You can try searching on fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. Just type in 'Adrien finds the Peacock Miraculous' in the search bar and browse through the results.
Some smaller, Miraculous - specific fanfic communities might also have such stories. For example, there could be Miraculous Ladybug fan groups on Facebook or Discord. Members often share their own works or recommend stories they've read. It might take a bit more effort to search through these platforms, but it could be worth it if you're really interested in finding that particular fanfiction.
Well, another place to look could be Tumblr. There are often fanfic writers who post snippets or links to their full stories there. Sometimes they might tag it with relevant tags like 'Miraculous Ladybug', 'Adrien', and 'Peacock Miraculous'. So, do a search using those tags and you might find what you're looking for.
One possible plot could be that Adrien stumbles upon the Peacock Miraculous by accident while exploring an old attic in his mansion. He then has to figure out what it is and how to keep it safe from Hawk Moth.
You can find a lot of fanfiction on Archive of Our Own (AO3). It has a huge collection of Miraculous Ladybug fanfictions, including many about Adrien and Marinette. Just search for the tags related to the show and the characters, and you'll be presented with numerous options.
You could try looking on fanfiction websites like Archive of Our Own or FanFiction.net. They have a large collection of Miraculous fanfictions, and you might be able to find this one by using the search function with the exact title or related keywords.
You can try searching on fanfiction websites like Archive of Our Own (AO3). There are a lot of Miraculous fanfictions there, and you can filter by tags such as 'Adrien hurt' to find relevant stories.
In a fanfiction, Adrien's mom might have used the Peacock Miraculous to create something special. For example, she could have created a magical object that was meant to protect Adrien when he was born. But then, due to some unforeseen circumstances, she had to disappear. This would tie in the Peacock Miraculous with Adrien's backstory in an interesting way. The story could then explore how Adrien discovers this connection as he grows older and becomes more involved in the Miraculous world.
A plot could involve Adrien being given the Peacock Miraculous by a mysterious figure. With this new power, he tries to use it to protect a loved one from a new, powerful enemy. However, the power of the Peacock Miraculous starts to affect his emotions and he has to learn to balance his feelings while using the miraculous effectively.
A plot twist might be that the Peacock Miraculous starts to have an unexpected effect on Adrien's personality. Maybe it makes him more assertive in a way that his friends find a bit strange at first. He could start to make decisions that are out of character for him, like taking more risks in battles, which could lead to both positive and negative consequences. He might also develop a connection with the Miraculous that makes it difficult for others to use it when he's around.
In the fanfiction, it could be that Adrien's mom had a special bond with the Peacock Miraculous. She was able to use it in a unique way that no one else could. But using it also put her in danger. When she had Adrien, she knew she had to protect him from the threats associated with the Miraculous. So she disappeared, leaving behind clues for Adrien to find when he was old enough. As Adrien uncovers these clues, he gets closer to understanding his mom's connection to the Peacock Miraculous and the secrets she held.
Adrien could develop a darker side. The Peacock Miraculous has some negative connotations in the show. If he uses it, he might be influenced by its more shadowy aspects. He could become more secretive and withdrawn as he struggles with the power and the potential harm it could cause.
You can try fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. There are likely many fan-created stories about Adrien and Marinette sharing a kiss in the Miraculous universe on these platforms.