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in the dark, be your light (1222 words) by AlexSeanchai
Chapters: 1/?
Fandom: Miraculous Ladybug
Rating: Teen And Up Audiences
Warnings: No Archive Warnings Apply
Relationships: Adrien Agreste | Chat Noir/Marinette Dupain-Cheng | Ladybug
Characters: Adrien Agreste | Chat Noir, Marinette Dupain-Cheng | Ladybug
Additional Tags: Trans Adrien Agreste | Chat Noir, Female Adrien Agreste | Chat Noir, Soul Bond, Accidental Bonding, Telepathic Bond, Mutual Pining, Secret Identity, Misgendering, Fluff, Romantic Angst, trying for more fluff than angst, but this might not work, Rating May Change, Season/Series 03 Spoilers
Summary:

Ladybug is probably straight, certainly doesn't want her partner to know who she is outside the magic, and absolutely positively does not want to know her partner's name.

Chatonne Noire can cope with that. Ladybug is the only person Chatonne can be truthful with; it isn't dishonesty not to tell her something she refuses to learn.

Chatonne Noire cannot cope with feeling, as intimately as though these were Chatonne's own emotions, how Hawkmoth or some lesser bully tangles her Lady's stomach in knots and rips burning holes through her Lady's heart. Not while staying as helplessly distant as if she were watching from the moon, when for all Chatonne knows, Ladybug is at the next desk. And once they can copy homework from each other's thoughts—

What will Ladybug think when Chatonne can't keep this secret anymore? And why does the thought of knowing terrify Ladybug so?