I was about 23 and belonged to a gym at the local country club. I worked shifts and so went when it was quiet during the day. I liked it as I would wear my blue lycra shorts in the weight room and then my speedos in the pool.
One day I was in the weight room on the machine where you sit down and push the handles away from you to excercise your pecs. The gym was empty until a guy came in. He was a bit older than me, maybe 30 (oh how time flies!) and was slim and toned. To my delight he was wearing green lycra SUB branded shorts and a vest. We exchanged the obligatory "hi" and he went over to the big bench press.
His back was to me but I could glance at the mirror in front of him as I was behind him and to the left, and I had a good view of his front in the mirror. He certainly had a nice bulge in that green lycra! I carried on and he started warming up with the bar above his head, slowly squatting down. I could feel my cock starting to wake up and stretch my own lycra. I looked at his pert arse and to my delight I could make out the outline of a thong as he squatted down stretching his quads. I stole glances in the mirror as I didn't want him to see me staring at him. I was sure he was starting to get a bit of a semi as the bulge in his green lycra shorts definately seemed to be growing.
I now realised I had a full hardon and I became quite self conscious. I realised as soon as I stood up it was going to be very obvious and some quick adjustment would be needed! I also realised I was spending a bit too long on this one machine! I had a dimema as I wanted to see him do his full work out, on the other hand I was in danger of creaming myself if his bulge got and bigger and sweatier.
I stood up and turned away slightly in order to adjust my hardon to 12 o'clock. I had to walk past him to get out. I was sure my bulge was now obvious despite my t-shirt. As I walked past him he bent down to pick up his towel giving me a full view of his arse which with sweat was now giving a nice thong VPL. I made my way to the changing rooms, where I had to use a cubicle to relieve my tension before putting on my Speedo and getting in the pool!