A Fall from Grace, and His Rise from Disgrace

I'm Here To Kick Your Ass

  "You impertinent pests! I-" He was interrupted by Izuku's fist meeting his face, while Izumi's knee met his stomach.

  The two students backed away from the villain's flailing arms before rushing back in, striking him again in unison. They aimed for his weak points, like the stomach or his joints to gradually weaken him like they did with All Might.

  All for One raised his arm to attack, but both teenagers ducked behind him and literally kicked his ass.

  Izuku spun on his heel, kicking All for One's raised arm away as Izumi moved in close, striking his ribcage right under his outstretched arm. The man grunted in pain, clutching his side before aiming both hands at the ground, sending a blast of air in all directions.

  Izuku cursed as they were blown back, giving All for One time to recover and compose himself.

  Izuku leapt back at the villain, throwing his right fist forwards, only for his metal arm to be caught, twisted and torn from his body. Another, smaller blast of air jettisoned Izuku back towards Izumi, who attempted to catch her brother.

  Izumi caught Izuku, the two siblings grinning widely as All for One brandished the prosthetic arm victoriously. The villain hesitated upon hearing a quiet beep.

  "Wh-"

  The explosion was small, but incredibly powerful. All for One was thrown across the crater, bouncing like a ragdoll on the concrete like a stone skipping on water.

  Izuku and Izumi were on the villain in an instant, Izuku with concrete spikes at his side, Izumi with emerald lightning glittering around her. All for One lay still as they leapt at him once again.

  The villain pounced, weathering the incredible blow dealt by Izumi to his side and grabbing Izuku by the throat, slamming his head into the ground, earning a sickening crack from his skull.

  Izuku went limp, and was promptly dropped by the villain. Izumi went to strike All for One again, but stopped when the villain raised his hand in Izuku's direction.

  "I've had enough." The villain said, panting heavily. "Even your damn father never pushed me this far. Give me One for All girl, or I kill your brother and rip it from your body."

  When the green lightning didn't fade All for One's arm tensed, the muscles beginning to bulge. Izumi let One for All fade.

  "Okay, stop! Stop! You win.. just.. take it. Please, don't hurt him. You can have One for All, just let Izuku live." She said tearfully, holding out a strand of her hair.

  The villain took the hair and looked at it in confusion.

  "Eat it. It's a DNA transfer." The girl said tiredly. The ancient man made a noise of understanding.

  All for One and One for All were reunited at last. Because of his heavy injuries, All for One's.. insides were different from most people's. His digestive system was much more efficient than other's, mainly to help with his healing when All Might caved his head in. He needed the nutrients quickly, so the doctor altered his organs.

  That is why, just a few seconds after swallowing the hair, dark red lightning sparked around All for One. He paid Izumi no attention as she grabbed Izuku's motionless body and carried him a little distance away.

  What did catch his attention was the masked boy sitting up as though nothing had just transpired. The boy reached up and plucked off his mask... And now the villain was worried.

  Because a boy, bruised and beaten, his weakened sister beside him, whilst staring at the greatest villain to ever live who was now at the height of his power...

  Was grinning like a demented maniac.

  "Why are you smiling boy? I have One for All, I'm invincible!"

  Izuku's eyes narrowed, deforming his already twisted face further.

  "Do you know what happens to an unprepared vessel when they receive One for All?" Izuku asked gleefully.

  All for One frowned. Izuku's grin widened.

  "They pop. Like a big, bloody balloon!"

  Now that he mentioned it, All for One was starting to ache all over. But that was just from the battle!

  All for One took a step forwards. His leg, still surging with the full force of One for All, detonated like a bomb.

  Shards of bone and lumps of flesh were sent flying, and a spray of blood painted the dusty concrete.

  Panicked, the villain moved his arms to catch himself. The only indication he got that they'd popped was the warm blood now covering his face, and the impact of his face meeting the concrete.

  "We really should thank you All for One. You're really solving all of our problems for us! One for All was really starting to hurt Izumi, so it's touching that you would sacrifice yourself for her!"

  All for One yelled in pain as One for All surged through what was left of his mangled body.

  A concrete wall threw itself up between the siblings and All for One's detonating body, shielding them from the flying blood and viscera.

  Goodbye brother.

  "YOICHIIIIII!!!" The supervillain screamed in rage as One for All blew him to bits.