Im your new doctor!! Nice to meet you! Today i see you’ve come in for a prostate exam. Some troubles cumming? No worries! Very common. I will give you a proper examination and assess your prostate! Lay down and get comfortable, I’ll be right with you! 
Once I get the tools, and toys I need I come back to see my new patient ready for me, time to get up close and personal! 
I put on Latex gloves before starting and lube up my fingers for the comfort of the process, encouraging him and explaining everything as I begin! I reach inside of him with my index, slowly sliding in reaching for him prostate! It sure is deep! I’ll need to add another finger! I encourage him as I open him up more and put to fingers inside to better assess his prostate! After a moment I notice he needs to be more aroused for me to properly assess, but also notice he’s hard already, so this should be easy, a prostate massage and I feel his prostate swell as I reach deeper, but he cums! All over my hand! Well I guess he doesn’t have a problem cumming! 
I make him lick off the cum from my latex gloves an change out into a new pair and start working on him again, this time stretching him more for my final examination! Once I see he can handle three fingers I go and change out into some white latex gloves and return with a strap on. Here is where I can finally asses his prostate and fully examine him! 
I fuck him relentlessly, using my strap on to really stimulate the prostate, and before I know it he shoots a load of cum all over my face!!! Of course I am shocked, yet proud of his healthy prostate! I urge him to lean the mess as I wipe it from my face and clean up getting ready for my next patient!