So I heard Dr. Barr recently return from his vacation and just wanted to stop by and say hello and maybe grab a sandwich for him since I knew he'd be busy. He was really happy to see me and was curious about the fleshjacks on the table. I explained we use them to extract sperm samples and that those had just come out of the sanitizer.  Without skipping a beat he asked if I could demonstrate it on him. Since I had an hour lunch, I figure what the heck right? Dr. Barr strips down and starts working on his bone while I lock the door so no one would enter. I explained how the thing works and it's was a go for him. He squirmed as I teased the head of his uncut dick. With every thrust of his hips I could see him enjoying every second of it. Once I knew he had enough I finished him off with my world famous hand job.