The situation in which I’d instruct a giver on how to make an enema more sensual, as I think the OP intended, has never arisen for me, although that’s quite a flight of fancy for my imagination.
I’ve only ever been bold enough to ask anyone for an enema when in legitimate medical need, and that circumstance has always had me focused on what would lessen or avoid pain and make the enema more productive.
It took me years even to think of giving instructions; I lived through a number of very uncomfortable and downright painful enemas from my nonpracticing physician ex-husband for my IBS-C with abdominal pain and nausea. Telling him how to do something he’d had professional training on and done in the workplace, and that he was doing to help me when I was in great need felt wrong at the time, although in retrospect I wish I had because the cramping and long, painful expulsions bordered on traumatic.
My next experience was night-and-day. I taught my giver how to mix and administer, although he had some expertise in the realm from taking small medicated enemas for his inflammatory bowel disease. The teaching phase was brief, and he quickly began communicating with me during proceedings to check in and see how he could make the experience better for me.
We hit a point where my giver could simply read my expressions and feel the tension in my body and know exactly what to do. There was a massage he did to bring water through the right-sided spasms I tend to get, and another to fill and empty my caecum, both of which I still cannot quite replicate, although I wish I could.
My giver also became expert in getting me through a few rounds of cramps by rubbing my back or abdomen while rocking my hip to take tension off my belly. His enemas are still among the most comfortable and productive I’ve ever received, and once our communication became nearly non-verbal but left nothing to be desired, I felt supremely cared for.
More recently I had the need to teach my husband to administer, once, as I recovered from abdominal surgery. He was clearly icked out but willing to help, and his efforts worked to restart my bowel after more than a week of no action. The only remotely sensual part of that was his lube job, which felt great despite my gut and incision pain. The rest was all business, and gauging his level of discomfort with the procedure, I would only ever ask again in similarly dire circumstances.
Communication is definitely necessary at first to ensure a good clinical enema, but the best is when all a partner needs is your nonverbal cues to do exactly the right thing. I imagine it would work much the same for a sensual enema.