Never been caught..but definitely had so many close calls throughout the years. One in particular from college comes to mind...
It was my Freshman year. My desk faced the door to the room, which definitely prevented a lot of embarrassing situations. I was working on a paper and my roommate was (supposedly) gone for the afternoon. So, I decided to take a little break and pulled up the good ol' porn file. I slid my shorts down to my ankles and started getting down to business. I don't recall specifics, but do know that I was watching something really good. A go-to video at the time that would always make me cum extra hard. I was right at the edge of bursting when I heard the door handle jiggle and a set of keys from outside. I paused the video and quickly pulled my shorts up as best as I could before the door opened. Unfortunately, I was past the point of no return and, as I stood up to pull up my shorts, a stream of cum shot onto my desk with a loud grunt, and the rest of the big load ended up in my shorts and running down my leg. Fortunately my roommate had some trouble getting the door open so I had a brief moment to regain some composure before he walked in. He was joined by two girls that are in a few classes with us. Thankfully they stayed by the door, but my roommate walked over toward my desk to grab a book off the shelf, bent down, stopped for a moment, did a gentle sniff of the air, then looked over at me and chuckled, patted me on the back and walked out of the room.