Jacob and I went back to the clinic, because we wanted a chance to make some extra cash doing something easy. At least that was what the Doc told us the last time we were in there, and I was getting my foot examined. The nurse took us back to the same exam room that we were in the last time we were there. Sitting there we waited, but not for long when Dr. Richard walked in. He told us that Dr. Phingerphuk had an emergency that he had to attend to, and that he would be seeing us for the experiment. The doc introduced himself, and made the joke that he preferred to be called Dr. Dick. We told him a little about us, and that we mainly was in because of my foot. Moving up on the table, the doc took a look at my foot and touched it a couple of different spots for any tenderness. Dr. Dick had me take off my shirt to listen to my heart and lungs. I stood up and the doc had me take off my pants and stand for a moment. He examined my chest, and noticed that I had a couple of sun spots. I heard a lecture about sun screen, and then he put on a pair of gloves. As the gloves were put on, he apologized for the noise going on outside with the lawn. Dr. Dick had Jacob stand up out of the chair and help pull down my underwear as he examined my cock and pubic area. Jacob stood there as the doc touched around the shaft of my cock. I had to do the famous turn and cough for the doc as usual. Then, I was told to take a seat, and he palpated my chest for any tender spots. Moving down to my dick, he told me that getting hard was nothing out of the ordinary. With my cock getting fully hard, he even wanted to take some measurements of it. Wanting to get started with the experiments he started with a penis pump. He used a little lube to make me a little harder before taking another measurement. Putting the pump over my dick, once it was all the way inside he started to squeeze this gun. As the air was sucked out of the tube, I was watching my cock grow in size. The feeling was that my cock was getting hard, and seemed to get more sensitive the bigger it got. The doc told me that he would leave it on for a moment before continuing. Jacob's eyes were glued to my dick in the tube, and I could tell that he liked what he saw. The doc explained how it worked and what was going on. After a short time, the doc began the process of taking off the penis pump. In doing so, once my cock was out of the tube it was only thicker in size was all I could tell. Using a bit more lube, the doc went back to stroking my cock. Looking over at Jacob he told him to get undressed while he moved on to the next experiment with me. Jacob was quick to get naked and took a seat back into the chair. Dr. Dick told him to start to use the penis pump on himself while he started some electro-stimulation on me. Jacob lubed up his cock pumped his dick slowly with the device. My dick was getting shocked and the longer it went on, my dick started to shrink in size. But, it felt great! Jacob's dick on the other hand was huge in that tube. The doc moved on to wanting to get a sample from me, so he used lots of lubes, and stroked me off pretty fast just like I do at home. He had Jacob play with my balls at the same time. He told us both to do our own thing and to give him a sample when we could. The two of us looked at each other, and it was hot. Jacob whispered that he was getting close to cumming. He moved in closer to the table, and shot his load on my leg. Jacob came a huge load on the table and me, and now put the pressure on me to getting off. He knew that I was having some trouble getting off, and that it was taking a while. Walking up to me, he started to kiss my neck, and lick my upper body. Just what I liked when we messed around at home, or in the car. It really gets me turned on when he sucks on my ears. The cum shot out of me like a cannon and I couldn't hold it back. I came exploding on my chest. I was happy to see that I had that much cum. The doc said we did a great job, and that we were going to get paid.