During finals, when I was studying hard in the library, there was one bathroom where you could always find some peace and quiet to jerk off. Just to relieve stress. It was hard to find time or space in the dorms, so I would often walk to the bottom floor, in the far back of the building, and settle into the stall for a nice long slow stroke session.
One day I found my usual stall occupied so I took the only other one, which shared a divider that left about 12 inches of space open under it. I took my seat, and noticed when I glanced under the divider that the light in the room was directly above that stall, and it cast shadows that fell in such a way that you could clearly see his hand moving with his cock between his legs by watching the shadows on the floor. Within a few minutes his pace quickened, and spurts of hot cum went across the stall, hit the door, and dripped down to the floor. He wiped off in a flash, pulled up his pants and left the bathroom without even washing his hands!
I took a risk, and -- with my pants still down around my ankles -- shuffled out of the stall and into the one he had just vacated. The seat was still warm, and there was cum on the inside of the divider still slowly oozing down to the floor. It smelled great! It made me even hornier than usual, so I took some of his cum off the wall and used it to lube up my now hard and throbbing dick. It felt amazing.
I decided to switch back to my other stall, and at that moment a very loud ventilation van system started up, and I couldn't tell if the bathroom was empty or not. So, I stood up on my toilet seat to peek over the divider and see if there were any others in the restroom. I would have been embarrassed to shuffle back across the floor with my hard on covered in spunk while someone was walking right towards me as they entered the room! And it's good I checked because just as I looked over the divider, the door opened and someone entered. I ducked back down, but kept my position standing on the toilet seat. I realized that if they looked under the divider, they'd see no feet, and think it was empty. The fan noise was still so loud that it covered any sounds I might make at all.
I leaned back against the wall far enough that whoever had entered wouldn't see my shadow cast on the stall's floor, and just then I heard a urinal flushing, so I assumed the guy who had entered had used the urinal and was finished. I waited a bit to hear the door open and close, and sure enough, he was gone.
I stood there, relaxed a little and started stroking again my now semi-erect cock still covered with cum from the previous occupant. It was amazing! I was just getting back to a full hard on when the door opened again. I stood still, and waited until I heard the stall door next to mine open and close. I saw a small shadow form on the floor as I realized whoever had entered was checking to see if he was alone. And by all appearances, he was! Since I was still standing on the toilet seat and I knew the guy next to me was sitting, I snuck a peek over the divider. It was guy I'd seen around campus, but didn't know well. he looked like a wrestler, short stocky, built and with a buzz cut. He was wearing jeans and a t-shirt with red converse sneakers. He was leaning forward, looking under the divider, and pulling happily on his cock. He never imagined I was above him watching, as he obviously needed the stress-relief as badly as I did.
Sensing he was alone, he rapidly relaxed, sat straight up, began beating his meat, and making moaning noises, mostly masked by the loud fan sound. He was giving me quite a show. I stroked my now-throbbing cock to match his, which I could see was smaller than mine, but his dick head was fat and purple like a mushroom, and he kept spitting on his hand to lubricate himself. I pumped myself faster and faster and had the most exhilarating orgasm, with my cum hitting the divider between us, and slipping down to the floor. But he wasn't paying attention at all! My hands were all covered in the previous guy's cum plus my own, and it was really sticky, but I didn't wipe it off.
Just as I sensed he was about to cum, he leaned way back and looked almost into my face, but his eyes were closed in ecstasy, so it only gave me a huge scare. Still, I reflexively ducked back over to my side of the divider just as he came, so I missed it, but I could hear him moaning, and pumping over the fan noise for a full minute! He sat there a while afterwards, and eventually I got up the nerve to look over the wall again. He was wiping off the cum with toilet paper, and some of it was on the walls! I saw him reach back to flush, so I ducked back down.
I stayed put up there on the toilet seat until I heard him leave. Then I sat down and took some deep breaths. I shuffled back out of the stall to the next one and found a few spots where he hadn't wiped all his cum off the walls. I wiped some of it off, mingling the three cums together and tasted it. The best cum cocktail ever!
I love to go to that bathroom often, and I wonder what the janitor thinks when they have to scrub those walls!