A/N: Requested by Swiftdragoon, and it's actually "Cheater and Abusive Infinite Stratos girls x Vengeful Copen Male Reader x Yandere and Caring Female Human Autobot and Decepticon Faction"
(The sun dipped below the horizon, casting a warm orange glow over the cityscape. Y/N, once a devoted member of the Infinite Stratos Academy, stood atop a deserted building, his eyes scanning the streets below with a cold, calculating expression. The gentle breeze played with the edges of his coat, but inside, there was no peace. His heart had long since turned to stone, and the warmth of his past life seemed like a distant memory.)
(He had been betrayed—by the very women he had once loved and trusted. The Infinite Stratos girls, his supposed friends and partners, had not only cheated on him but had used and abused him until he was nothing more than a pawn in their twisted game. The scars they left ran deep, and the pain had festered into something far more dangerous: vengeance.)
(Y/N was no ordinary man. Beneath his calm exterior lay the mind of a genius and the heart of a warrior. He had once fought alongside these women, piloting his own version of the IS, crafted from stolen and modified technology. He had been their equal, their ally. But now, he had embraced a darker path, becoming something far more dangerous.)
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(He was Copen, the weaponized force of retribution.)
(It had started innocently enough—Y/N, a brilliant and talented pilot, had joined the Infinite Stratos Academy in hopes of becoming the best. The academy was home to some of the most powerful and skilled women in the world, each capable of piloting the IS suits with grace and power. Y/N had been drawn to them, captivated by their strength and beauty. But then Houki, Cecilia, Charlotte, Laura, Lingying, Tatenashi and Kanzashi cheated on him with Ichika Orimura.)
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Houki: (moans) Come on, Ichika. You know you want it.
Ichika: (groans) But Houki... you have Y/N.
Tatenashi: Oh please, he's just a petty thief, nothing more.
Laura: Yeah, fuck him. You are my bride, Ichika.
(Days later, Y/N decided to break up with them, leading them to show their true colors by beating him up without any remorse.)