You can't just pull out a catheter because it is held in place inside the bladder by a small balloon filled with sterile water, which needs to be deflated first using a syringe before gently removing the catheter; pulling it out without deflating the balloon can cause discomfort, pain, and potential damage to the urethra or bladder wall.
It’s the medical stuff that I like to geek about
y’know how in a/b/o stories, alphas have a knot to keep their dick inside the omega when cumming to make sure everything stays in? Catheters have a “knot” too. It is stuck inside until it’s deflated. Pull it out without deflating it and congrats, you have ripped your piss hole (●'◡'●)ノ
It’s like reverse sounding.
Depending on how long he was unconscious, it’s probably more likely that he used a catheter simply because people who are unconscious for awhile need one (because how else are they gonna empty their bladder) and not as a way of preventing his escape. There are many other, easier ways of preventing escape lol
The fact that the Uke can’t pull out the catheter because the catheter is actually held in place by inflating a small balloon. It’s really the small details tbh