey makes some sort of rambling beg for him to talk so he knows that he's still in the room. Between the aches and the delerium, he can't always tell...

Donnie talks about his latest tech design. He talks about S.H.E.L.L.D.O.N.2.0 and the upgrades he made in Mikey's absence. He talks about some of the studies he's been making into genetic mutations and modifications to the DNA and... he sounds upset. He stops talking about that and moves on to a new subject. He talks about botany or something.

Mikey groans in agony and mumbles something... not even he knows what he's saying... Donnie presses his hand to Mikey's sweat-soaked head. He grimaces at the wetness, but sighs with relief.

"I think your fever is starting to break... that's a good sign--"

"Gggggggrrrhhhh..."

"...Mikey?"

Mikey's eyes squeeze shut as he groans, grumbles, growls...

His eyes snap open, the pupils shrink into thin lines that immediately lock onto Donnie. He snarls, his teeth elongating into sharp fangs.

"...Oh banana pancakes," Donnie says flatly as he starts to get up.

Stage 2: FERAL MIKEY.

Leo and Raph are eating lunch with casey, having ordered a pizza and subs due to the day's earlier havoc. Leo plays with the pineapple and ham toppings as he frets over Mikey.

"Dude," Raph scolds, pointing at the slice going cold. "Just eat it already, or put it back in the box."

"Do you think he's doing okay?" Leo asks. "I mean, I know it's only a flu, but after everything that's happened to him already, I'm just worried what this will do to him, I mean, we have no idea how shot his immune system is already from his captivity and malnutrition, and then coupled with the mutations--"

"Leo," Raph says in between bites of his footlong. "You need to chill. I'm freaking out too, but that's not going to do any good. Donnie's got this for now, if he needs any help then he'll let us know--"

"HELP!!"

"...I think he just let us know."

The trio run out to find Dee being chased by a wild Mikey, his tail spiked and quills raised, his eyes glowing bright yellow with blood red as he chases after Donnie, snarling all along the way. Mikey slithers up the walls and ceiling, perching above them all, his head and neck twisting around as he watches them somewhat creepily.

"Oh dang," Leo says, pointing. "That's terrifying. I'm not alone on this, right? That's some 'The Ring' bone-cracking-bending-in-odd-ways type of scary?"

"Not the time, Nardo," Donnie grumbles.

"What's 'The Ring'?" Casey asks.

Mikey snarls loudly, analyzing who to attack first. His eyes stop on Raph and his sandwich.

"Uh-oh," the eldest whispers.

Mikey jumps down from the ceiling, roaring as he pounces down at his brothers. Raph shrieks in terror as he throws the sandwich at his feral brother. Mikey grabs the sub in his mouth and starts to attack it viciously, ripping it apart with his teeth and fangs, shaking it all around as he kills it dead.

"Uh, we start running now, right?" Casey asks.

"Yes. We run now."

The four make a mad dash down the hall, running into the garage and locking the door behind them.

"That... that was terrifying," Leo gasps. "I didn't know he could be that scary... was he like that when you found him?"

Leo turns to look at Raph and Donnie, who pant as they lean against the shell hogs for balance.

"Uh... more or less," Raph admits. "He was lucid when I found him, but once the other experiments were released he went kinda savage and attacked them to protect me."

"He also bit you."

Raph rubs over the spot on his wrist that Mikey punctured. It's healing fast, thanks to Draxum's genetic-whatever-he-did-to-them when they were babies. But the thought of Mikey's face when he came to and saw what he'd done... that hurt much more than any bite.

He hopes to pizza supreme that Mikey won't remember anything from the fever... poor kid probably couldn't handle it...

There's a pounding against the door.

"Agh!" Leo jumps as the loud noise echoes through the garage. "Don't let him in! The door's going to hold, right?"

"But of course!" Donnie says with a nervous chuckle. "I restructured everything after the invasion. Not even a krang could break down that door. The only thing that could get it open is --"

'Hamato Family Override Accepted,' a computer voice sounds.

"...is if someone with the code unlocks the door," Donnie moans.

The doors open slowly, revealing Splinter, standing in the doorway with an irritated expression on his face.

"Boys," he says in his scolding voice. "would you care to explain to me why you left your brother in the state he's in?"

"We had to!" Leo says, hiding behind Raph. "He was going to rip off an arm or something!"

"What are you talking about?" Splinter asks, stepping aside to reveal a very flushed Mikey with a sad expression on his face, eyes wet and pupils so wide they engulf the majority of his eyes.

