Donny's dark obsessions

by DippyDrop

Summary:

Idk if I'll make more one shots or what-

Chapter 1: Leo's new collar

Summary:

(First time doing TMNT fanfics...)

SPOILER FOR MOVIE

 

Everyone has been giving Leo special gifts and love since he almost died fighting the krang.

Donnie seemed to give him the most attention...

But, Leos just imagining things, right?

CW/
Obsession
Trackers
Possessiveness
Donnie is just really creepy TBH

When he saw his gift, Leo thought his brain was about to short-circuit.

 

His brother might have a hard time understanding things like emotions or social standards- to be fair none of them knew much on THAT front- and everyone had been going through some hard times lately…

 

But, Leo would've thought he'd understand something like... THIS… wasn't normal and might cross some boundaries.

Not to mention the odd Déjà vu he could feel itching up his shell.

 

"Um… Donny-man" he started, his mouth dry and tongue heavy as lead with nervousness he refused to show.

 

That gleeful look was ALSO giving a sense of Déjà, despite the lack of such emotions lately…

 

"Yes, my dear brethren?" He questions, his usual monotone-like voice an octave higher in rare, visible glee. A tone he'd have when showing off his latest tech.

 

"What's….THIS for?" He asked, awkwardly holding the opened box on his lap.

The box itself was a dark night sky gradient of blue-purple hues, It had been neatly wrapped with a bright blue bow, purple hinges along the ends.

 

The Slider's proclaimed twin had decided to barge in his room while the younger of the two was busy with the latest Jupiter Jim comic Mikey gifted him just yesterday. It isn't the first time the two had given him gifts lately.

 

It had been about two or so weeks since the whole 'krang' situation, yet despite the healing of physical pains, the cuts to scars thanks to special healing, it had affected everyone in the family deeper, including how they treated Leo.

 

The changes were no surprise; 

Splinter had been warier in training, and kept a closer eye on them. Mikey wasn't as gleeful as normal, Raph didn't like when his right arm was touched as much, it made him jump. Donnie's anxiety and lack of talking, rarely spoke at all.

 

Mikey hadn't been able to draw as much, his hands jerkier than before, rubbing his arms subconsciously from phantom pains, Square shaped pieces of skin, and even muscle burning from mystic overuse and flaking off in yellow lights. While Don and Raph had similar burns on their hands- Mikey by far had it the worst.

By now what's left are patches of missing scales. That would need more time to recover-

 

If they ever did fully.

 

Raph's eye and head had been bugging him since that day. He had lost some sight in it. It ached in the young leader's heart when the tank of a teddy bear would flinch if something was too close on that side of his face, where he might not see it as well. Knowing it was HIS fault his big brother-…

 

Donnie hadn't slept as much as usual, not that he NORMALLY kept a normal schedule. Paranoia seemed to follow him around. And his wounds from his soft shell being out, then ripped from the control panel.

Not only that, he was ALWAYS with one of the other three. Obsessively making sure they were healing fine and didn't seemingly disappear into thin air. It seems that, despite how physically hurt Raph and Leo were, Donni was hurt the most physiologically.

 

Everyone understood the almost constant supervision, the rebuilding of their home meant MANY upgrades for the SoftShell's anxiety and fear…

 

He was that way with all his brothers…

 

However, it was feeling like Donnie's newfound protectiveness was aimed at Leonardo most.

 

But the slider had pushed that thought away…

 

After all, all three brothers had taken to being extra gentle around Leo.

Gifts, snacks, affection. Even Splinter let him sit in his chair for a day or so.

 

Donnie was just… being extra careful, as everyone else was…

 

But…Now?...

"Nardo?" 

 

His head snapped up, blinking at the still smiling (with that endearing awkward smile, Leo remembers when Don asked for "smiling tips" as a hatchling, something about 'scientific purposes'?) 

 

"You were spacing out, what could be in that head of yours?" Donnie asked. "GASP, Do you not like the color?" His brown eyes widened in sudden horror. "I KNEW I was missing SOMETHI-"

 

"N-no no no-" Leo's voice chipped. Holding his hands up worriedly as the box rested on his lap.

 

"I just-... Why?" He asked slowly, staring down at the object made with such love.

 

The soft wrapping paper is almost magenta pink (he's grown to hate such a color. Those damned aliens.) Gently around the deep royal blue of the… neck piece.

