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The butterfly effect would be a direct effect of chaos theory.
An event occurs that produces a series of negative events for everyone,
It is not about destiny, in fact it is just the opposite, the moment in which a person changes the plot thread of events, a factory error, a mistake.
And hers was to trust his heart and not his head.
Chaos theory happens with an action that, compared to its outcome, is small.
In the wake of that event, the butterfly effect worked on its own, although it could have checked its yo-yo faster, the consequences do not wait for anyone, they appear when they least suit.
Undoubtedly, the decline began with that small event. Ladybug, she had stumbled as Marinette would have, thought her luck would be infinite, because the lucky lady never waits for her to run out, right? The Lost Kwamis, the Failed Heroes Luka had had to leave the city because of him, Gabriel had sent Adrien to London, the video of Felix and Kagami, the Agreste mansion, Nathalie, Gabriel, Emilie.
The small events led to a great event, one that in the end she would have to solve alone, this time as BugNoire, finally her most anticipated day, the defeat of Hawkmoth, Shadowmoth or Monarch had arrived and she had to fight alone.
And if chaos theory hadn't done enough, Marinette took it upon herself to give it more substance. Once again, he had put too much faith in the circumstances, Gabriel had made her believe that. This time Gabriel Agreste saw the opportunity to achieve his goal and as he always promised, he reached for the earrings and the ring and asked for his wish.
With the corresponding effects.
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Ladybug and Chat Noir were on some roof in Paris, having finished patrolling in case any danger lurked in the dark night, some days, perhaps weeks after the day when the Parisians seemed to breathe a sigh of rest.
"Hey Bugaboo, is there something bothering you?" asked Chat Noir as they watched the stars accompanied by a gentle summer breeze.
''Why do you ask?'' After that, there was a slightly awkward silence, Chat wanted to ask more, something that perhaps she would not be able to answer.
''... Since it was all over... I haven't seen you happy or celebrating Monarch's defeat."
and it was true, Marinette had stayed with her friends when they went to see Adrien, they had gone under the pretext of celebrating the heroic work of her father, which she had taken it upon herself to tell.
"Gabriel Agreste provided me with enough help to be able to fulfill my duty, much to my regret of how it ended his life, I send my sincerest condolences to the friends and family of the designer," Ladybug had told Nadia Chamak when the reporter managed to speak with her after what happened.
She had taken it upon herself to memorize that line as long as possible, she spent at least two hours repeating it in her mind because when she tried to think of all the evil she had promoted, her evil plan being obeyed, the nights she had cried for having the weight of being the guardian, when her mind allowed itself to say: "Gabriel Agreste was Monarch."
she automatically thought of Adrien and the consequences that would give him.
How ironic, since the less she had to think about the consequences, the more she did it and this led to:
"I don't think I should celebrate it. Not after I know it's not completely over yet."
''What do you mean?''
Before anyone else could utter a word, a flash in the middle of nowhere stunned the two heroes. A female silhouette in a violet-hued suit appeared in front of his eyes. With his arms outstretched, a kind of magic cloak reached the ground.
''What the hell?'' He heard the curse of Chat Noir just before he saw something coming out from under the woman's arm.
A foot, very similar to hers, a leg, very similar to hers, with dots, a torso just like hers, arms and a face just like she was.
But it wasn't her, her suit had inverted parts, with red dots on black cloth on her legs and arms, her hair was darker, with two high buns instead of two low pigtails. And his face... Along with his posture radiated negativity and cockiness, if he was now told that there is a hidden camera, she would believe it.
The silence was a little shorter than expected but was interrupted by the same woman who had just left her without oxygen to her brain.
"Wow, in the end the violet girl was right and there was... '' She looked up and down Ladybug, her double, in an action that would remind her of Chloe and ended up "a much worse version of me."
This chaos theory entailed a butterfly effect far worse than she could ever imagine.