Disclaimer: I do not own Miraculous: Tales of Ladybug and Cat Noir, only how the story goes. The characters of Miraculous: Tales of Ladybug and Cat Noirbelongs to their creators. The only thing that I do own are the OC's of the story. I apologize for any errors in grammar and/or if I was not accurate in reference to something.

A/N: Ever since getting started on this show, I have had so many ideas for the Ladybug and Cat Noir duo. Mostly with team ups with other kinds of heroes.

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A Brand New Sentimonster

It was a quiet evening in the city of Paris as the sun was setting. In a bakery in the middle of the city, a young girl with blue hair, wearing a dark gray blazer with rolled up sleeves, a white T-shirt underneath it, pink rolled up jeans and light pink ballet flats. On her ears she was wearing a pair of black earrings and a necklace that looked like half of the yin and yang symbol. She was walking up a flight of stairs when she heard a voice shout, "Marinette! Make sure to finish your homework!"

"Don't worry, Mom. I'm heading up to my room now!" Marinette shouted up to her mother. She headed up to her room which was at the top of the house. When she opened the floor door, she came into her room before closing it shut. When she was sure that she was alone, Marinette Dupain-Cheng opened up her purse to let a small red and black creature out. The creature looked to Marinette and said, "Well, that was quite the workout."

"Tell me about it, Tikki." Marinette sighed as she sat down in her chair. With a slight grin she said, "Who knew that fighting Gigantitan for the third time would be so exhausting."

"At least everything seems to be quiet at the moment." Tikki said to lift her spirits. Marinette nodded in agreement, "Yeah, we should at least try to enjoy the peace while we can."

Both Marinette and Tikki laughed a little before the former got started on her homework.

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Over at a much bigger house, the door to a bedroom opened to a young man with brushed-back blond hair and emerald green eyes. The boy was wearing a white button-down shirt, a black shirt with five, different horizontal lines around the chest, a pair of blue jeans and orange sneakers. On the ring finger of his right hand, he was wearing a silver ring. The boy walked into his room when he heard a voice say from behind him, "Remember, Adrien, you have numerous appointments after school tomorrow. So you should get some rest."

"Thank you, Nathalie." Adrien said when he glanced back to the door. He closed it behind him and set his bags down next to his bed. He opened his shirt and a little black creature came flying out. The little creature seemed to be annoyed when he said, "How many times is Hawk Moth going to akumatize that little baby. It's getting super annoying. Not to mention that it's getting super embarrassing, even for Hawk Moth."

"Yeah, you'd think he'd learn from his first few times of akumatizing baby August. You're right about that, Plagg." Adrien agreed on that much. With a nod he said, "But at least it seems to be quiet tonight."

"Then I say that we should at least celebrate with some cheese." Plagg said with a big grin. Adrien could only smile from his friend's antics and said, "I think I'll pass. I've got to finish up some homework before going to bed. But you have fun."

"All right, more for me." Plagg said before flying over to the cabinet that housed his cheese.

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In another room in the house, in an office of sorts, a blond haired man wearing a white dress shirt underneath a gray vest along with a red-and-white striped tie. He was also wearing red dress pants and white shoes. He wore a pair of black-framed silver glasses upon his face and a silver band ring on his left hand. He stood in front of a portrait of a blonde woman and looked at it with mixed emotions. The door opened and a black-haired woman wearing black and red framed glasses, a red turtleneck sweater, black business suit and black medium-heel shoes. The man looks back as she walked up to him and said, "Well, Mr. Agreste, that was more a disaster than we had hoped."

"I have got to akumatizing that baby." Gabriel shuddered when he thought. He pinched the bridge of his nose when he was frustrated with how it all went down. Taking a deep breath, Gabriel looked to his assistant and asked, "Has everything been handled, Nathalie?"

"Yes, sir." Nathalie nodded. Then she said, "Adrien is in his room, taking care of any last minute homework before going to bed."

