buttcrack at highschool

When I was in high school, I often went to the library with my girlfriend. Once, I was wearing low-rise jeans and a t-shirt that came down to my belly button. My girlfriend and I were looking for something we had to study in class. We started browsing the shelves until we found the book. I crouched down to pick it up But my jeans were sitting really low—ten inches of my butt crack were showing—though I wasn't really aware of it. My friend started laughing when she saw my butt crack exposed; I asked her what she was laughing at, and she said, "Nothing." I stood back up—still with my butt exposed—but then I dropped the book. I squatted down again to pick it up, exposing my entire backside in the process; my friend was trying hard not to laugh. Then, the librarian suddenly appeared behind me and saw my whole butt crack exposed. She tapped me on the shoulder and told me what I was doing was disgusting and that I needed to pull my pants up immediately. I was obviously very embarrassed by the situation; I pulled my pants up a bit and apologized. Afterward, my friend and I sat back down on some chairs, though my butt crack was still visible.