I bought a urethral sounding kit and just got it in the mail today. A set of nine stainless steel rods in a leather casing, all built tough to stick deep into my pisshole! Never really done this sort of thing before; I'm a bit nervous, honestly. The thickest of the rods is 20mms thick (for reference, as thick as my thumb)! All the same, I'm actually kind of excited at the thought of making it to that thick one.
Wish me luck.
Oh, also quick artist update: I've been working on an image set of August in a maid outfit. I'm hoping to get that all done and posted by the end of the weekend.