The enema experience is different for all but I thought of things to do or to be done to you while holding an enema. So I made a list which appears below. Feel free to comment or add. Some of the things are obvious and perhaps some are not but all are intended to enhance your pleasure whatever that is.
Sex with your partner (or yourself) and perhaps no expulsion till she or he is satisfied.
Corner time with or without restraints.
Walking around holding your enema bag.
Watching yourself and your distention in a mirror.
Having a plug inserted and getting dressed and going for a walk.
Being made to discuss your bowel habits and need for enemas or getting a stern lecture about them.
Getting a nozzle treatment such as moving the nozzle in and out.
Inserting a rectal vibrator.
Setting a timer and waiting for the bell to be allowed to go.
Sitting on the toilet and holding for a specified time.
Talking on the phone knowing you are holding or the other on the phone knows.
Getting on Zity.
Making a video of you getting and watching later (be sure to erase lol).
Looking at the full enema bag and knowing you are getting another.