I make no secret that enemas are my first fetish and the one I probably practice the most. Here's some of my profile in italics for those that might not have read it with more details and explanations in bold. If this is too hard to read, leave a comment and I'll use some other formatting style.
A brief history: I have been doing self enemas since about age 13 when I happened across a 1960s nursing textbook that described the enema process in great detail with volumes, insertion technique and types. It might have been a mid 1950s nursing textbook, I wish I could find it again. It was one that had the transparent overlays that started with a skeleton, then added layers of organs & muscles in succession. I learned a lot from that book. It was something that intrigued me, even at the tender adolescent age, and I gravitated to it for some reason with eye-opening results. My early experiments were not conventional yet satisfying enough that I continue to this day, 40 years and counting.
My first rig was totally jury-rigged. I started with a gravity feed siphon arrangement of a 1/2 gallon milk carton to which I inserted an aquarium air line. That was clipped to it with a clothespin. At that time there was no nozzle and I quickly discovered the merits of a rounded end without a sharp edge on the clear plastic line. Still, I had that experience and only took a portion of the water which was too cool and immediately cramped me up. The house was empty and I hopped up on the toilet with explosive results.
From that time, I improved on my rigs, still using everyday items and re-purposing them for my budding kinky needs. I used two liter bottles with a hole drilled in the cap for a while. Those were easy to come by and I only needed my one cap with a hose to be ready.
As I got older, my desires waned a bit and I almost forgot about it. It wasn't until I was out on my own that I happened across a combination bag in Walgreens and purchased it on a whim. Not too long after that the Internet exploded and I found out I was not the only freak with a hose up my butt!
The rest, they say, is history!