Marinette has been ladybug for a long time now, and Cat has been flirting non-stop, not to mention she is unsure about her feelings for Luka. Not to sure of what to do, she turns to her friend from another school named (Y/n) for advice one night at a sleep over. However, when the next morning comes, Marienette made sure to leave her earrings with (Y/n) and a note saying that she would be sure to retrieve them once she was in the right mind set.

'Falling for me already?' Y/n Dupain-Cheng, Marinette's twin sister. What happens when she discovers her sister's biggest secret- and catches the attention of a certain black cat?