While I seem to have a hard time remembering early experiences, I certainly do recall THIS one. I had met a guy online (probably Compuserve, since this was so long ago) and found out he was into enemas. I have had a lifelong fascination with them, but my partner isn't into them at all, so I was quite glad to meet someone who was REALLY into both giving and receiving them.
His name was Dave, and he was GOOD. I found out why--he was an X-ray technician at the local VA hospital. So of course he had a lot of experience giving enemas, especially barium ones, for X-ray exams. Talk about loving your work! And since he was gay, and nearly all of the patients were male, this must have seemed like heaven to him.
He came over one night to our apartment to play and brought along his gear. I went into the bedroom with him and closed the door for some privacy. I desperately wish I could remember every detail, but I just know that at some point both of us were naked and I was face-down on the bed. Suddenly I felt this AMAZING sensation on my anus, and I nearly jumped out of bed from the shock! I was so naive that I had never been exposed to anilingus before, and I was both turned on by how it felt and grossed out by what he was doing. (Luckily I have always insisted on being clean "down there" before any sex play, and this time was no exception.)
Soon he went into the adjoining bathroom, and I heard water running for awhile. I was dying to see what was happening but he had closed the door, probably to amp up my anticipation. He told me to close my eyes and relax, then I felt something slippery being applied to my hole. I felt the smooth nozzle sliding in, and heard a "click" as the clamp was released. Since it was my first time he made sure to go slowly, letting me get used to the feeling. I gradually started to feel more and more full, and was getting more aroused by the second. Eventually I knew I was about to reach the bursting point and I scrambled to the bathroom to let it out.
I was SO ready to have Dave do this that I had gone out a few days before to buy an IV pole, telling the clerk that I was into high-tech decor and wanted to use the pole for hanging plants. To this day I wonder if he really believed my story! I was so grateful to Dave for my "first time" that I ended up giving him the pole to take home, since he didn't have one at his house.
I think we played a couple of more times, but then he and his partner moved away and I never heard from them again. I never found another guy who was into enemas...until recently, when my long-buried interest came back in full force and I found another great playmate. But that's another story...