An idea I adopted from Loosescrewslefty.

Should be relatively silly and short. At least that's the intention, we'll have to see as writing goes.

It was very, very, very rare for Cataclysm to not work for Adrien. Actually, it hasn't ever really failed him before. The destructive power answered to him, however he wanted something destroyed, it got destroyed in that way.

A statue breaking into pieces.

A bus malfunctioning.

Making the floor weak enough for only the akuma to fall through.

Cataclysm just doesn't fail him.

That is, so long as Adrien had a good idea on what he wanted, on what to do with it.

Typically, Adrien did.

If not, Ladybug did, and he just acted out on her plan, with him usually doing a very good job in knowing how she wanted something destroyed, how that can help her with her plan.

So Cataclysm failing him?

He never considered the possibility.

But, there's always a chance. There are such things as miscalculations. And Adrien can admit, a few times as Chat Noir, he has miscalculated before. More often than he would like to admit, he needed his Lady's help.

So miscalculating with Cataclysm?

It was bound to happen sometime.

They were facing a large akuma, a big snake known as Adder. And Chat was getting desperate and impatient. They've been chasing this snake all morning, and he was having one of those days that he just wasn't in the mood for this episode. Seeing Ladybug was always a delight but this akuma made it difficult to spend time with her, with Ladybug persisting to run ahead, trying to get the possessed item as quickly as possible, Chat was struggling to keep up.

It was only natural that he'd end up snapping at some point.

He acted out ahead of Ladybug, thinking he could buffer Adder through a collapse in the streets. Usually, that worked for him.

It didn't work so well this time.

Instead of trapping Adder like Chat planned, his Cataclysm caused a bigger collapse than he expected, and this part of Paris was susceptible to sinkholes, making Cataclysm unideal to use here. Long story short, kitty fell down the hole instead.

And Adder just slid over the collapse, sliding on in between buildings.

Unfortunately for Chat, his sinkhole was much deeper than he expected.

And there was more than dirt at the bottom.

His only warning was the shine of a reflective surface before he hit something cold and overwhelming.

Water.

He was in water!

He scrambled, rushing through the water, gasping as he broke forward, an instinctive panic going through him, making him claw towards the edge. In his rush, he was barely aware of the sting of something pulling at his hair, gripping the strands tightly.

Adrien pulled himself up, rolling on the dirt, his breathing shaky as he coughed and hacked, his heart pounding from the near experience.

He didn't like that.

He didn't like that at all.

Adrien shuddered, shaking himself a little.

He gave a start when he heard a shaky groan right above him, felt movement on his head.

"Let's never do that again."

Adrien sat up, accidentally sending Plagg flying off his head. He stared down at an equally wide eyed kwami, one that was gazing at Adrien's hand. Adrien looked down, tensing to see the black ring with the green paw pad on his bare hand.

Adrien gripped his hand, staring at the activated miraculous, then looked to the kwami that was sitting outside of it.

"Pl-Plagg?" Adrien uttered.

The kwami didn't respond, staring at the ring, looking utterly surprised and confused. He looked to Adrien, moving to speak, only to be cut off when a rustle of water drew both their attention to the pool they had landed in. Adrien drew near it, curious and alarmed.

What was in there that was moving about?

He jumped back with a scream as something black burst forth, black claws wrapping around his wrist and gripping him hard. Adrien scrambled back, unintentionally pulling the owner of those claws out of the bright pool, allowing Adrien to clearly see who was struggling out of the water.

And gape at who was before him, dripping wet.

There, right before him, gripping his wrist like a lifeline was a gasping and coughing Chat Noir.

"No way," Adrien whispered, watching those ears twitch at his voice.

Chat looked up, locking his cat like eyes with Adrien's.

Chat gasped, ripping away from the blond, his cat ears perked straight and high in alarm. "You, you—" he started, pointing at Adrien.

Adrien just sat quietly, staring back at him, mouth hanging open.

Chat looked to Plagg, who gazed back at him, also equally surprised. And looked a little unnerved.

Chat uttered in a breathless tone, "You've got to be kitten me."