Mikey sees his brothers and starts crying with joy as he rushes towards them, sloppily landing on Raph's feet and hugging his legs tightly.

"Rrrrraaaaappphiiieee!" he sings, rubbing his cheek against his big brother's ankles. "Miiikeeeeyyyy loveesss youuu..."

Stage 3: CAPTAIN CUDDLECAKES

Raph stares down in shock, frozen still for fear of what else Mikey might do. But Mikey just looks up and him with grabby hands as he cries for affection.

"Pickkkk me uuuup, Raphhiieee.... hold me, please, Raaaaaaphhie..."

"Uh... okay..." he says with hesitance, kneeling down and gently tucking his hands under Mikey's arms as he hoists him up.

Mikey's body is limp like a noodle, swaying back and forth as Raph holds him at arm's length. Mikey's face is bright red from fever, his smile dopey, his eyes half-opened and unfocused, his head lolls rom side to side. He giggles lazily, holding onto Raph's hands and slowly pulling himself closer to him, sort of crawling-slash-climbing across his arms to get to his chest.

"Raaaaaphieee.... I love Raphie... I loves him sooooooo muchesss..."

"Is... is he okay?" Leo asks, a quick giggle escaping him.

"Delirium," Donnie says knowingly with a nod. "He's delirious."

"Are you sure?" Casey asks.

"I'm an ice cream kitty," Mikey says dopily, giggling as he wraps himself over Raph's shoulders. "I'm a cat called Klunk..."

"Pretty sure," Donnie answers flatly.

"He's really cuddly," Raph chuckles, rubbing his hand over Mikey's burning head.

Mikey hums with contentment as he continues to wrap under Raphael's chin, back over the shoulders, and around his neck again...

"Uh, Mikey?" Raph gasps, as Mikey's torso and tail starting to tighten around his throat and choke him. "Mike-- that's too tight, buddy -- Mikey -- gack!!"

Donnie and Leo rush forward and try to loosen Mikey from around his brother. Mikey whines at them, tiredly slapping them away as he nuzzles Raph's face, which is starting to turn blue.

"Boa instincts," Donnie diagnoses as he tries to get Mikey to let go. "Come on, Michael, let go, let go, let -- nggh -- go!"

"Stahp pullin'!" Raph chokes out. "Gettin' tight--!"

"He won't release!" Donnie grumbles. "I don't think he understands what he's doing! It's his animal traits taking over..."

Leo's eyes brighten as he gets an idea. He starts scritching and scratching around Mikey's neck, looking for a specific spot. Mikey starts to giggle, shoulders hunching up and tail loosening. Leo gets to a spot just under the jaw on his right side and scratches. Mikey's eyes pop as he falls into Leo's hold with a mad cackle, legs kicking as he jerks back and forth from giggles. Raph gasps for air and collapses to his knees as he clutches his throat.

Mikey wiggles out of Leo's hold and onto the floor as he continues to laugh himself silly from the special spot Leo found.

"H-how... cough cough... how'd ya know that would work?" Raph hacks.

"I didn't," Leo confesses with a shrug. "I thought he'd faint like in 'How To Train Your Dragon' or something."

Mikey's laughter starts to calm, and he relaxes against the floor, deep sighs of relief as his brothers talk over him.

"I think it's safe to assume that his flu is causing his animal attributes to take over," Donnie informs. "Which isn't good news for the next stage..."

Stage 4: NINJA HUNTER SUPREME

"It's okay," Casey says, trying to calm the room. "I-I'm sure it will be fine, all we have to do is keep an eye on him aaaaaand we lost him," he groans, looking down to where Mikey had been a second ago.

"Alright, nobody panic! We're fine, we're fine, we're--"

"Achoo!" Raph sneezes.

"Welp, Raph's infected now, we need to quarantine him," Donnie groans. "Who could have seen this coming, he said sarcastically."

"I'm okay, I can just -- Achooie!"

"Yeah no," Leo scolds as he helps lead Raph to the door. "You're getting into bed. We're all sticking together too, so everyone be on the lookout for you-know-who..."

The group slowly but surely trudge towards the traincars on the other side of the lair, stopping at every doorway to inspect the rooms for Mikey. He's nowhere to be seen... and that's terrifying.

Just before they get to Raph's room, Donnie's wrist tech beeps at him. One of the motion sensors has gone off.

"Wait a sec," Donnie whispers, tapping the security footage. "I think Mikey might be in the sewer tunnels..."

"What?" Leo whispers back. "Why would he go all the way out there?"

