Several years ago I was staying at a private club in New York City on business. Lots of good looking guys around the bar, and I was enjoying watching them and daydreaming. I was getting horny when I remembered that there was a gym on the fourth floor. I was feeling bold, so I went up in the elevator and looked around the locker room.
A group of young guys were there, saying goodbye to a buddy who was still in the shower. As they left, I looked over at the shower stall and could see the guy's cock, it wasn't real big, but he had a nice blonde bush and I started to get a boner right away. Then I noticed that his clothes were lying on the bench near the shower stall, and his white jockey shorts were right on top.
My stomach started to do flip flops as I walked over, keeping an eye on him. Luckily, he turned around to wash off his face, and while I stared at his blonde ass cheeks I reached out and grabbed his underwear, and stuck it in my suit coat pocket.
I turned and almost ran back to the elevator. My jacket pocket was bulging with his shorts, and my suit pants were bulging with a huge boner. Luckily, no one was waiting for the elevator, so I stuck my hand in my pocket and pulled my cock straight up and held it tight, trying to hide what must have been a pretty obvious erection.
Luckily, I was so scared that I started to get soft, I sat in the lounge for a few minutes, but knowing I had that guy's underwear was too much for me, so I headed back up to my room.
The minute I got there I dropped my pants and whipped out my cock in front of the full length mirror on the bathroom door. I wrapped my boner in the guy's shorts and started jerking off with them. I was imagining him getting out of the shower and finding his shorts gone and having to go back to his room freeballing.
I kicked off my shoes, threw off my jacket and dropped my boxers. I was standing there wearing just a shirt and tie, with my jockey-wrapped hardon sticking out between my shirt tails. I decided I had to put on that guy's underwear, so I stepped into them. Luckily, there were a size or two larger than what I wear, so I could get my boner into them. Looking at myself in the mirror, wearing that guy's jockey shorts proved too much, and as I twisted them around my cock I started to let loose with load after load of cum, right into the shorts. I rubbed the wet shorts up and down the length of cock and over my balls until I was covered with my cum and his underwear was totally soaked.
When I woke up the next morning, I jerked off into his pants again. I still get them out of my dresser once in a while and have a go at it. I wonder if it turned him on to think about what the guy who stole his underwear did with them.