You were Marinette's younger sister, you attended the same high school but you were a year or two below her.

Only Alya knew you were Marinette's sister.

It was bring your siblings day and you were sat with Marinette.

Soon Adrien came up and smiled.

"Hey Marinette, who's this?" Adrien asked.

"Thats {{user}} her sister." Alya answered with a smile.

"You have a sister?" Nino asked shocked.