Those two words always make me horny. It always pertains to two things piss and poop. This story is about poop. I was in the seventh grade and had been using my underpants as a toilet more than one time during class. I seemed to be able to get excused each time telling the teacher that I really had to go number two. This particular day was going to be a memorable day because I would have some of the biggest mess of my life. So I left the classroom and headed upstairs to the third floor boys room next to the science labs. That toilet was hardly used as it was too far from most of the classrooms and diligent students didn’t want to be late to class. It was to my advantage to go in there…less bodies bothering me. I walked into the stall and locked it behind me. I dropped down my top pants which were corduroys and then I dropped down my underpants. Well I wanted to make sure not to call attention to me if someone did come in so if they looked under the stall as some curious boys do, I wanted it to look like everything was normal. Pants dropped, underpants dropped. I am pooping in the toilet….NOT! It would appear that way but I had worn two pairs of undies that day. I still had a pair on to poop in. I did my usual grunting and pushing on it until I had a load in my pants. I was now HAPPY and ready to masturbate. My penis was hard from doing the load so I really wanted to sit in it first. I pulled my clothes back up and on and left the boy’s room and headed for the first floor where all the hard seats were. The courtyard had cement seats that I could mash my shit all over myself and then whip out my thing and do it. Walking down 3 flights of stairs made this shit somewhat mashed together but I really mashed it when I went out in the secluded courtyard and sat down in all this soft big mess. It went everywhere…all over my rearend, part of my legs, and it covered every part of my undies. It stunk too! I was so excited and it felt so good. I whipped out my penis and began to masturbate. As the orgasm was about to climax I put my penis back in my undies and squirted all over the inside of them. That felt so good squirting in my pants. White, sticky goo cum was pushing up against my undies as I squirted super good. Doing something else in my pants! I wanted to show my classmates what I just did but instead I went to the nurse . That year in school I managed to get changed by one of my teachers. She liked boys and probably was molesting us. The nurse called her and soon I was face to face with her and I knew I was on my way with her to the secret room where she changed me the last time. I was an innocent boy and she knew that. Why she wanted to change me I think she had a fetish for poopy pants or something. Like my fetish for shit. She didn’t molest me but she changed me like I was her baby son. That felt so cool getting changed by my teacher. That secret room was stocked with clean clothing and not sure where all that came from but I was happy I had something clean to wear. After awhile the mess doesn’t feel that good anymore.