Holding large volumes started as a game between Sis and I around our early teens. Having been given enemas from our earliest memories by our mom, our aunt, and sometimes our grandma, we naturally moved to loving them. Since they were given to us naked, together in Mom's huge bathroom (it was a very old house), we just naturally evolved into doing each other for fun. We started by playing with the 4 oz. children's bulb in the bathtub. Of course, before long Sis proposed adding extra bulbs full in our play sessions. We would play this game while Mom was at work, and always in her big clawfooted bathtub. (It seemed like a swimming pool at the time.) We just filled the bulb from the bathwater, and took turns squirting it into each other until one cried uncle.I have no idea how much we were taking, but always tried to hold it until the pain was bad. I seem to remember getting to 10 bulbs before we decided (around 16) to switch to Mom's 4 qt bags. Four qt bags were common back then, and you could buy them at the corner drugstore.
By then, our regularly scheduled enemas were given with these bags, and Mom had two, so she could do us together at once. She started with 1 qt, and over time, increased us to 4 in out late teens. She always took 4 herself, as did our aunt. So, we started with 2 qts in this game, and worked up to 6 over time. To do this, we filled both bags, and switched when the first bag was empty. Now, neither of us get to feeling the pleasures of fullness until we have 5 qts. Sis has taken 8 on several occasions. I cannot make it to 7. We both credit 70+ yers for soapy water with our stretched colons, and we are both totally dependent on enemas. Frankly, I get max pleasure at about 5 1/2 qts. Any more is just to prove I can take it.