School Girl Shows Her Buttcrack Unaware

Watch in class non school uniform im so exited, but the boys behind me keep laughing, i turn around and ask them whats so funny.. They keep asking me if its breezy and if im cold, i explain its so hott and show them the sweat on my head how could it be breezy were in a heatwave.. I bend over and open the class window and sit back down and they keep saying im cracking them up, have a cracking christmas.. I m confused its months till christmas why do they keep saying silly things... They ask me if my jeans are to small, i explain they fit perfectly and then they say nice crack...... I look confused anhd soon realise my butt crack is on full show i pull my jeans up and sit back down andx its on show again im so embarassed. I tell the teacher and leave for lunch