The race begins and you are all shocked to see Mark shoot ahead of you all. You pick up speed, too, hoping to out run him, but it was too late. He rushed across the finish line and waited for the four of you to finish. However, as you began trying to catch your breath, you began feeling slightly uncomfortable in your clothes. It turned into a light itch everywhere, and nothing pleased it.
The longer it went on, the worse it felt, until it was like a massive spider bite all over your body, the mix of a burning sensation and a very bad it. Finally, you began pulling your clothes off, realizing that each article of clothing made it feel better. Finally having removed your underwear, the sensation was gone.
It was then that you realized that the other girls were naked too. The obvious bulge in Mark's jogging shorts told you how much he liked this.