Chapter Text
Donatello was a smart kid, he was the designated mad scientist, he made robots built with military grade arsenals, chemicals capable of rendering people to giant pimples, and could even recite the entire elemental chart in his sleep. But that doesn't mean he wasn’t also a complete moron.
So when Donnie meets Casey for the first time after he follows his brother home after supposedly getting his butt kicked by said brother. and April tells the whole group that she not only knows the human, but he’s also her BOYFRIEND? Well, technically she didn’t say that, the mangey, rabies infested thing called Casey Arnold Jones Jr did. It made Donnie’s blood broil, because not only was his best friend secretly dating someone but he was some total idiot! A complete and utter fool who ran into fights like he was actively trying to die! Sure he was handy with a wrench and a fun sparring partner, but was he really the person that April wanted to be with? As April's best friend out of everybody in the whole world, it was completely and totally up to Donnie to make sure Casey got his act together for his girlfriend. And the only way to do this completely necessary job, was to watch Casey’s every move without April’s knowledge, and use his careful monitoring to keep the human from even thinking about hurting April. It was a completely foolproof plan with no repercussions.
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When April came to Casey with a proposal to fake dating, he agreed immediately. He was cool with it cause he got to hang out with his closest friend and go out shopping and on lunch dates where he and April would gossip their hearts out. April was no longer pestered by weird guys who couldn’t take no for an answer, and he had someone who would actually listen to his gay rants without feeling like he was crossing a line. It was a win/win situation, an equal exchange, gay solidarity if you will. A pact between friends who were looking out for each other.
Casey was under the impression that he was aware of all April’s secrets. So when he followed a five foot tall, mutant turtle back to his home underground, and then found out that April knew these guys, and had known them for at least a couple months now. He was very thrown off. And not only that, but these dudes were fighting alien guys that were trying to kidnap April for some weird sci-fi world domination plot? It was a lot to handle, but he did his best to get along with this family that protected April when he couldn’t. He joined their patrols, practiced in their dojo (seriously they were ninjas too???), and spent all his free time with them. Not cause he didn’t have other friends (he doesn’t), but he just enjoyed the energy. As much as he loved his dad and Angel, it was hard finding people with the same unabashed fighting spirit he had. Raphael and him were besties of course, they sparred often and liked all the same bands and listened to music and ranted on their little outings. Mikey was his number one party animal who he liked drawing with. Leo and him liked to geek out over comics and movie plots together. He even liked spending time with Master Splinter (he totally wasn’t afraid of rats anymore.) He got along with the whole family, except one.
Donatello, AKA the rudest, bitchiest, nerd he ever has the displeasure of being around. Seriously, the dude would never talk to him unless it was an insult. He also stared at him when he was with April. Like, wayyyy too much. Like seriously, dude, she doesn’t like you like that. He even explained that April was his (albeit fake) girlfriend but it only made it worse. No matter how much he tried to get the little shit to back off, it was like he took it as a challenge. Sometimes he swears he even sees the turtle following him around the lair. It was creepy, honestly if he knew any better the turtle was planning his murder. He wishes he was wrong but the piece of paper in his hands was all the proof he needed. How did he acquire this paper? Well…
He was just so bored in the lair, Raph and Leo were sparring, Mikey was cooking, Master Splinter was watching over them, and April was taking some much needed nap time. He was too tired to spar but too wired to sleep (ah the joys of adhd). So he decided the best course of action was to go and bother his favorite nerd. He didn’t especially like the turtle but he found a special kind of fun in pushing his buttons. It always ended in lab equipment being thrown at Casey as he cackled and ran out the lab. He made quick work stalking to the lab, making use of his ninja training and blending into the shadows (he was totally awesome at it too!). The closer he got to the lab the clearer he could hear Donnie’s voice as he talked to himself.
(What a weirdo) Casey thought to himself, adamantly ignoring how he does the exact same thing. Casey stepped back and raised leg, bracing himself on the wall next to him and- BAMN!
He had kicked open the door and stepped into the lab with a loud and cheery
“HELLO DONNIE!!”
Said turtle had startled so bad he fell out of his chair, he held a paper taut in his grasp before crumpling it into a ball. His brows furrowed as he turned to look at the offending human.
“Hello Arnold Casey Jones Jr, to what do I owe the displeasure?” He said eerily calmly. His eyes twitched while facing the human. Clearly he was trying to look threatening but it wasn’t working because he was still on the floor. Casey huffed a laugh and tried to be nice and offered a hand
“Need any help” he mocked.
Donnie slapped his hand away and pushed himself up with a grumble and strode to throw away the paper ball.
