Yesterday I went to hospital for cancer treatment on my bladder, it was the last one of six and I was looking forward to it being over. The same nurse had been doing it every week I was there and we laughed and joked about what she had to do. I got there a bit early, hoping she would do it early, I checked in at reception and was told to take a seat, I wasn't sitting long when the nurse called me. We went into the room and she closed the door and locked it, which she hadn't done before. She told me to get on the bed, and give my bum a slap, she hadn't done that before, so I got onto the bed laughing. She said pull your trousers down like you have done before, so I did. She got the trolley ready and turned and said it is a bit small today, so I told her it was hiding from her, she said it is too small to put the jelly to kill the pain before she drained my bladder, I was about to say, do you want me to rub it to make it bigger, but her hand was already there and she gave it two tugs and it started to get bigger, but it didn't stop, it kept getting bigger till it was full size. She looked at it and said it shouldn't have got that big from what I did. She then said it was too big to put the jelly and we would have to wait till it went down a bit. I said, who what a waste and laughed, it didn't seem to be going down, so she said we need to get it down and she took it in her hand and started to rub it, I was shocked at what she was doing, she said, this will get it down and rubbed some more, it felt good and must have make a noise, she looked at me and laughed, I could feel my cum building up and I knew I was going to cum anytime now. She laughed again and the spunk shot all over the place, over me and over her, she stopped laughing as she cleaned herself up and handed me a tissue to clean myself. It then started to go down, she said that is good we can get on now, she drained my bladder and pumped in the liquid and remined me I had to keep it in for over an hour, then said you can get up now, I got off the bed and was doing my trousers up, when she said we don't normally do that, but I was in a rush, I just looked round and said, I wish you had done that the five times I had been there before, she went red and said I could go and that they would contact me for a check up in about a month. I must have walked out of there with the biggest smile on my face.