"Good." Gabriel nodded as he was pleased. Then he asked, "Have you managed to go through what we have of the Grimoire?"

"I did." Nathalie said and brought out her tablet. She swiped the screen multiple times and said, "Based on what we now, amokitized and akumatized villains have great powers on their own, but together…"

"It could create something powerful." Gabriel finished and he turned away from the portrait. He took the tablet from her and looked over the contents. But then he frowned when he said, "But it wouldn't be enough. Ladybug and Cat Noir would find a way to defeat it."

Handing the tablet back to Nathalie he said, "If I want to at least have a shot of defeating of them, then I need more than an akumatized or an amokitized villain. I need an ally that could really turn the tables against them."

"Like someone who already is a villain?" Nathalie asked, making sure that she understood. Gabriel nodded and said, "But I have no idea what kind of villains or pawns are out there in the world."

"Perhaps you could create an akumatized sentimonster that could transport you to a different plane of existence." Nathalie suggested, mostly joking about it. But her words seemed to sink into Gabriel's mind. Turning to her he said, "That may be the answer, Nathalie. I could try and create something like that."

"But sir…" Nathalie said, feeling that it may or may not work, "The chances of you being successful with this are very slim. And even if you are able to discover new worlds, whose to say that you'll be able to gain their support?"

"I have to try Nathalie." Gabriel said as he looked back to the portrait. Nathalie knew that he was once again thinking about his beloved wife and Adrien. She then pointed out, "What about Adrien? Who knows how long you could be gone."

"I will make for a way to remain in touch with you, Nathalie." Gabriel promised her.

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Gabriel walked up to his son's room and knocked on the door. He heard Adrien say, "Come on."

Opening the door, Gabriel walked into the room. He looked to see his son sitting at the desk doing his homework. Adrien turned to look to his father and he said, "Yes, Father."

"I have some rather unfortunate news, Adrien." Gabriel said as he looked his son in the eye. Then he said, "I have to go abroad to help with my next line of clothing. I'll be gone for a few weeks at least."

"Oh." Adrien dejectedly said, wishing that it weren't the case. Knowing that he didn't want to be away from Adrien, but felt that it was necessary. Walking over to his son, Gabriel placed a comforting hand on Adrien's shoulder and said, "Worry not, Adrien. I won't be gone for very long and I'll tell you all about my trip."

"Ok, Father." Adrien said with a big grin. Gabriel gave his son a small grin before walking out of the room.

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A little later that evening, Gabriel had come to the stadium alone at night and looked about to see if anyone was watching. He removed his tie, revealing two jewels sitting on his shirt, and said the command, "Nooroo! Duusuu! Unify!"

Two objects, a blue stone brooch and a blue brooch in the shape of a peacock's tail feathers, glowed before turning a darker shade of blue and the stone gained four clothed ends while the lower jewel fanned out like that of a peacock. A spectacular light enveloped his body and Gabriel Agreste underwent his transformation into Shadow Moth. The villain now wore a blue violet business suit with the end like that of a peacock. He wore a mask that was mostly gray except for the translucent eyehole over his right eye. In his left hand he held a cane while in his right he held a fan made out of peacock feathers.

Placing his cane under his left arm, Shadow Moth used his free hand to switch the fan so he could pluck a feather from the fan. He placed the fan into his palm before clenching his hand into a fist and gathering an amount of dark energy into the feather. When it was complete, Shadow Moth opened the top of his cane and brought out his remaining ring. Placing the feather against it, the feather disappeared into ring. Shadow Moth didn't want to use such beloved family heirloom, but felt it necessary for his plan. Then thinking real hard about what kind of Sentimonster to create, it suddenly materialized in front of him.

The Sentimonster looked like a little, black goblin monster with curved back horns. Shadow Moth opened up his cane and released a little white butterfly. It flew into his hand and he gently clenched his hand again before gathering another big amount of dark energy into it. When it was ready, he opened his palm and said, "Thanks to the negative emotions from myself, I can akumatize my Sentimonster to give it more power."

