Are you going to be a good baby for your nurse today? I plan to put a lot of fun stuff in your bottom (for medical reasons, of course) but first, I have to put on my shiny latex gloves. Then I can get you ready for your diaper, enema, and butt plug. If you want to be a fussy baby about any of my plans for you then I can just demonstrate some of my favorite punishments for naughty patients.
I find that few things make bratty boys feel more submissive and vulnerable than being fucked on their open diaper while trying to hold an enema.