Public Bathroom J/O

When I was 21 I attended a trade school in Florida, we would have classes for 6 hours a day and basically stay in the same room all day long, there was a bathroom right across the hall with about 8 stalls and the same amount of urinals. One day I when I had to use the restroom, I decided to use the last stall just by chance, there was no one else in there at the time. I opened the door, sat down and began staring at the door, when I saw what appeared to be a cum stain right in front of me! It had the tell-tale signs of cum - slightly white and chalky, large at the top and a long drip down the door that extended about 10 inches, nice and solid! It looked like someone blew a large load! I was really surprised at first, I had never masturbated in a public place before and the thought of it began to excite me. My cock jumped to attention right away! I began imagining the person who sat here before me and jerked off to an orgasm on that door, this got me so horny that I had to start stroking my cock, I looked under the stalls to make sure no one else was there and then went to it! I sat back and rubbed my cock a lot faster than I normally do in the beginning... I was so aroused I wanted to shoot my load just like the guy who left that stain. I was getting very close to cumming and stood up so I could shoot my cum right next to his and leave a new stain for someone else to see! right at that moment I heard the door open!! someone had come in the bathroom! they walked to a urinal right in front of me and unzipped, I shot my load right there behind them! I sat back down and admired my cum as it slowly dripped it's way down the door right next to the other one. I began using that stall every time a had to use the bathroom. More to cum!