Hogwarts School of Witchcraft and Wizardry

Marinette Dupain-Cheng, a pure-blood wizard gets accepted to Hogwarts School of Witchcraft and Wizardry. She is placed in Slytherin by the Sorting Hat.
Adrien Agreste who is also a pure-blood wizard gets accepted in Hogwarts School of Witchcraft and Wizardry. He is placed in Hufflepuff, but with his dad being a Proffesor and the Slytherin Head of House he wishes he trade houses with Marinette.
Marinette also believes she doesn't deserve to be in Slytherin and thinks she be in Ravenclaw.
But they both have a secret, the two learn it in their 3rd year. Could it be the reason why Dark Wizards are coming after Marinette and Adrien?

Happy Reading :)