I was experiencing some pain and muscle tension in my legs, and went back to the clinic for another visit when Dr. Topinbottom wanted me to come back in. The nice thing about only being in the day before was that the Nurse was able to take me right to the exam room and I didn't have to wait for every long. The Doc came in and asked how things were after the exam the day before. I told him better, but still experienced the pain. Topinbottom told me that he wanted to try something a little more intense. That involved electro stimulation, and it sounded really interesting. The first thing that I had to do was strip out of my clothing to my underwear. Sitting back on the table he was going to gave me a little experiment before doing the real thing. Dr. Topinbottom applied both pads to one of my legs and turned on the machine. It took a moment for the muscles in my leg to contract and the Doc experimented with a couple of different levels. When he was ready he turned off the machine and had me remove my underwear. Taking a seat on the table, the Doc applied some lube to my dick very evenly, and applied two straps around my dick. With that he turned the machine back on and it started to send these electroshock waves through my dick. It didn't feel to bad, just a little odd. I had to tell him when the sensation got a little too strong for my liking and he turned it back down. The longer the machine was on, the harder my dick seemed to get on its own with no touching it. Dr. Topinbottom told me that he had another device that he wanted to use as well. Reaching behind the table, Dr. Toppnbottom pulled out this toy and showed it to me. This one was going to connect to the machine as well, but the difference was that it was going to go in my ass. It was funny that the Doc used professional words to say it, because I would have just said that the machine was just going to fuck me. Getting into a more comfortable position on the exam table, Dr. Topinbottom inserted the toy in my ass very slowly and once the toy was in, he made sure that things were okay before he continued. It was just an odd feeling that I wasn't used to feeling. Turning a dial on this machine, I couldn't feel anything for a while, and he just kept asking me how it felt. Then, all of a sudden this shock feeling sent my body in a jump, causing me to grab the table. It took a couple of different attempts, but things did get to the right level. After a while the Doc decided that he was going to remove the one from my cock and just go to manual stimulation instead. He applied some lube to his hand and started to massage my cock with his hand. I do have to admit that it felt really good to have my cock played with, while my ass was getting shocked by that little dildo in my butt. The longer that the Doc stroked my cock the harder it seemed to get. It was great, because it was a building feeling that just kept getting stronger the longer things continued. All of a sudden I felt like I was going to cum, and that was not like me. I even had to question it, because it always takes me a while to get off by jerking. It seemed that the electro stimulation seemed to make the difference. I gave him a warning and then I came shooting my load all over myself and the Doc just kept pumping my dick getting every drop of cum out. Removing the device from my ass, the Doc still asked me to come back in one week for a check up exam.