Ejaculated prematurely in my pants at an exam hall.

So this happened about two years ago during my final year, and it’s still easily the most embarrassing thing that’s ever happened to me. I’m a CS major, so my life is basically just labs, and staring at code. I’ve always been a bit of a nerd and I don’t really have much of a social life. I don’t even masturbate that often—it’s just not really on my mind. Usually, my body just handles things with a wet dream every few weeks, so I’m naturally super sensitive, but I never expected it to just betray me in the middle of a final. The exam hall was packed and dead silent. I was wearing these regular slim-fit chinos, but they were fitting way too tight. I was hunched over my desk focusing on the paper, and the way I was sitting meant the fabric was constantly pressing and rubbing against me every time I moved a bit in my seat. To make things worse, there were a few really hot girls. I’m pretty shy, but the stress of the test and the adrenaline started doing something to my head. I wasn't even trying to look at them, but I realized I was getting a massive, rock-hard boner. Since I rarely ever have a release, the constant rubbing from my pants was getting to be way too much. I tried to move a bit to ease things off, but every little wiggle just made it worse. I tried so hard to force my brain to stay on the test questions, but I couldn't think about anything except how insanely sensitive I was down there. I reached under the desk to try pull the fabric away, just hoping to get some relief. That was a huge fuck up. The second I moved the cloth my dick twitched like crazy and I felt a huge wave of cum oozing out. I completely froze. I was sitting in a room where you could hear a pin drop, just paralyzed, as wave after wave I was leaking into my pants. It was so much more intense than any wet dreams I've had as I was wide awake and terrified of someone noticing. Those chinos are pretty thin, and it went straight through my underwear and made a visible dark patch on the crotch. I couldn't even finish the exam. I was so panicked I couldn't even read the questions anymore. I waited until a group of people stood up to turn in their papers, then I grabbed my laptop bag and covered myself. I handed over my paper and rushed for the nearest washroom. I spent forever in a stall feeling like the biggest idiot on campus. I ended up barely passing that test.