After a short time, the doc embarked the process of taking off the beef whistle pump. In doing so, once my prick was out of the tube it was only fatter in size was all I could tell. Using a bit more lube, the doc went back to masturbating my cock. Looking over at Jacob he told him to get unclothed while he moved on to the next experiment with me. Jacob was swift to get bare and took a seat back into the chair. Dr. Dick told him to commence to use the knob pump on himself while he started some electricity on me. Jacob oiled up his lollipop pumped his meatpipe slowly with the device. My manstick was getting shocked and the longer it went on, my rod started to shrink in size. But, it felt great! Jacob's man sausage on the other mitt was thick in that tube. The doc moved on to wanting to get a sample from me, so he used lots of lubes, and wanked me off pretty quick just like I do at home. He had Jacob play with my ball-sac at the same time. He told us both to do our own thing and to give him a sample when we could. The 2 of us looked at each other, and it was hot.