One of my five GF (too young to have been part of the golden age as a child) who agreed on some enemas involvement just agreed on bringing relief for my IBS pains.
She had only a very limited idea of what an enema is, if any, so I had to explain and she did follow my instructions. The first attempt was not too bad, but she was afraid of doing something wrong, and I had to reexplain things on a step by step basis while she was "on duty" : inserting the tip, positioning the bag, etc...
After some months and several enema sessions, she had seriously improved her knowledge and had become both very efficient and quite gentle and pampering at the same time. I was expecting her to be curious and to be asking for some reciprocity, but she never raised the point. I decided to try my luck, as softly as possible.
While she was preparing for one session that I had requested, getting all bits togther, I simply asked her if she did not felt it a boring -if not unpleasant- job she had no choice but to perform for bringing relief to her boyfriend.
I was expecting she would reply by asking one try in return, hoping that she would not say "it is just a pain in the ass, but I am doing my best for you".
None of these answers : she just told me that it brought her with a sense of intimacy she never had before with any other man. As she was in her late 30 and had been married before, and told me briefly about some of her boyfriends, she was able to benchmark her feelings !
I suggested that she should explain, still expecting some more curiosity, but she only told me that she was unable to explain : just a very special feeling.
That was it and it never went any further.
Each case is a unique one.