Academy AU where all of the students are dragon/human shapshifters. Each student has an amulet that helps them “control the dragon” and the school staff is responsible to teach student learn how to maintain their human form without depending on their amulets, along with other useful skills – flight/speed training, normal school lessons, how to manage both forms, etc.
Her name is Cirrus Cloud, a pegasus that attended flight camp with Rainbow Dash and Fluttershy. She used to bully Fluttershy when they were young. But after she grew up and heard about Fluttershy’s adventures since moving to Ponyville, she meets up with her at the Flight Camp Reunion to make amends and congratulate her for her accomplishments.
Also, piercings and dyeing wings confirmed for canon.