I've tied myself up with enemas since I was in my teens.
At one point, I owned and older house. In the kitchen were two radiator heating pipes, one on either side of the room. I developed a system for tying myself up, with ropes on my feet to one pipe and tight rope loops around my wrists and padlocked to a rope on the other pipe. I had a key on a long, long string so I could (eventually) unlock the padlock.
I was into taking gallon enemas by then. I would wear a long leg, all in one, panty corselet, with gartered stockings. I would attach an old fashioned, multi-directional spray, vaginal douche nozzle to my enema hose, run the hose up the panty leg and insert it in me. The corselet held the nozzle firmly in me. I set the gallon jug, high on the kitchen counter. I had a system where another long string looped through the enema release clip. In some cases, I would tie the key release string to the enema release string: thus if I wanted to get free, I would first have to pull the enema release! I would fill the gallon jug with uncomfortably warm water, often soapy too.
And there I would be, tied and padlocked to the floor, with no escape but to pull the release on the punishment enema! I often imagine myself being the innocent victim. For my fantasies, this was always sort of simulated sex, simulated rape. But if I really wanted a punishment, with really hot water, I found I could not just pull the enema release and have the hot water instantly flow into me. The pain was instantly too intense. My mind and body resisted.
One day, in an old camera shop, I came across an old fashioned, mechanical, camera shutter release. It was on a six foot long cable and had a metal plunger, controlled by a spring, with a 30 second mechanical timer. This was just what I needed! Too bad it wasn't a little longer. From my enema jug to me, it would reach to about the middle of my belly. But I could get all set up on the floor, trigger the release and have 30 seconds to lock my hands above my head. The 30 seconds was also long enough for me to disassociate my triggering the timer to the beginning of pain from the punishment enema! I made sure my padlock release key was on a very, very long string so it was unlikely I could retrieve the key before the enema flowed into me!
My one "complaint" about this set up was that I was not really helpless: I could focus on retrieving the key, not just suffering helplessly. Still I got some really punishing enemas out of that set up.
Too bad this was way before inexpensive video cameras. Eventually, the camera timer broke. I sold the house. I don't have a way to lock myself up like that anymore. Also, I am not so much into really painful enemas anymore.
(SIGH!)
The good old days!
Guzzleguzzle Kid