Chapter 1: Heavy

Soulmate AU - (can hear the other when they sing)
Minerva McGonagall hasn't had the best of luck in the love department. What happens when she finds her soulmate which turns out to be the youngest black sister out of four. Y/n Black the youngest of four hasn't found her soulmate and thinks she doesn't have one. What happens when they find each other.

* Minerva is young Maggie Smith as she is the absolute best