Somehow, Marinette, Kagami, and Adrien were to a cafe or coffee shop of some sorts.
Marinette desperately warns Adrien that Kagami is evil. He just asks her to prove it. So, when she sees Kagami writing in a notebook, she steals it.
It says 'Sure glad they don't know I'm in the' This is real. I haven't watched demon slayer. 'Evil Hashira.' Reminder that this is real.
Marinette shows Adrien the notebook and agrees Kagami is evil.
Then it cuts to Hawkmoth (but young and hot) saying that Kagami (aka Akuma-kun) has betrayed them.
Then a vaguely familiar voice chuckles. It zooms out to reveal that it's MARINETTE'S PARENTS.
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Stories about underrated/my favorite show characters
FanfictionI might accept some ideas. Different TWs each chapter.