Here's my story:
I live in the northwest and it rarely snows in my area. When it does, nobody is prepared for it. We got enough snow that most businesses were closed and most people didn't have to work. I was stuck at my sister's house for several days doing basically nothing. I couldn't masterbate in her house because it made me feel uncomfortable.
After the snow thawed and it was pretty safe to drive, I decided to go to the store. I needed to get underwear 'cause I couldn't go home to get more and I ran out of clean ones. Well, looking at the guys on the pictures got me horny and I hadn't masterbated in a long time, so I was getting kinda hard.
I bought my underwear and newspaper and went to the bathroom. I briefly saw a guy go in before me. He was tall and had a shaved head. I went into the stall and just sat there. I wasn't planning on doing anything, but as I sat there and saw his feet from underneath, it got me really, really horny. His shoe size must have been at least 14. I just imagined that he had a big dick to match.
It was really cold, so I had a ski jacket on. I started to masterbate and it was loud with the arm of my ski jacket rubbing against itself, but that just made me even more horny knowing that he knew what I was doing. I started really getting into it, faster and faster. I stretched out my legs in front of me so he really knew what I was doing, if he didn't already. Just then somebody came in. I stopped and pulled my legs back in. He left and I went at it again. Then another person came in and went into the stall at the very end (three stalls total; I was closest to the door). After he got situated, I said, 'Screw it,' stood up, turned around facing the wall and started stroking. I don't know how loud I was and I didn't care. I was really close to coming and went faster and faster. I heard a grunt coming from the stall next to me, the guy with the big feet, and that's when I came. I came onto the paper seat cover and you could hear the come squirting onto it. After a few loads, I wiped up and left. That was one of the best masterbation sessions EVER.
I wanted to wait outside the hall to see who it was, but I was a little embarrassed so I just went home. I still think about that and masterbate. Whenever I'm in that area, I look at guy's shoes to see if I can find him again. I know exactly what they look like.