I received an enema from a friend of my mothers when I was about 11 while staying at her house while my parents were out of town. She used an enema bag, which was the first time I had received an enema from a bag. I hadn't recevied an enema for several years, and even then my Mom used a small bulb and only gave me a few ounces.
She took me upstairs to a spare bedroom and gave me the enema while I was laying on my side on the bed. I'm guessing it was close to a quart since the bag was about half full.
It doesn't seem like a lot now, but at the time I had a hard time holding it. I remember that I couldn't believe that she expected me to take so much, and I kept expecting her to quit at some point. She clamped and unclamped the tubing a couple of times when I really starting cramping, but she was determined to give me all of it, which she did.
I stayed with her about once a month whenever my parents went up to some farm property they owned. She always let me eat all the junk food I wanted, which always constipated me. My mom apparently threatened not to let her keep me anymore if I came back constipated everytime. She and her husband didn't have any kids and they really loved for me to come visit. She told me I could take an enema on the day before my parents came home, or I couldn't eat anymore junk at her house. I was always too weak to resist all the sweet stuff she kept around, and so always had to have the enema.
I had pretty much forgotten about the enemas she gave me until I received some enemas in the hospital when I was in my early twenties. Those were given by a middle aged female nurse and brought back memories of receiving the earlier enemas. That's when I became interested in enemas.