I've been playing again with the anoscope & endoscope, but this time I also used a catheter to put cum lube right into my bladder, then stuck the endoscope in to look at it. First I used the anoscope in my peehole to take a very close look at my bladder sphincter and then showed the catheter going right inside. Given how much my urethra and bladder sphincter can stretch, isn't it interesting to see how tight it closes around the catheter? I put a huge syringe full of cum lube into my bladder, then put the endoscope in too. Inside my bladder, the opening to one of my ureters is visible, and ... Show more