I like all of it especially watching a good and thorough Vaseline-ing.
In addition I like to watch as an enema bone or nozzle is inserted into a well lubed bottom cavity.
I miss seeing more of the waiting time after the bowels have been filled with warm suds. I wish they would show more of that. To me, seeing a nude young lady or young man squirming on a bed while their bowels are distended with suds is very erotic.
What part(s) of an enema video is the most exciting for you ?