Operon (Tomura Shigaraki x Reader)

Chapter 5 *UPDATE Sept 9, 2022* (pt. 1v4)

May be spacing out the chapters differently, I'll update accordingly. I added how the genetics of her abilities work.
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[Later that evening: During Operon's first mission]

With a faint purple glow emanating from your hands, you took a deep breath. The glow lit up your face under the blue fox eared hood you wore. It was just a peon, wasn't it? No one of significance and yet you knew you'd remember this night for the rest of your days.

"Can you take care of this, Operon?" Shigaraki inquired, clad in a black trench coat with all of 'his family' equipped. But, why focus on dismembered hands, when you were the one on the spot right now.

"Tomura, please. Just- give me a minute." You managed to utter, voice strained. You winced as you felt the sharp pain from the knife wound again, in your side.

You heard Shigaraki sigh, as the person beneath your hands began to wail, "Please you don't have to do this! I-I won't tell anyone you were here. I'll stay quiet."

"You won't even stay quiet now, do you think we trust you not to go running back to the yakuza? Do you think that we believe you have any semblance of real resolve." Shigaraki stated, coldly. He cocked his head to the right, before speaking again, white hair falling onto the hand that obscured his face. "You're weak. Trash that will say anything just to stay alive, just the type of swine I hate."

You blinked knowingly, he was right. You couldn't let this peon go. Regardless of what he was saying, if Overhaul learned the League was planning to backstab him, everyone would be at risk. "I know Tomura, I have to kill him."

The feeble man began to weep, "P-please, no. I-I can h-help you."

Shigaraki raised his hand menacingly, you knew all too well what he was implying. However, he chose to hold back, instead speaking down to the yakuza pawn, "You should have realized there would be repercussions for supporting the lowest form of villainy- who could respect a vile gutter dweller like yourself? Weakness is all you are. There's nothing you could offer the League."

Swallowing your indecision and narrowing your (e/c) eyes, you spoke, "If you wanted to help us, you would have been wise to sheath your blade earlier."

You could hear Shigaraki grunt, it was clear he was putting a lot of effort into restraining himself. He stood above you, watching carefully, body tense.

Keeping your eyes posed on the pawn, you continued, "Once you stabbed me, your fate was sealed. Regardless of my decision, Tomura wasn't going to grant you mercy. He's not the most generous person, to those who are unworthy and brash. And you-you are both of those things."

Still weeping, eyes bloodshot, the man wailed, "Mercy! Mercy! I'll do anything."

"Anything? Then you'll let Operon kill you." Shigaraki retorted, holding in a laugh. You had to give him credit, he had a wonderfully twisted sense of humour.

It felt like hours had passed, not the minutes it had actually been since you'd heard the last few words that had been spoken. Despite the banter you could hear between the man and Shigaraki, you could feel the gravity of the situation. "We can't let him go, despite what I might want... Tomura is right. This person- if he goes free I'm in danger, the whole League of Villains is in real danger..." you muttered under your breath, barely making a noise, in an attempt to bolster your bravely before it faulted under the weight of the situation. Looking up slightly to your side, you caught the leader of the Underworld of Japan glancing down at you.

He pulled the hand off of his face, so that both you and the man could see his scars, the true face he always hid, he didn't speak, but you knew he was there as support. No words were spoken, but if the wind could truly embrace you, it was clear that you would feel your Leader's embrace.

You moved your left hand to his neck, resting it gently on his skin just above the collar of his black shirt. As the purple glow radiating from your grip on his neck grew brighter and began to blind the victim, your grip tightened.

Shigaraki grinned, a playful darkness clear in his look.

You met the gaze of his red eyes, as you felt the warmth and tempting embrace of the darkness within you creeping forth. What was this, why did it feel... right?

You could feel a darkness settling in the mist around your body, a pool of your own blood slowly aggregating around your knees where you'd been kneeling on the cold ground. It didn't feel cold. If anything it felt hot, like a fire burning beneath you - not one meant to burn, but perhaps to scald. You shook your head, this was not the time to let the dark drag you under, not that you weren't tempted of course. If you did this out of lust you'd never gain Shigaraki- no Tomura's approval. Taking a deep breath you pushed your feelings aside and ran your hand along the man's neck.

Focusing all your radiant power at him, you willed the ~500 genes to mutate, spreading chaos as P53 stemmed activation of TP53 in the oncogenes. This small tweak, to so many genes, could end him...

As the cell proliferation triggered development of tumours within the peon at a cellular level, a gleam of vanity and pride shimmered in your (e/c eyes), as you relished in the true power you held, to heal or destroy at will. Honestly, with Shigaraki by my side you had no issues exploring the darker side of your quirk...

The man began to collapse, screaming, as his body became distorted with masses; clawing at his skin violently, "Please just kill me- KILL ME!" He begged, as desperation clouded his bloodshot eyes. You looked at him with cold indifference, shrugging nonchalantly.

The peon fell to the ground, writhing. As you stood up and clenched your hands, tightly, even with the contact broken you could continue to encourage the malignancy to spread. The man faintly glowing in purple below you might see you standing above him as a final act of mercy, but in truth, you were bored of him. With one last motion, it was done- his body was a disbelieved mass of malignancy, toxic even to look at.

A final gasp of air escaped his bloody, cracked lips, as your quirk extinguished the small sliver of life that remained in him. You blinked slowly, as you released your grip and kicked the body away from you with revulsion. As you looked into Tomura's eyes, your fox hood fell away, revealing a twisted smirk. "It's done."

"I expected no less of you, Operon." The villain rasped, a slight smirk clear on his face as he looked down at the corpse that lay in front of you... at your first kill.

"Tomura." You stopped as he placed a finger delicately on your lips. Taking a deep breath again you tried to center yourself, you'd just killed someone, this was not the time to have a heart to heart. You weren't sure there was ever a time. Yes, sometimes he seemed vulnerable in front of you, but it would fade so quickly and he'd return to the facade he wore daily.

"Breathe, you played your part well. The League will be pleased."

As he spoke you could feel your body beginning to collapse, whether it was exertion or exhaustion- you needed to speak, "But Tomura, are you?"

"Yes, Operon, I am." He stated, his red eyes piercing yours with sincerity.