French Trombone

When a girl on her knees below a male and blows into his asshole while reaching around and giving him a hand-job at the same time.

It is a brass instrument. It has a slide, but is also nearly impossible to play. Instead of a trigger, it has a valve to change the key signature. It is high brass and the embouchure is incredibly hard to master. Luckily, it can also go very low unlike the normal French Horn, but can also go very high unlike the Trombone. Normally the people who play it have to be incredibly determined, but also have a sense of humor. Without those two traits, it is hard to keep persistent with it. It is a cursed amalgamation of two pretty cool instruments.

A paperclip