I was working out at the gym, when i got too tired so i went out the side door to cool off. Outside was probably hotter than inside even though it was 8:30pm. I saw stairs going down to a opened door leading into the pool hallway. I sat on the stairs letting the air condition blow over me. I was done my water already so i stood up and went to refill at the water fountain beside the door. On my way there, i passed through an open door. I only had my head turned for a split second, yet i saw treasure room. I instantly saw all over the room grocery bags, backpacks, and gym bags of clothes. I had a huge panty fetish so i knew i had to get in. I saw that no one was inside, so i headed in, and rifled through a clump of bags on the center bench. I removed a couple panties one from each. Then i snuck into one of the bathroom stalls. Since the pool closed at 9, in 5-10 minutes the girls piled in. I was wearing a pair of tight gstring panties that rode up my ass. I wathed as the group of teenage girls all around 17 were searching for their panties. I jerked off looking at hot bodies i came soon. Unloading all over the wall. I couldnt leave yet so i just kept on jerking off for 30 minutes till they all left. By that time the walls was dripping with cum.