I really love how you got the emotion into the piece with Sirius looking tense and desperate, and Remus looking deflated and depressed. Sirius Black is Just a Little Sick and Twisted
is my favourite oneshot regarding The Prank. I also love how The Prank was handled in Casting Moonshadows,
which is a LONG chapter fic. I'll shamelessly pimp myself and say that I wrote a oneshot about it called A Very Sirius Full Moon.
Not the most original title, I know, but it was my first Sirius/Remus fic ever, so it's special to me even though it isn't my favourite one I've done.