The Black Cat is Jealous (MariChat one-shot)
Chat Noir, our flirtatious little cinnamon roll, spots Marinette having fun with Nathaneal. Laughing, talking, having a good time. Chat knows he loves Ladybug, but then there is also Marinette, the quirky, funny girl he loves to hang out with. So when his fun-loving Princess is in the arms of another, well, let's just say that Chat doesn't become the nicest kitty.