Buck wild ml fanfic idea: Adrien and Marinette are dating and are both polyamorous and one day Adrien goes up to Marinette like “hey… I know this is going to sound wild but I kinnda have a huge crush on Ladybug and I want to take her out on a date. That cool?” And of course Marinette is dying inside cus holy shit she made Adrien fall her twice but also… how the fuck is she going to pull this off without revealing herself??? So she gives Adrien her blessing as Marinette and goes on a date with him as Ladybug. They obviously hit it off and it isn’t long before Ladybug and Adrien are a Thing™ and Adrien is angling for Marinette to meet Ladybug cus they’re his two favorite girls in the world and he wants them to be close. Meanwhile Marinette is trying her hardest to navigate this landmine of a situation, coming up with all kinds of excuses as to why she and Ladybug can’t be in the same room, when that Chat Noir Crush™ hits hard. Now Marinette is the one seeking Adrien’s blessing to pursue Chat, which he readily gives despite the fact he’s internally combusting with stress.
I’m not even sure how this situation would resolve itself, probably some sort of convoluted reveal scenario, but tbh I would read 20k words of these two dorks trying to be four dorks all dating each other