It was shaped differently from last time, which had honestly made Leo think it was originally some sort of shorts or underwear. (Really it was just to cover his whole neck AND some of his chest for an extra SHOCKING factor.)

 

This one had a more classic look, it was still metal (of SOME kind.) And that deep blue, but while it wasn't shaped weird, it was still quite thick, and had an emerald shaped like a turtle with red markings on it. How DONNIE managed to get such a specific gem, he didn't know either.

 

"Here, let me?" Donnie asked instead of answering the blue turtle's question, but something told Leo it wasn't actually a question as Donny plopped beside him on the bed.

 

Leo opened his beak but shut it as the collar was lifted. On the side, it had some sort of screen.

 

Leo felt something was off.

 

Something is wrong.

 

But he trusted his older twin to gently buckle-... No… clasp the collar. As it closed around, Leo noticed it was the perfect size.

 

He wonders how Donnie knew his specific size to where he didn't have to loosen or tighten it. Not that he could as it snapped and made a clicking sound.

 

The soft inside felt that of fur, very soft fur.

 

And despite not seeing directly, he noticed what seemed to be a new light source below his jaw. That pink again.

 

Donnie simply….stared…

 

Leo felt like everything in him was growing with unease, the way those dark brown eyes just STARES at him with some unknown feeling.

 

Leo can't help but lean back on his hands- but before he could, another hand grasped his own.

 

Leo flinched as Donnie held his right hand, those emotionless eyes boring into him, normally it wasn't an issue but-

Something is wrong. Very wrong. 

 

"You need to calm down, dear Brother," Donnie said, Leo swallowed hard… 

 

"What's-... What's the collar for, Dee?" He asked, softer. Donnie tipped his head, as if he was processing Leo's words.

Then once again, his lips split into a smile Leo has never seen, he swore he could see a pink shimmer in those brown eyes.

"Oh, it is just to be sure you're safe." One of those oddly cold hands moved up his arm, to curl around the tech.

 

"After all…" as he leaned closer, every cell told Leo to grab his dual katanas.

Leo isn't safe…

 

He…

 

"Now you'll never leave."

Is in more danger than he was in that other world.

Chapter 2: Emotions

Summary:

Tried and probably failed on Ronnie's perspective-

Donnie doesn't like emotions.

 

They are so…complex.

 

It's hard to know which is harder to understand, other's emotions or his own.

 

Sometimes his brothers overreact, and get controlled by it. And it causes nothing but trouble.

 

Donnie's felt emotion, of course, he has! He's been happy, especially when Leo someone asks about his amazing tech.

Or when he figures out a new algorithm after trial and error.

 

He's felt annoyance too, when Mikey gets too loud in his ear, or when Raph comes up with some idiotic plan. Or when Someone gazes at Leo for too long .

 

He's felt sadness, when his favorite pizza place was destroyed or when Leo was almost-

 

…

 

Donnie feels emotion. But it seems like it isn't the same as his brothers. Mikey is always helping people who, LOGICALLY, don't deserve it. Donnie never really understood why Mikey wished to help Draxum, despite creating them and being quite smart (compared to others around them) the man had caused all of them nothing but harm and pain and almost killed them. Like when he threw his blue masked twin off the building.

But an emotion he hates the most is one he doesn't even understand.

 

He supposed it was a bit of anger, but it feels… Off.

 

Ever since he could remember he's been… Protective.

Which is normal for an older brother of two, Shell knows how protective RAPH gets. But it does seem to think more for Donnie's twin.

 

Leon, the only brother so similar to himself. It's no wonder everyone calls them Twins.

 

It's as if Leon knew how Donnie felt before he knew himself. Despite the bit of bickering they do.

 

Maybe that's why he feels this way.

 

This… scary… feeling. It shines whenever Leon is talking to a Yokai, or even April.

 

It's like an irk, it spreads and grows along his scales, his shell, his brain. Rawring in his eardrums and compelling different scenarios in his head and mind's eye like a plague.

It isn't just anger towards the stranger, but his own twin. He didn't understand why, it must just be the fact it's his precious twin not giving him as much attention and praise he craves.

Or… did until April came waltzing into their home, laughing with Leon and Mikey, who were childishly stomping ahead.

 

Donnie and Raphiel had been sitting at the skateboard ramp, Donnie fixing Sheldon as Raph was doing… something.

