Today I went to the gym. It’s the first time I went in a few years. I went to the gym that’s probably the most popular near my house. I’m 19 years old and fairly skinny, Except for my a**. I think my a** is big compared to the rest of my body. Although since I was in 8th girls always told me that I have the nicest a**. So perhaps it’s my best feature. Well the only underwear I wear are thongs and g strings. While I was working out I wore a g string. I went in the locker room after and the locker I chose was at the end of the hallway. There was good size crowd today so there were guys constantly walking around the locker room. As I was changing I had my a** facing the hallway. As soon as pulled down my pants to change I got so hard. I guess it was just the feeling of a bunch of random people having to see my g string. I wasn’t expecting it at all. I really just wanted to pull my c*** out and start jerking off. But I resisted the urge. I then took my g string off to change into my thong speedo to go in the pool. Now I wore regular swim trunks over the Speedo. I come back from swimming. And before I even take my suit off I got hard again. Just knowing the feeling that was about to come. So I’m standing there in my thong speedo with a hard a** c***. I really thought about walking all the way across the locker room to the bathroom and just j******* in the stall. But I resisted that urge to. I changed into my regular thong underwear and I got dressed and came home. Now I’m home and my c*** hard just from writing this. At least now I can do something about it