Frozen: A New Tale of the Marauders

In the land of Gryffindor, there was a brother and sister who loved each other dearly, but when young Sirius accidentally hit his sister with his magic, everything changed. Will Lily be able to be close with her brother once again? I do not own Frozen or Harry Potter or any of the characters and such, Disney and JK Rowling do! I hope you like it! :)