Holding the butterfly close to the ring and it disappeared into the ring as well. Looking to the Sentimonster he said, "Gate, I am Shadow Moth. I'm giving you the power to open up portals to other dimensions so I can bring back allies in order to defeat Ladybug and Cat Noir to gain their Miraculous."

An idea suddenly came to him and he added, "But in case they or any of the other Miraculous holders should follow me in, the power of channeling their Miraculous should be enough to bring them back. After all, I do need their Miraculous to pull off my plan. Understand."

Gate the Sentimonster nodded before he became akumatized, grew bigger and opened his mouth to reveal a huge red gate appeared.

Unbeknownst to Shadow Moth or Gate, a janitor had been passing by and had seen it all. He whipped out a phone and started to call for help.

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Back at Marinette's place, she had just finished her homework when her phone went off. She picked it up and turned it on, Nadja came on and said, "Don't be amused, it's just the news. The villain Shadow Moth has just been spotted at the Paris Stadium."

Marinette gasped when she saw the footage showing her archenemy. And he was standing in front of what appeared to be a new Sentimonster. Looking to Tikki she said, "We can't let Shadow Moth use that."

"Hm." Tikki nodded. Marinette then shouted, "Tikki! Spots On!"

Tikki suddenly flew into the right earring and the black jewel turned into that of a ladybug. The five black spots shimmered as the transformation began. Marinette brought her hands before her eyes before moving them just as a ladybug themed mask appeared on her face. Then throwing her arms out, a ladybug themed spandex suit appeared over her arms before it spread over the rest of her body. A ladybug themed yo-yo appeared on her side as the string wrapped around her waist. When the costume completely materialized on her body, Ladybug then struck her usual heroic pose. Looking about she made sure that the coast was clear before heading up to the roof of her house. She opened the hatch before carefully closing it. Then removing the yo-yo from her waist she threw it before using it to swing across the city.

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At the Agreste estate, Adrien was just about to finish his homework when his phone went off. He turned it on to receive the same message. Plagg came flying up and said, "So, I guess we go and meet up with the girls, huh?"

"We can't let them face Shadow Moth and his new Sentimonster alone." Adrien pointed out. Plagg just sighed as he knew where this was going. Adrien punched a fist with the ring forward as he shouted, "Plagg! Claws out!"

Then when he moved his hand with the ring in front of his face, Plagg cried out as he was sucked into the ring. Adrien began the transformation by running his other hand over his head and two cat-like ears made of fabric appeared on his head while his hair covered his ears. Then with a swipe of his fingers in front of his eyes, a cat themed mas appeared. He threw his left arm out just as a black sleeve and glove with claws appeared. The rest of the fabric materialized over his body and a black belt appeared like a tail before it wrapped around his waist. Cat Noir finished up by making a few clawing motions before pulling off his super hero pose.

Cat Noir ran over to a window before carefully opening it up. Quickly taking a peak behind him, he was slightly relieved that his body guard wasn't coming through the door. Taking his stick from behind his back, he caused it to extend before pole vaulting out of the room.

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In a dimly lit studio room, a man walked in. When the lights brightened, they revealed a grinning Shadow Moth.

"Greetings! I am Shadow Moth." The villain said. Pointing to the viewer he said, "I'm afraid that that's it for this chapter. If you want to see more, then I suggest that you go to the next chapter."

He gave a chuckle when he said, "I should let you know that there are two different versions of the upcoming chapter. It will allow you all to see how the author will be proceeding with the type of stories that he writes.

"But until then, keep an eye out." Shadow Moth said before the lights dimmed once again.

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Author's Note: And that's the end of this little short story. And like Shadow Moth said, there are at least two different versions of the next chapter. It's supposed to help with my Miraculous stories that I plan to do. I look forward to reading your reviews. Be sure to leave a comment either about if I've done something wrong or if you want something specifically to happen. See you next time.