This actually happened 4 or 5 years ago.
I was living in a hotel while I was attending secondary school for the military and my boyfriend was visiting for the weekend. He had a mild case of tinea versicolor so he asked me to cover his chest and back with some Sulsun Blue. I happily agreed, he got naked and I got to rubbing.
After he was fully coated in Selsun Blue, I got on my knees in front of him. Naturally he got excited BUT instead of things getting sexy, I tried to be funny because I’m painfully awkward.
I grabbed his dick, looked up at him and said, “wouldn’t it be fun if I played your dick like a trumpet?” Like a good sport, he pretended to laugh at my attempt of a joke and I started my musical.
I moved my face closer to his head and began making the trumpet noise while pushing the imaginary trumpet buttons on his shaft.
This is where I really fucked up. I was having too much fun, got carried away and my mouth accidentally made contact. Next thing I know, I felt an air bubble traveling through his shaft and he let out the loudest screech I have ever heard. I couldn’t process what just happened as he fell onto the bed writhing in pain. He was left squirming and moaning (not good moaning) for about 10 minutes. I’m pretty sure there were a couple of tears that fell from his eyes. I felt HORRIBLE. I thought I ruined this man’s penis forever and if I didn’t, I thought he would never let me get close to it again.
When the pain finally subsided, I told him how sorry I was and he forgave me. We laughed at the events that just transpired and agreed that I was never allowed to play with dick instruments ever again.
He ended up marrying me a couple of years later, so maybe dick instruments aren’t really that bad.
TLDR: while attempting to be sexy, I pretended my boyfriends penis was a trumpet and accidentally blew an air bubble into his dick causing him EXTREME pain.