Sorrow | Miraculous fanfiction | OC insert

After Ladybug's death, her identity was revealed. Adrien, still grappling with the pain of losing his girlfriend, his superhero partner, and his father, all in less than a week, is left to deal with his pain alone. When he finds out Ladybug made him the guardian of the miraculous, his whole world flips upside down with responsibilities he was never ready for.
To keep Paris alive, he is forced to become Chat Noir again, and with his new partner, Scorpienne, they keep the city from falling apart. But Gabriel's descendant is much more powerful, much more cunning, and much smarter, than they ever could have imagined...

(All characters are aged up, and are in university)