I've done a few self bondage enemas before. I used a spreader bar for my ankles suspended from the loft (attic for my transatlantic friends) by a long rope. My hands were chained to radiator pipes on either side of my hallway. I used chains that were long enough to reach the padlock but not long enough to reach the enema tubing.
I hung two bags connected by a Y connector. In one was 1.5 litres salt water. In the other was 1.5 litres lemon juice solution.
Above the Y connector on each individual hose I kinked the hose and passed a small O ring over the kink and then put a pencil between the hose and ring to hold it in place. This prevents the flow. Attached to the pencil I taped a long cord attached to a weight (I used a small water bottle). I attached another O ring to this string and passed it over a sticking with some ice in an then tied the stocking to the stair rail.
The release mechanism works so that when the ice melts the weight pulls the O ring through the stocking, pulling the cord that then pulls out the pencil. This releases the other O ring and allows the tube to un-kink. This then allows the enema to flow.
I did this for both bags, putting a bit more ice in the one for the lemon juice.
I use a similar mechanism for the key release except I directly pull the cord myself to bring the key to my hand so no weight is needed.
I lay out a couple of shower curtains and plastic sheeting on the floor and tape these down so as not to ruin my floor if I have any accidents.
I then got myself dressed in my rubber stockings, suspender belt, hood, posture collar, gloves and ballet boots.
I lock my ankles into the spreader bar and pull the rope to hoist my legs upwards. I tie the rope off to the bottom of the ladder.
Next I insert the double balloon nozzle and inflate it, then connect it up to the enema tube. I remove the clamp on the tube and throw it aside.
Finally I use the chains on the radiator pipes to lock to my wrist cuffs. That final click of the lock is fantastic but terrifying!
After a while I hear a crash as the weight on the salt water enema bag drops and in no time at all I feel it beginning to fill me. This is when I know I'm in it for real. It flows quite fast and at 1.5 litres isn't too taxing but I'm still very aware of it.
I'm not sure how much longer I wait but I am getting quite uncomfortable, both in terms of the enema and the bondage. I'm hoping my key is released soon.
Then crash again as te lemon juice is released. This is much more filling and adds cramps to the mix almost immediately.
By now I'm desperate to get out but the keys won't come, despite my tugging.
I estimate I had to hold three litres for another teeny to thirty minutes before the keys are released.
I fumble with the locks whilst the cramps keep hitting me. Eventually I get one hand and then the other free. I gingerly release the rope and lower my legs and try and unlock my ankles as best I can without putting too much pressure on my belly.
Then it's a mad dash to the toilet. Made even madder with ballet boots on!
I've inly done this a few times but it massive fun.