My parents are out of town, and I was feeling pretty horny. I had been thinking about masturbating at school during the night for some time, but I never had the courage/time. But now, I had two full days to do whatever I wanted. I usually spend days like this just jerking off around the house, but I felt like I needed a new experience. To make the outing as good as possible, I didn't cum at all during the day. Instead, I masturbated until I felt I needed to, then stopped. 10 o'clock rolls around, and I'm extremely horny. I had just finished a Photoshop of a few hot friends naked, and prepared it on my phone to jerk off to. Now, I know that there would be security cameras at the school, so I packed a hat (couldn't find a mask) and wore baggy clothes. I was afraid it would be too cold, but the cool summer night was perfect. I drove down to my school, parked in a nearby neighborhood, and hopped a short fence into the football stadium. I had been planning my route of entry for some time, as much of the school is locked with tall gates. I hop into the stadium, and immediately take off my pants and underwear and put them in my bag. I ready up one of my favorite videos and get to work. It was the most amazing rush ever. Just taking off my clothes felt so naughty, and I already had a rock hard boner. I began jerking off, walking while watching the video. I paced around the field, and oh it felt so good. The warmth of my cock felt amazing against the cool air, and my whole lower body felt so free. Each stroke made me more excited, and I made my way up the bleachers. I went to the top, making a shit ton of noise as the steel creaked underneath my feet. At the top, I stood over the whole school, tugging at my cock and feeling so good. I then noticed a security camera aimed right at my path to the top of the bleachers. I got worried, but I knew it was too late to stop; I had to finish. I avoided the security camera on the way back down, taking care to keep my face hidden. I planned to walk across part of the school, masturbating as I went along. I wanted to make the experience last as long as possible, to savor the event. I slowly walked across the athletic fields, noticing that the gate to the actual school was wide open. I thought it wold be so fun to go down there and jerk off, but I decided against it. There were huge lights still on down there, and I was sure there were more cameras. Instead, I walked to the softball and running fields, where I used to do cross country myself. The night was pitch dark at this point, and I could only make out nearby shapes from the light of my phone. My excitement grew as I neared orgasm more and more frequently, stopping before each to keep going. I made my way to the tennis courts, furiously rubbing my cock, about to explode. I then got to the point where more than three strokes would cause me to cum, so i quickly switched from my video to the oh-so-sexy photo of my friends naked. Two tugs, and I felt it coming. I sped up, and suddenly my mind went into full ecstasy. I've masturbated many times, but never before had I felt anything like it. My cum shot out farther than it ever had. I went into semi-convulsions, my body contorted with each successive ejaculation. I stood there for a minute after, dumbfounded. I had never had an orgasm so good just from masturbation. I promptly realized where was, at exactly midnight. I suddenly felt as though I may get caught, so I quickly put on my clothes and sped out of the school the same way I came. I got in my car and headed home, feeling extremely relaxed. I may have gotten caught. I don't care at this point. All I care about is how good it felt.

TL;DR Snuck into school during the night, jerked off, security cameras may have caught me, had the best masturbation session of my life.