I put not just a standard sharpie marker in my peehole, but also a big chisel-tip sharpie and even one of the huge magnum industrial markers! First, I put half a duckbill speculum in my cunt, so that you can see exactly where those markers are going. I start out with a regular-size fine tip sharpie, and it's no challenge at all, but it still feels pretty good pushing past my bladder sphincter. Then it's on to a fat chisel-tip sharpie, but my urethra is far from satisfied. When I grab the enormous magnum sharpie, you'll hear me talk about how the blunt end makes it much more difficult to insert, and you'll see how I have to work harder to get it all the way in. The effort is worth it, though, because it also makes me cum hard! When I remove it, there's a gush of piss, and I let myself pee a little more as I relax after my orgasm.