[nsfw] Bitzuri, Etna Ride Re-SFX'd, and Pivot Dive

Bit finally does a paizuri!

Additionally, I've decided to redo the audio for the Etna Ride animation! I had done a pass of it previously a while back, but grew unsatisfied with it so I have re-rendered it with some updated audio. Both of these as full res are in the zip.

Also a doodle of Pivot for warmup