Preston stopped by the clinic because he broke out in a rash this past week and he really wanted to get the advice of a medical professional on what he can do about it. He introduced himself to Dr. Phingerphuck and explained what he thought could be causing the rash. The doctor began the exam and then told Preston he needs to ejaculate into a jar so they can run a new experimental allergy test. The doctor stepped out and gave Preston his privacy. The young man began to get his dick really hard and saw it as a plus that he got to whack off today since he hasn't done it in some time.He was breathing heavy and loving the idea that he was jerking off on an exam table.He was stroking faster and faster then quickly reached over to grab the jar and started to spill his load into the jar. It was definitely the best way to test for allergies in Preston's opinion.