... that is, the end farthest inside you gets the hole drilled in it. Twist the felt tip plastic end away from the main shell and remove the felt and tip from the parts leaving them empty. Twist the parts back together. The small tit that holds the felt tip is perfect for fitting a hose tightly onto it and hooking up an aquarium pump to inflate your bag
Yeah dude, use that pen, drill a hole in the end of it and stick a clear plastic hose into it. That will stay inside your pisshole end and you can feel all the sensations even more