Embarrassing doctor visit
When I was a boy I took a small wire and slid it in the end of my penis. It hurt like hell but I was so horny it felt good. It felt so good that I ejaculated without even masterbating. I tried it a few more times when I was kid and had the same results, but then never did it again. Fast forward 30 years and I was diagnosed with kidney stones. I went in for surgery and had them removed. As a recovery process they inserted a sint in my ureter. Attach to it was a string that ran down my urethra and hung out. A few days later I returned to the office so the nurses could remove the sint. They explained they were going to pull on the string and the sint would come out. She took my penis in her hand and the string in her other. As she started to pull I got hard. She stopped and asked if I needed a moment. I told her I didn't and she should just pull it out fast. She grabbed my still hard penis and the string and started to pull again. I ejaculated as the sint came out oozing cum all over her hand. I was so embarrassed I tried to apologize. She told me not to worry about it, as it happens more than anyone knows.
I think it was cool how understanding she was. I'm sure it felt good, but I'm sure she knew you didn't really plan on that happening.