 

Donnie only noticed because Leon's voice was laughing.

 

"I TOLD you, Mikey! There's no such thing as 'ghosts', And GUESS who was right!" He gave two finger guns, as Mikey halted to glare back, with that point. Before waddling his way to the oldest turtle, and face plant on his plastron.

 

Donnie barely glanced up, noting how Leon was wiping some sweat off from wherever they ran to.

 

Donnie went to look back down, but caught April placing a hand on his Twin's shell, playfully smirking. "Ok ok, don't ya think that's enough teasing? Poor boy was scared out of his SHELL". Donnie'd brow twitched.

 

" Like YOU can talk, you were laughing and smiling the whole time" Leon claims, leaning back as he waved her soft hand away to place a hand on his hip.

 

April snickers "and YOU screamed like you were about to die, after all that talk about them not being real. I'm surprised your voice WORKS with all that shrieking!" She all but cackles.

 

Donnie felt his lips curl unusually, and before anyone saw, he turned back to his normal expression, and glared down at Sheldon…

 

Or...

 

He thought he did.

 

Until later in his pristine lab, April bargained like she owned the damn place.

And sat right on his workstation, leaning and smirking at Donnie. Donnie's brow twitched.

 

Normally at this time, it's LEON coming in, usually unable to sleep from his insomnia, not his self-proclaimed friend.

 

"Ya know something?" She started after a moment of scowling at each other. Mostly on Donnie's side.

 

Donnie finally lowered his French, crossing his arms in a silent demand for her to continue. What's she even DOING here? Its-

 

Donnie glanced at his arm tech…

 

Almost eleven.

 

He wanted her to say whatever bothersome rambles and leave him be, Leon is-

 

"Leo snuck out," she said. Dommie's eyes snapped up, widening slowly as her grin grew.

 

"... What…" he slowly mumbled. "Where, with who." He was already feeling his knee twitch, he wished to scratch his arm.

That itch.

 

"Something about meeting a friend?" April mumbled, finger to her chin in thought.

"While we were out he said the guy was super cute" 

 

Donnie was already standing at her words, turning to leave. He needs to find Leon. He isn't home where Donnie can watch him or hear if he's hurt.

He doesn't even know where he IS, he could track his phone-

 

Laughter cut his train of thought, and quick footsteps.

 

April was laughing. Like she just said a big JOKE. Donnie doesn't understand.

 

"I was RIGHT!" She said, pointing a fleshy human appendage at him. Donnie can't help noting it's the same fleshy finger that touched Leon…

 

Does Leon like more feminine features?

No, because April just said a male…

What the hell did this crazy human mean? Donnie felt annoyed at realizing he didn't understand A LOT right now.

 

And not knowing where Leon is.

 

But she might. 

 

Donnie felt a weird rumble escape his throat. Stepping closer "where IS he" he mumbled softly. April, still chuckling, waved a hand dismissively.

 

"He's asleep in his room."

 

Anger.

 

"Why would you-!"

 

She dared to cut him off.

"Calm down DonnieBoy, I had no idea how POSSESSIVE you would be, seems quite incestuous." She said, that shut the other up.

Eyes wide with confusion.

Possessive?

He forced her to leave.

After that, a lot of weird feelings were explained.

 

That itch, the anger… 

But he doesn't think about it much.

 

He just has a word for the itch.

 

When the kraang invasion happened, it was like a switch in his brain had been flicked.

 

He isn't sure entirely what set it off… There were so many situations.

 

Maybe it was the weird pink sludge he had to practically become one with.

 

Or…

 

Leon's last words definitely made Donnie understand one thing…

Leon isn't safe without someone keeping an eye on him.

 

He was so RECKLESS. 

 

How DARE he do something SO illogical!

 

Donnie started worrying.

 

What if Leo did it again?

What if he TOSSED himself away again? As if he wasn't so precious, as if it didn't matter if he disappeared.

That haunted him.

 

He either stayed in his lab or visited Leo when he wasn't helping the others' wounds.

Leon needed him most. What if his twin disappeared?

Then, he had an epiphany!

He worked so hard on it.

 

He designed it JUST for his previous twin.

 

His other half.

Now Donnie feels content, seeing the gorgeous ownership clasped around the gorgeous Slider…

Donnie likes this emotion.