New teacher- HP Wolfstar AU

AU where Sirius and Remus are both teachers at Hogwarts and they hadn't met before but they meet each other on the platform and become friends, Remus doesn't know that Harry is Sirius' Godson. starts in Third year because its my favourite movie and book also because i want to go along with a set story. Sirius had already been teaching at Hogwarts as the Astronomy teacher.