I've written about this event before on this site, but it's been a while. At a house I used to rent, I rigged up a slanted platform, 35° or so, that let me lay back and relax with my butt hanging over the shower pan. After 2 or 3 2-quart pre-cleans, expelled in the commode, I'd lie on my board and have some fun with the colon tubes.
I have one of those bags that let you run the shower all the time, keep a constant pressure head in the bag, and let the overflow go out a drain hose and into the shower drain. Also, it was summer here in Texas and the water out of the cold tap was just warm enough for a relaxing session. That particular evening, I'd taken a Viagra just to supercharge things, did my clean-outs, and laid down on the board with my third beer of the evening beside me. I was using my 50 inch tube that night, from the old Beth Tyler site. About 5/8" diameter IIRC, roughly 15mm or 45Fr. I slipped the tube into my lubed up ass, and it went in like it had a home. Some days you can't get it deep no matter what, some days you have to work for it, and some days are magic. This was a magic day.
In what seemed like one pass, I had the full length of the tube inside me. It felt like it was clear to my cecum. I've read that's not right, that the colon is longer than that. All I know is that's what it felt like. I relaxed my ass so the water could flow out and enjoyed what felt like a warm internal massage with the warm water going into me over in my ascending colon somewhere and then flowing out.
My cock was quivering and wanting attention so I took a swig of my beer and began stroking. I edged for a while and when I couldn't stand it any longer, went for the climax. I felt it coming on through my entire body, then it hit and the first spurt of cum landed on my chin, the second one hit me in the top of my chest. It was a full-body orgasm and I didn't want it to ever stop, so I kept stroking and it went on and on. It lasted so long that it became exquisite pain and I finally stopped stroking my cock. I laid there, trying to catch my breath as the sensations slowly died away.
I took a gulp of my beer, began to slowly pull the tube out, and damn near started the whole thing over again. My body was so sensitized that I twitched and quivered for the whole fifty inches as I pulled the tube from my ass. What I wouldn't give to experience an orgasm like that again.
I should have bought that house.