This image is unavailable on Donmai. Go to Danbooru or disable safe mode to view (learn more).
Artist's commentary
I have discovered a nice watering hole
To be able to violate her Master's urethra, urinary bladder and the insides of his balls is pretty Suu-per. First cross-section. Darn difficult. I don't get it. I realized as I was researching how to draw a cross-section for the area around the penis, how surprisingly confusing it was. Sleeping habit, I had thought the penis's urethra was directly connected to the balls