The trick is to make your partner hold their enema as long as they possibly can, so as to get the full benefit of pleasurable cramping, strong urges, and poo softening, , yet not cause them actual pain. I find it very difficult to tell whether the person wailing of “I've got to poo…. NOW!” really means it, or if it's part of the experience and is soliciting a response like “Sweetie, you've not held your enema nearly long enough to work properly. You have at least 5 more minutes.”
In answer to the OP‘s query, I’d say “Oh my Lord YES!!!! A big long eventful mandatory enema hold enforced by my partner (e.g., ex-wife Switch Domme) for me is at least half the fun. To Sean’s first line above, I’d agree and just add the additional full benefit of feeling and seeing the big volume, distention and water weight of a nice substantial enema, usually 3.5-4.5 quarts. And also, at least for us and any other D/s enema lovers, the further benefit of submission, embarrassment and even if you like, humiliation from both the enema and our mutual comments, conversation, noises and other kinky clothing and accessories she’d dress me in for my enemas (primarily rubber and latex).
With my ex being my Domme, after making me dress or wear our fetish clothing and accessories (latex suit, hood, gloves, rubber sneakers, etc.) to start my submission and arousal, she’d wind up making me hold the first enema about an hour, then add the second on top of my first, and hold the double enema till the end of that evening or session. My usual hold time for both enemas was 2-4 hours, with release and emptying after our orgasms before sleeping. On rare occasion she’d make me continue holding the double enema even after our orgasms until the next morning, making it a 6-8 hour enema hold.
Eric