school days me and my girlfriend meet up in the 3rd floor girls bathroom to make out. That's the only free period we have together. the girls bathroom is always shut closed but with a push it opens. the day before winter vacation we headed up there. once after i closed the door, i realized that there was a black see thru thong on the floor near a locked stall. my girl whispered to me that she heard moaning so we went closer to hear and there was a hot latina looking girl having sex with a guy. as they were having sex we were making out. so unlike any other day my girl told me she was really horny and that she wanted me to finger her. minutes later we heard the guy fighting with the girl n den juss leave angry. my girl was turned on and was finally ready for sex so she left after the guy to get a condom from the nurse's office. as this time the girl realized that she wasnt alone. as she grabbed her thong and covered her pussy area, she yelled that she was about to cum but just then her bf left. i was already in the mood so i got closer to her and started fingering her. we had sex and she had a nice orgasm. just as we finished  she got her clothes on and my girl came jumping on me and we started. the other girl left and after a little while me and my girl finished. as we were about to leave she asked me wat i did alone wit the girl while she was gone and i told her , I just helped her out with her problem.