I love the whole thing.
I love going to our S&M room and selecting the bag and type of nozzle or tube, lingering over the selection, telling my husband his time has come, positioning him on the bed, bathroom floor, restraining him if necessary, squeezing the lubricant out of the bottle onto my fingers, rubbing it all over all his bottom parts, feeling my fingers slide smoothly and effortlessly over and into his body, lubricating the nozzle or tube, inserting the tube either teasingly or in one deft definitive motion, positioning the nozzle and inflating the balloons or snaking the colon tube far up his behind, feeling the tube advance along his colon with my hands through his abdominal wall, clicking open the clamp to allow the water to flow through his body, sometimes seeing him squirm as the water flows, other times seeing him take his quarts like a champ, grasping hold of his inflating cock, licking it softly at first, then positioning myself to completely swallow his penis as his colon fills, watching his abdomen swell and become turgid, seeing his face as he gets ready to cum, feeling him cum either in my pussy, hand, tits or mouth, making him hold the enema until I'm ready (or until he is ready to release it if I'm feeling benevolent), removing the tube, especially a colon tube, which I may do slowly and with short re-insertions or with one fairly quick recoil, making him expel as I monitor his progress and finally, making sure he cleans up well and showers. . . . and then violating each other again and again in the most vile ways imaginable.