Wow, just hearing the words “probed by the doctor’s thick finger” is enough to take me from 0 to 100! The forced aspect by a 3rd party of this fantasy really adds to it as well.
I find the control and power dynamic of the fantasies I have so interesting - but even more interesting, the fact that others share them! I can only imagine the pleasure of having a menthol lubed, thick finger slipped forcibly into my rear end, all the way in and twisted around. Whew!