I went to the gym for cardio today and accidentally wore underwear that was a little too tight in the crotch. Normally, this isn't an issue, but with jogging on the treadmill or pedaling on an stationary bike caused the tip of my penis to rub against the seam of my underwear with every move. So, I spent the entire hour or so I was at the gym on the verge of cumming in my shorts in front of everyone.