I left my zipper down in class today for the full 2 and a half hour class time for the s***** thrill. I made the zipper halves gape apart and folded the inner flap of my fly out of view, exposing a considerable surface area of my boxers and bulge. The girls sitting on either side of me noticed as soon as class started (because how could you not) and said nothing to me, believing that I was helplessly oblivious. The girl to my left was terribly indiscreet about her gawking– literally cocking her head to the side one point while she stared. She looked away whenever I caught her staring, trying to keep me unaware I guess, and even worked up the nerve to take pictures of my crotch halfway in to class. The other girl was much more self-aware, but just as mischievous. She whispered to her friend sitting on the other side of her, letting her know about my ‘compromised’ position I suspect, and leaned far back in her chair at one point to give her a good view. Needless to say, I spent my time warding off an erection and acting oblivious. I want to do it again but I’m afraid twice will be too suspicious. I don’t have another class where I’m surrounded by girls so this was probably a once in a lifetime opportunity.