I get bored with Auscultation Role playing after a few hours. How do I avoid this?

Hi there. Sometimes I really crave for playing doctor with a partner that may last for a few hours. But I am someone who gets bored easily and this may also prevent me to play doctor. Are there any tips that you can give me to overcome this boredom? Even though I have a huge steth fetish, it seems that I cannot examine my partner for several hours.

The simple answer is don't do it for such a long time. You can have too much of a good thing.