TMNT Oneshots/Scenarios

The Coldest Heart(Yandere Future Rise Donatello x Reader)

CW: Apocalypse, kidnapping, freezing, dark themes, yandere themes

Winters were always frigid in the apocalypse, the broken terrain and weather making the places that have never seen a snowflake now completely frozen over. The "snow" that covered the barren wasteland outside the base's doors was a poisonous brown, bubbling when it touched the ground instead of sticking. It may be frozen, but it was nothing like the fluffy white snow you held dear in your memories. You shiver under the blankets you were given, your body curled up in a weak attempt to preserve the heat trapped under the blankets with you. You were exhausted, sleep pulling at your eyes and trying to coax you under, but the cold biting at your fingers and toes was unrelenting. Your ears and nose burned, keeping you alert as you try to keep out the frigid air. The small amount of heat Donnie allowed in his lab was gone, the furnace broken and vents turned off. Cold had seeped into every crack and was now trying its best to choke you out as well.

You turn your head towards Donnie as he types onto a monitor projected by his ninpo, sticking your face into the bitter cold. His outfit amazed you, the mutant only being dressed in a thin sweater made to stretch over his battle shell and sweats that were a size too small. You look at him in envy, not understanding how he could withstand the freezing temperature in the thin clothing he had. Donnie turns his head at the feeling of your boring gaze, his eyes meeting yours and his tridactyl hands leaving his keyboard which causes it to falter, then disappear. For the first time in the months since he had stuck you in his lab in claims of protecting you, you don't break your gaze. Whether it was from exhaustion or the cold, you no longer cared about such a simple thing as keeping your eyes off the man you hated most. If he was truly upset with your staring, he could come and close your eyes himself.

"You're shivering." Donnie muses, his voice teasing and airy as if the frostbite creeping over your nose was a mere tasteless joke. You scowl, burying yourself back into the plethora of blankets that covered the cot Donnie had you share with him. You hear him chuckle at your childish display, driving in the belittled feeling he had sunk into your heart.

"Fix the heat then." You grumble at your captor, not caring for niceties. You can hear his chair shift and you look back at him through a crack in the blankets, seeing his eyes averted downwards as he chews on his cheek. His knuckles are now digging into his teeth, his eyes looking everywhere but you as he seems to be debating himself over something. His shoulders are more hunched, like he was a little kid who got caught stealing cookies late at night.

"You know I can't." Donnie says, like he was trying to be firm but his voice falters. He still refuses to meet your eyes, only staring at the floor as he chews on his knuckles. Your eyes narrow, your knees pulled closer to your chest as another cold burst breaks through the blanket barrier.

"You've already fixed it." You accuse, the chattering of your teeth breaking up the sentence and making it sound more pathetic than you hoped. Donnie finally pulls his fist away from his mouth as he stares back at you, crossing his arms and protesting with a loud, "indignant scoff." If you could feel your feet, you would run over there and strangle him.

"If you're cold," Donnie starts, his voice tight as he dodges your accusation to try and quell your thoughts, but ends up confirming it instead. "You can grab a blanket and come sit with me. I'll keep you warm."

You sneer, diving back under the blanket den you had created around yourself. Even if you wanted to cuddle up to the person who was holding you hostage in the name of 'safety', you couldn't. Your feet were so frozen you couldn't feel them more than a dull pain, and your fingers couldn't close around the thin material of the blankets anymore. Silence stretches through the lab, and you're sure Donnie had given up and turned back around.

A quick padding of socked feet breaks the silence and two arms wrap around your covered self, lifting you from the cot and into Donnie's arms. He mumbles a swift apology as you flail and curse, quickly moving back to his chair and depositing you in his lap. He shifts the blankets around, helping you pop your head out so you could see. Donnie cups your cheek with one hand, the other still firm around your lower back so you couldn't squirm away from him and escape. The feeling of his hand on your face is one you always hated, but the burning head of his warmth makes you hiss in pain rather than disgust. He was an oven, his hand slowly heating your cheeks and bringing color back to your face. You melt into him after a minute, nearly crying when his warm hand leaves your cheek to cup your ears.

"You are cold." He mutters, mostly to himself. He continues to try and warm you himself for a small while, attempting to bring your body temperature up from the dangerous levels it had fallen to. He eventually signs and gives up, summoning a projected screen with numerous switches and buttons. He clicks a few things before closing the screen and pulling you closer, easing open the blankets you clung to so he could pull your whole body against him and try to warm you up.

You hear the vents above slowly whirr to life, the room slowly being filled with a strong heat that makes your head spin. You blink at Donnie, your limbs unstiffening as you try not to cry.

"You fixed it..." You mumble, letting your head hit the dull point of his plastron. Donnie nods, rubbing your back beneath the blankets. Anger pools in your chest for only a moment, the relief of the heat taking over and the exhaustion pushing through once more.

"I fixed it within minutes of its breaking. I wasn't going to let the base freeze." Donnie pulls you closer, kissing your temple with a smug smile. "You, however, weren't letting me touch you, so I turned off the heat to try and convince you to let me touch you more, but that seems to have backfired."

You scowl, hitting his shoulder with your forehead. You wanted to scream, to bite him, to do anything to make him suffer like he had you for the past few days, but you don't. You were terrified he would turn the heat back off. His lab was obviously able to be isolated from the other parts of the base, which horrified you. For all you knew, he could leave and seal the doors before shutting the oxygen off for a couple minutes, just to let you suffer.

Donnie continues to rub your back, his quiet humming not showing any bit of remorse for the torment he had put you through. He seemed happy with the outcome, and you figured he was. Here you were in his arms, just as he wanted. Maybe once you could feel your fingers again, you'd try and fight him, but for now, you had given up. The heat was too much of a reward for you to risk losing it now. Even Donnie's arms were a price you were willing to pay to not freeze. His plan had worked, and now nothing would stop him from doing it again.

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Words: 1291

Posted: 11.17.23

A/N, not important: Any criticism is welcome, constructive or not. This is supposed to be a gender neutral reader, so if I screwed up somewhere, please tell me.