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Summary:

"Ah finally! I was beginning to think I would never get One for All back."

"Y-young Midoriya?"

"I have to thank you Toshinori. For bringing back what once was mine."

Notes:

(See the end of the work for notes.)

Work Text:

"Midoriya! Get back here this instant! We are not to intervene in the fight! Let's get Bakugou and leave!"

Momo instantly realises something is wrong when she notices the smirk on the greenette's face.

"Ah, but Yaoyorozu-san, didn't we say we wouldn't fight the villains? It should be alright if I only fight the heroes, right? Besides, I don't think it will be much of a fight with how weak they are."

They all come to the same, conclusion: This isn't Midoriya. The small team realises that despite their initial objective they won't be able to avoid a fight and prepare themselves, but something is definitively wrong when Momo can't make a Bo staff. She looks back at the others who share the same look of horror. None of them can use their Quirks.

"You children are cute, but I have a 'childhood' bully to fuck up." and then blood paints his newly bought disguise.

___

One second, All Might was facing All for One, the next, his ennemy disapeared with a banshee like scream and in his place stood his own protegee under the horrified gaze of Shigaraki. It takes a moment for the blue haired man to shake out of his stuppor and less for him to jump over the One for All holder, intent on making him pay.

Toshinori was ready to jump in between, but the smaller boy grabbed the man by his wrist with a smirk, preventing the other from fulfilling his wish for decay and spoke words that would haunt the Hero for the rest of his days, fully conscious that he had lost the moment he had chosen his successor.

"Oh, hey Shimura-kun! I know you put in a lot of effort in all of ....this." he gestured to their surroundings, actually swinging Bakugou- Oh god, he had Bakugou -around by his hair "But that person you were following? He's not real. I made him using one of my old Quirks. A distraction from the real me, you get it? Oh, but you really helped me with all of that shit you started, keeping the looks away from me."

At that point, Shigaraki had stopped struggling, his fingers bloody from scratching at the rock like skin, letting the words sink, his expression morphing as he seems to understand what the boy- or is he really as young as he seems?- is implying.

"Sorry though, you're of no use to me anymore."

And the heroes watch in silent horror as the scrawny man starts crumbling into dust starting from the wrist Midoriya was holding and spreading all throughout his body. His expression is sad and full of betrayal and confusion when he fades into non-existence.

Satisfied with his 'work', Midoriya dusts the leftover ashes of his pants, his other hand still holding on to Bakugou's platinum hair, as if it were mere dirt and not what once was a human (but seeing the expression on his face, it might as well have been), turns towards the group of heroes, still paralised in shock and makes a backhanded mouvement in All Might's direction, provoking harsh winds and sending a few people flying backwards.

"Ah finally! I was beginning to think I would never get One for All at a hundred percent."

And finally, finally, the hero finds the strengh to open his mouth and speak.

"Y-young Midoriya?"

And the boy grins as if he had heard a hilarious joke.

"Old Midoriya actually! The young one died when he was nine." All Might gulps "I wanted to raise Izuku to become my heir, but then you kind of destroyed my face so I needed a new body. Plus, his version of All for One was much better than mine! Attracting Quirks without even needing contact, a power so subtle he was misdiagnosed Quirkless."

The more the boy- man? -talks, the more sick Toshinori is feeling.

"Have you noticed how Quirk disappearance was more frequent around Musutafu? Specifically around middle schoolers and more recently, UA students."

At that, All mights meets the greenette's gaze. Kendou, Tokoyami, Shinsou and so many others who lost their powers... And all the other does is smile wider, mocking the hero's sorrow.

"Now you're really getting it! And on top of that, I have the two sides of the coin within my hands. All for One and One for All! To think you, the symbol of peace, brought the end of this Hero society you wanted to protect so much."

And he laughs so hard, he might just choke on air. All might is almost hoping he chokes.

"I have to thank you Toshinori. For bringing back what once was mine. And for my first act, in the destruction of this rotten society and the birth of a golden age, I shall make a sacrifice. An exemple of sorts."

He lifts Bakugou higher, some strands of hair being pulled out. Bakugou's eyes flutter open, slightly glazed over until he realises the situation, and mostly the agonizing pain of being lifted by the hair.

He snarls and scratches at the hand over his head, breaking is nails against what he recognises as his friend's quirk, but the teen- no, the man does not relent, raising him higher until even his toes won't touch the ground.

He yells obscenities, a succession of "Useless Deku"'s and "Fucking traitor"'s with tears flowing from the pain.

"This boy has been tormenting people, leaving hand shaped burns and deep wounds within the souls of those who are judged to be weak. Those that posess a simple Quirk, those that lack it. He believes that their lives hold no value. He is the perfect representation of this disgusting Hero worshipping cult we call our society."

The man shakes the blond who cries out in pain, releasing explosions that seem to have no effect on the villain except for his clothes.

"And thus, I believe his death is necessary to turn a new page."

The blond is pulled forward, face almost touching his tormentor's.

"All Might?"

"What is it you-"

His eyes glaze over, and from the other side of a screen, a boy with purple hair and large eyebags recognizes his own Quirk, heart twisting when he realises what comes next.

"Show everyone how dangerous your Quirk is. I want you to use the remnants of your power...

 

... To kill Bakugou Katsuki."

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

"SMASH!"

Notes:

Quirks used in this One shot:
- Quirk attraction (Izuku's All For One) to steal the recue team's and Shigaraki's Quirks
- Overhaul to kill the rescue team
- Light mass (Fake All for One illusion, technically has been in use for several years) to distract the heroes from the real AFO
- One for All to hold Shigaraki and Bakugou
- Mind swap to exchange bodies with his son
- Decay (Stolen from Shigaraki) to kill Shigaraki
- Hardening (Stolen from Kirishima) used when Shigaraki bites and scratches at his harm. also used with Bakugou.
- Brainwashing (Stolen from Shinsou) to order All Might to kill Bakugo