I first used a pack sack with an enclosed enema bag on a camping trip with my college sweetheart. I filled a closed top enema bag with warm soap sudsy water ..put it in a packsack ..made a hole in the packsack to allow the tubing to get out..then inserted a well lubed nozzle in my gf,s sexy ass. I used surgical tape to secure the nozzle in place. She was naked from the waist down except for her hiking boots.
Slowed the water flow to enjoy watching her walk with the tube between her round smooth nether cheeks.
She told me it felt the suds were sloshing around inside !!! (Like they do in a washing machine )
I was so turned on by the sight of her ass in motion as her bowels filled with the soapy enema !
I repeated what I refer to as "doing the wash" indoors with other emates over the years. Powerfully erotic ! I just love the look she gave me of pain/extasy as her bowels slowly filled with the large warm soapy .
On certain occasions I have used some light restraints on hands and arms to reinforce the notion that she is "made to take it ".