I Am A Girl Who Sags Her Pants Low

My friend who sags her jeans:

I was on a bouncy castle with some of my friends and one of my friends jeans kept coming down. The first time, she knelt and they fell about 2 inches down. The second time, a friend had pushed her for a joke and she bounced off an inflatable bumper and landed on me with her jeans halfway down her thighs, her bright white panties with multicoloured dots were exposed to everyone on there. As nice as it was, I felt really sorry for her.