"I'm not sure, but if he gets lost --"

"I'll go after him," Leo answers. "You guys watch Raph and help quarantine him for now before the fever sets in too bad."

Leon grabs his swords and runs to the exits. Casey watches him nervously as he helps Donnie maneuver the former leader into his bedroom as the fever starts to take effect.

As soon as Leo gets to the tunnels, he gets the eerie feeling he's being watched. He's not sure where the sensation is coming from, but three years of being a ninja vigilante and 16 years of living in secrecy under the surface of the greatest city ever has trained him to hone in on these gut feelings and sixth senses. There is someone... or something watching him.

It's unnerving.

He steps into the tunnels and looks both ways. No sign of Mikey. He takes out his comm and leans into the speaker to whisper.

"Hey Don, which way did he go?"

"*Krrsh* I don't know, I didn't see on the recording. I just saw a notif that something set off the perimeter alert. Over. *Krsh*"

Leo doesn't like this. Maybe Mikey never actually left the lair. Maybe this was all... a trap.

Leo's ninja senses tell him to be careful. He turns around quickly and looks up. Mikey is staring down at him from the ceiling.

He drops down like a spider, crashing down onto Leo, who shouts in terror as he opens a portal just beneath his feet. The two fall through, one after the other. Leo portals them back to the traincars, shouting for backup as he runs away while Mikey regains his footing and inspects the new area.

"FOUND HIM! I FOUND HIM! HELP!"

Casey and Donnie jump into the hall quickly, brandishing weapons on instinct.

Leo frantically scrapes his katanas across the floor as he runs away, creating a series of portals that surround Mikey. The feral mutant boy falls through one and pops out in a random place, three other portals boxing him in.

"There," Leon pants. "That should keep him busy for now..."

Mikey sniffs one of the portals, and his eyes widen. He steps through, following his nose and navigating perfectly through each portal, gaining speed with every step until he arrives from behind the trapped trio.

"Or not..." Leo swallows.

Mikey growls, licking his teeth as he stalks them, getting ready to leap in three... two... one...

Mikey pounces on Leo, gripping the handle of one katana between his set jaws and yanking it out of Leo's grip. He clutches onto his brother's shoulders, pinning him down as he tries to rip the second sword away.

"AAGH!!!" Leo screams, kicking wildly as Mikey snarls and drools all over him and his weapon. "GET IT OFF! GET THIS THING OFF OF ME--!!"

Donnie activates his hover-shell and directs it to attach to Mikey, lifting him up and carrying him away. But Mikey still clings tightly to Leo, who is struggling against his brother's death grip on his shoulders. Mikey's nails dig in tight, making Leo cry out in pain.

Casey jumps up and catches on Leo's feet, pulling him loose from Mikey's hold. Mikey is flown away, screeching in anger as the hover-shell turns a corner and disappears with its passenger.

"Sensei-- Leo, are you okay?" Casey asks, eyeing the claw marks with concern.

"I-I'm f-fine," Leo manages, his breath shaky and eyes wide but lost. "I... I'll be okay... I... achoo!"

"Welp, we've lost another brother," Donnie sighs as he carries Leo to his room. "I estimate that we have at least five more minutes before Mikey comes back in a new stage. Casey, you go to my lab and lock yourself in there. Reboot the security system and put the whole lair on a lockdown. We can't risk Mikey escaping, got it?"

Casey nods nervously before rushing away.

Donnie helps Leo get into bed as the fever already starts to set in.

"H-he... he really got me, huh...? Woof, why is it so hot in here???" Leo mumbles as he topples into the bed. "Why is the room spinning so much?? I don't remember booking tickets to the tilt-n'-whirl..."

"I'll get the fan going for you," Donnie mutters.

"I... I feel bad..."

"You'll feel better in a minute--"

"I called him a thing."

Donnie pauses as he looks back at Leo, who's starting to cry softly as he hugs his pillow.

"I was just scared. I'd never seen him so angry or vicious. Not even against the krang... he looked like he really was gonna kill me..."

"He wouldn't," Donnie reassures him flatly. "Mikey would never do that."

"Do you think he hates me now?" Leo whimpers. "Do you think he heard me? He'll remember that? I don't actually think of him like that, I... I don't think he's a monster, I don't... gawd, why is it so hot in here?!"

Donnie rolls his eyes as he plugs in the high-speed fan and aims it at Leo. He sighs with relief from the cold winds blowing in his face.

"We can talk about it later. Right now I have to find Mikey."

Leo hums as he falls asleep on the bed.