Adrien broke out into a shaky laugh, gazing at Chat. "This, you, this can't be… you, you got to be some kind of Copycat—"

"Copycat?" Chat repeated sharply, offended with his ears going down. "I assure you, I am fur real." He stood up, narrowing his gaze down at Adrien. "If anyone's a copy…"

"I'm Adrien Agreste!" Adrien insisted, standing up as well. Setting his hand on his chest, he pushed as he pointed to the ring on his finger, "And I'm Chat Noir!"

Chat pointed out in a slightly teasing tone, "Well, not right now."

Adrien tensed, glancing down at his transformed miraculous, then to Chat Noir, who didn't have the ring on his hand at all.

Yet, he stood right before Adrien.

Fully transformed.

Just no ring on him.

"How is this possible?" Adrien wondered, running a hand through his hair, sliding it down to his neck. "I, I should be…"

"Atlantes," Plagg answered, drawing the two over to gaze at the kwami.

He was floating over the pool they came out of, a grimace on his face.

"The city under the sea?" Chat asked.

"No, Atlantes is a French sorcerer from a looooong time ago," Plagg told them, drifting around this pool. Looking down at it, the two blinked at the faded runes that littered and framed the pool. "He made this thing, a mirror pool I think, that evidently… reflects you or something? Or is it split? Ugh, I don't know, it's been forever since I read runes," Plagg huffed, crossing his arms, ears going down in annoyance.

"Can Miraculous Ladybug fix this?" Adrien demanded, drawing near the pool.

"Don't!" Plagg cried as Adrien drew near the edge. Adrien froze. "You touch that again, there might be two Adriens. This thing here, it splits up different sides of you."

Chat harrumphed behind them. "One is more than enough."

Adrien shot Chat a look, bothered by Chat's tone.

Chat peered back, unapologetic, tail flicking about.

"Miraculous Ladybug won't fix this," Plagg said, drawing near his holder. "It reverses magical damage. This isn't magical damage. This is a magical division."

"Magical division?" Adrien repeated. "Like in math and science?"

"Magic is a science," Plagg said, "a complicated science. A bit… spiritual? Is that the word I want?" Plagg shook his head. "It doesn't matter. What does matter is that Ladybug can still help us." The kwami offered Adrien a sly, teasing grin. "A healing kiss from Ladybug can reverse magic hexes like these sort."

Adrien gave a start, blushing. "Ki-kiss?"

Chat perked, a smile growing on his lips. "Either of us kiss Ladybug?" he asked with bright eyes.

"Adrien should be the one to kiss Ladybug," Plagg said, "you kiss her Chat, you two be separate forever."

"Me?" came a high squeak Adrien, his cheeks flared red.

"You do have the real miraculous," Plagg pointed out, rolling his eyes. "And Ladybug has the power to restore order; the tricky thing is that this is you, her opposite, avatar of chaos and destruction. For order to be restored, it's got to be done right with you, the true wearer of the miraculous, doing it. So go live the dream and smooch her real good!"

Adrien covered his cheeks, getting redder and redder at the amazing and frightening fact that he had to kiss Ladybug and Plagg had to shut up cause he was not helping.

Beside him, Chat smiled green eyes glinting. "You don't say," he murmured, tapping his chin. "I kiss Ladybug, I am Chat Noir and he is Adrien Agreste, and we'd continue to be separate henceforth."

Plagg and Adrien gave Chat a wary glance.

"Chat," Adrien stressed slowly.

"It's an easy solution," Chat dodged, turning away, his tail curling in delight as he prowled towards the opening above. "I'll be Chat Noir, which I love to be. No more Adrien Agreste for me. No more modeling. No more pleasing. No more cheese!"

Plagg gasped in horror. "You take that back!"

"You can be Adrien Agreste." He turned to them, declaring with a flashy wave of his claws, "You can live that restricted life! Ladybug and I will continue to protect Paris together, and be together forever."

His baton lit up, bright with a call.

Chat grinned, taking out his baton and waving it to them. "And the Lady doth beckons."

"No!" Adrien cried, rushing to him.

"Stop him!" Plagg cried out, racing towards him.

Chat easily leapt away before they could reach him, jumping out of that hole and disappearing from sight, leaving Adrien and Plagg in that hole, gazing after him.

Adrien nervously stared after Chat, wrapping his arms around himself, nervous. "Plagg?"

The kwami gave a tired hum, grimacing as he gazed outwards.

"This, this isn't good."

"No it's not Kid, no it's not."