Jerking in the Computer Lab

One day I got out of votech, i was 20 at the time and still living with mom. I called her and asked her if I could go to the library after school, her car her rules, she said yes. I got there and went upstairs and went into their little "private" computer lab whick had about a dozen computers in it. At the time I had a phone that had internet, but I didn't want my mom looking through it. So, my girlfriend at the time sent me nudes of her to my phone, then I emailed those pictures to myself to get to later. The little lab I was in had about six people at the time all spread out, I was about the middle and the computers had little privacy screens so nobody can see what you are doing. I brought up those pictures and got an instant boner. I was wearing basketball shorts at the time and started stroking my dick outside of them. I kept stroking, knowing I could have been caught was an amazing feeling. I didn't last five minutes before I blew my load in my shorts and boxers. This wasn't my first time jerking off in public, and this will not be my last time either.