Donnie runs back out, closes the door to the traincar, and rounds the corner into the hallway beyond... where he finds the smashed remains of his hover-shell, and no Mikey.

Fantastic.

Stage 5: KARAOKE LOVE SONGS

Donnie can hear Mikey singing loudly. But not in English. He's howling and yowling and chirping some incoherent animal gibberish in the TV room. Splinter probably left one of his old romance soap operas on, and somebody must've busted out into a love ballad.

Donine steps closer to watch him and surveil. The noise could damage his ears with how loud and high-pitched it gets, but at least Mikey's pacified. For the moment.

Donnie messages Casey from his wrist tech; he doesn't expect that he could hear him if he tried the comms.

D: HOW'S IT GOING IN THERE?

CJ: PRETTY GOOD. ALL EXITS SECURED.

D: GREAT. MIKEY IS... SINGING (QUESTION MARK?)

CJ: LOL DOES IT SOUND THAT BAD?

D: I WOULDN'T KNOW, MY HEARING IS PERMANENTLY DAMAGED NOW.

Dee turns back to smile at Mikey, who's howling has softened and slowed to simple hums. He scratches behind his ears with his foot before getting up and dizzily trotting back to his traincar bedroom. Donnie follows from behind, staying quiet as he can. He's not sure what the next stage will do to Mikey's animal brain...

Michelangelo starts looking around his room, coughing every once in a while and sneezing on occasion before finding a large roll of paper that April dropped off some time ago. Mikey knocks it down and rolls it out, carefully setting the paints out as well. That's when he sees Donnie.

He smiles weakly and ushers him in with a soft yawn turned cough.

Donnie walks in and sits beside his brother, helping to open the jars as Mikey starts to draw images...

Stage 6: STORYTIME

Stage six is fanfiction, Donnie knows this. But for some reason, Mikey isn't making fanart or comics of his favourite characters. Donnie wonders why... he maybe doesn't recall them...? He only just remembered Lou Jitsu a few days ago, so it's not out of the question. Donnie's stomach turns when he considers that Mikey not remember that their father was Lou Jitsu...

But he's definitely drawing something. His hands still shake, and he tears the paper every other stroke, but he's making a story to tell with his art. Mikey uses his tail as a paintbrush, gentle but sloppy strokes. It's easier than finger-painting with claws. Donnie sees images of a green thing with yellow spots in a cage... needles and crude doodles of knives and pink monsters... humans in white that kick and hit and zap and freeze the poor green and yellow figure... It doesn't take long for Donnie to realize what story he's telling.

The poor green and yellow thing is crying in his cage. It almost looks like... he's waiting for something...

Then Donnie sees a purple figure. A blue one. Red.

It's them.

But Mikey omits an orange companion. Donnie points this out.

"Why didn't you draw yourself?" he asks.

Mikey looks up at him with concern, and for a moment he's worried he broke Mikey's oh-so-sensitive concentration. But instead he shakily dips his tail in the orange paint and... stalls...

The paint drips onto the paper while they wait for Mikey to make his artwork. But he doesn't.

"Do you... need some help?"

Mikey nods with a sniffle. Dee chalks that up to a runny and stuffy nose. Same with the gloopy eyes that hold tears in them, that's just some kind of irritation or fever. Not the other, more difficult thing -- emotions.

Donnie reaches over and takes his brother's tail, helping Mikey draw a stick figure with round cheeks and a mask with a bow. Mikey leans down to stare at the drawing, analyzing it with astonishment.

Why does he look at it like that? Why is he so surprised by his own image? Why doesn't he... recognize...

Mikey's eyes glaze over, as he slowly sits back up and exhales. Mikey's vision is far away, lost in thought.

Stage 7: MUST SAY YES

Donnie waves a hand in front of Mikey's face. No reaction. Donnie sighs.

"Mikey?"

Mikey turns his head to look at Donnie with a quiet mew.

"I know you'll say 'yes' to anything I ask for. So, I want you to..."

He wants Mikey to tell him why he didn't draw himself. Why he reacts the way he does when they leave him alone. Why he is so scared of Casey and April, why he didn't remember their names or Lou Jitsu or anything. Why he has a voice in his head, and what the voice tells him. He wants to ask for him to get better and get back to normal as quickly as possible. He wants to ask him to be his same old Mikey self again.

Donnie sighs.

"...I want you to get some rest and heal up. Okay, buddy?"

Mikey gives a weak smile before closing his eyes and flopping against Dee's chest, wheezing with each breath he makes. Donnie rolls his eyes and lifts his congested baby brother up into the hammock bed, tucking him in and making sure that he's nice and warm.

