I always work out at the local gym the last hour before closing, sometimes I'm alone an I find it perfect for training when I am.
A really hot guy have started to do the same probably of the same reason
The other day I noticed he didn't lock his locker when going to shower so I went to it and picked up the underwear he used when training. They smelt sooooooo good.
He had an extra pair, clean, so I used them for jerking. I sneaked up to the showers wathing him while sniffing and jerking. It was so hot.
I plan on doing that many more times.