“What do you want Jones”
Casey noted that Donnie was too distracted to notice the paper fall on the floor instead of the trashcan.
“Oh nothing, I just felt like bothering you” he replied coolly. Watching as Donnie sped through the 7 stages of grief before replying
“Well I’m busy working right now, so screw off Jones.” (God what a buzzkill) Right? Like would it kill him to entertain a poor Casey Jones?
Casey snarked back,
“Well watcha working on Donnie-boy” and Oh ho ho! That got the terrapin all hot and bothered.
“Don’t call me that!”
“Ok what about Don-tron?”
“No-”
“Diddly-Don!”
“Hell no-”
“Dee Di Doh Dumb!” (that took some brainpower)
“That's not even a real name!”
“Ohhh I got one!” Casey shouted triumphantly. He buzzed with excitement as the turtle squeezed his nose bridge like he was fighting off a head-ache. His other hand held up in a “Stop” motion.
“Casey you rabies infected beast, don’t you dare say another stupid name or I swear to god-”
“Ok Ok” Casey held out his hands in mock surrender (Rabies infected?).
“Whatever you say my dear Tello Fellow-”
He felt the air knock out his lungs as he was thrown to the concrete floor. He questioned his life as Donnie straddled him and gripped on to his hoodie collar roughly. The worn cotton dug into his neck and Casey briefly wondered if he should fear for his life (This would be the dumbest way to die I think.) Donnie glowered down at the human in his grasp and growled.
“Jones, you may be our ally but that does not mean I won’t tear you a new one if you don’t get the hell out of my lab” His face was almost entirely covered in shadows, his eyes were piercing white as they stared into Casey’s soul (god that’s so freaking cool.) And yep he should totally be afraid. Too bad Casey Jones doesn’t get scared. He gripped hard on Donnie’s wrist and pulled himself up to look the turtle in the eyes.
“You don’t scare me, so don’t even try it.”
Instead of getting punched in the face like he expected, Donnie let go of Casey and let him stay on the ground, before getting up and going to sit on his desk. Casey propped himself up on his elbows and was about to voice his confusion before Donnie interrupted him. He sighed loudly,
“Just- just get out of here Casey, I’m too tired to deal with this right now”
(Wow ok… that’s just rude man)
Just as he was (reluctantly) getting up to leave Casey spotted the paper ball on the floor next to him. He looked back at the turtle before subtly taking the ball and shuffled out of the room.
*・゜・*:.。.*.。.:*・☆・゜・*:.。.*.。.:*・☆・゜・*:.。.*.。.:*・☆・゜・*:.。.:*・☆・゜・*:.。.*.。.:*・゜・*
He took a breath of air once out of the lab before looking down at the ball clutched in his hand. As he walked to the living room he uncrumpled the paper and scanned it. He recognized the nearly illegible writing as Donnie's. Lots of thick lines and color and neatly drawn diagrams (is this a flowchart?) Some of the words were understandable, like the word
“Casey”
It was written in multiple spots on the chart, along with little stick figures that seem to represent him. April's name was also written on there, but it seemed that the paper was focused mostly on him (Creeper…) Casey belatedly realized that there was a lot of information about him on here. He looked at one box labeled “School” which included his schedule and classes (Creeper! Creeper!)
Another box labeled “family” which just had a bunch of question marks. And the most alarming box at the bottom labeled “Plan” which had nothing but a date.
“June 24th 2013”
Which was about two weeks from now. To say the paper was a red flag was an understatement. The human felt a cold chill creep down his spine at the implications of the paper. He was aware that Donnie wasn’t a fan of him, but this? This was frankly terrifying. He fiddled with the drawstring on his hoodie and mentally listed theory after theory of what Donnie could be planning. Maybe it was a surprise party? No, Donnie doesn’t party. Maybe this is Donnie’s way of getting to know Casey! (Pssh like he wouldn’t just ask like a normal person) There was also a possibility of- no.. he wouldn’t.. Right?
Is Donnie planning to kill Casey?
Actually that makes too much sense. Ever since Casey admitted to being April’s (fake) boyfriend, the turtle has been… let’s say harsh. So there is a motive, and there is a plan and oh god it makes too much sense. Donnie is planning murder him. Should he tell someone? No no he can handle this right? Yeah right, Casey Jones who got butt whooped by the Purple Dragons a week ago is totally handle a murderous nearly 6 ft mutant turtle. But the only people he can tell are said turtles family members, and there is a solid chance they are aware of the plan. Casey was thoroughly freaked out at the possibility (wait there is one person) Casey turned to the room of the one person who he could completely trust and made a decision.
He was going to tell someone.