He steps out of the traincar after turning off the lights. He's utterly spent, he might try taking a nap too...

Until Casey runs up to him, a worried expression on his face.

"Donatello! Donatello!"

"Shh!" he shushes quickly, signing that Mikey is fast asleep and resting. "What is it?"

"I was reviewing security footage in the labs, and saw that Mikey never went outside the tunnels..."

"What? But the sensors --"

"Sensed something, yeah, so I went back and looked for what it was. I found this hiding outside the entrance to the lair," he says, reaching into one of his fanny packs.

Casey pulls out a mediocre miniature drone, complete with camera and microphone. The device is no better than scrap metal now, having been partially destroyed by Casey's weaponized hockey stick.

"It may have taken me by surprise..."

Donnie stares down at it. There's a small logo printed on the side with the initials EPF.

"...How long has it been here?"

"We got the alert around... maybe fifteen minutes ago?"

"Are there any more?" Dee asks, his tone low and frightfully serious.

"I don't know," Casey answers. "But I can do a perimeter sweep."

"Good idea," Donnie says, rushing away. "I'm going to create an invisible fence around the lair that knocks out any unrecognized tech. Then, I'm going to see how damaged this scrapheap is. If the receptor and signal output are still intact... maybe I can find out what our friends at the EPF are up to."

Dr. Timothy stares down at the wretched mutated human in a cage, wearing a torn and tattered uniform.

What a disgusting failure.

His face is misshapen and bearing three eyes, his arms (one of which is scarred from talon gashes and bite marks) are covered in fur, his hands are like bear claws and his feet are webbed. He is an amalgamation of random things, and now he's in the cage that belonged previously to 'Mikey'.

Timothy scowls at the mutation. It was a wild test, anyways. Nothing important. Just to see what would happen... Honestly, it was more as a punishment for damaging Mikey's brain than an actual scientific pursuit. And it's not like anyone will miss him; he was nothing important, anyways...

Nothing is important. Nothing matters now. Nothing but finding that one experiment again. The only successful mutation... Mikey.

The man in the cage whines at Dr. Timothy. He cannot speak anymore. Nothing more than a dumb animal. Which, from the intelligence he showed before mutation, is quite possibly an improvement.

Timothy kicks the cage in frustration. The man yipes and backs away, whinging like a dog.

What to do, what to do...

None of the mutations have worked right. None of them show any signs of increased intelligence. It seems the opposite, their minds decrease and their problem-solving skills evaporate. The physical toll on their bodies is heavy, and some never even survive the first round of mutation. None of them can take orders. None of them can fight with complexity and agility. None of them can be trained. None of them can understand basic commands or words or anything of the English language, or any language. They're all just stupid, dumb animals! None of them have had the success rate that Mikey did. Why? What about him was so special??

He was already mutated...

There are a handful of mutated freaks out there now, running amok and wreaking havoc. How were they changed? Why has it worked with them? What could have possibly done it for them, and why can't they recreate this phenomenon?!

Dr. Timothy has always been interested in mutations and enhancements. This reason is why he joined the science division of the EPF. He knows most of the scientists here are working to save the alien-infected citizens. And Tim is all for that! Why not help humanity? But why stop at simple cures, why not go bigger? There are some freaks running amok in the streets, a result of odd glowing bugs released upon the masses almost three years ago. These mutations have made the humans stronger, faster, better. They can withstand almost anything! They are practically indestructible! These idiots think that saving humanity means eradicating the mutants. They couldn't be more wrong.

It's the humans who need to be... shall we say, updated?

What a weak and pathetic species. Slow, soft, squishy and easily injured. Bruisable. Breakable. Like putty.

But add some extra features and a killer instinct... and you've got yourselves a prime class of creatures that can stand tall for centuries!

Why not be better? Why not be stronger?! Why can't they see that?!

Timothy wrings his hands through his hair, growling at the unfairness of the situation. If only he could get his hands on that mutie again... if only he could have Mikey back.

That is the only thing that matters to him now.

Getting that mutant turtle back.

It's all he thinks about. The good news is that they've sent spy drones into the tunnels and seem to have gotten some interesting footage before mysteriously going dead... Timothy is having another wave sent in within the next three days, max.

The others may have seen his passion for the science, but this is different. This is mania. This is an obsession...

Timothy will do whatever it takes to get that mutant turtle back into his possession, and figure out how he survived the mutations.

And then...

He will become the better man. The better, more dominant species.

The better mutant.

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