Timeless Moonlight Ride on a Hippogriff by Norbert & Fluffy

Harry And Hermione magically go back in time to rescue Buckbeak the hippogriff so they can escape with Harry’s godfather, Sirius Black. (One of the illustrators got an "A" on the book report on which this drawing appeared!)
Based on the cover of Prisoner of Azkaban, originally illustrated by Mary Granpré