A commission of the artist’s interpretation of a scene from the comic We Will Be Adored, wherein Sonata confronts Twilight for leaving them for dead.
Not going to link to the comic, since it’s VERY adult, and I don’t think the artist would want to be associated with that…but search derpi for “comic:we will be adored” or “comic:we will be adored part 37” and you’ll get there.