Panty pooping girl

Its Emma again. I haven't posted on here for a while but I'm back now.

I was walking home from school on Friday and I'd been holding it all day even though I was busting to go. By the middle of the afternoon I was getting desperate but I wanted to wait until I got home from rather than go at school. I kept fidgeting around in my seat during history and the teacher asked me if I needed to go to the toilet which was embarrassing. I said I was fine but the truth was that I was desperate for a poo. I tried to keep still so as not draw any more attention to myself but it wasn't easy seeing as I was about to poo myself. By the end of the day I could hardly move in case I had an accident in my knickers so I waited until everyone else had left the classroom before I got up from my seat. I clenched hard and just about managed to get up without losing control and walked slowly and carefully out of the room. I thought about going to the toilet before I left school but being a stubborn I decided to wait until I got home. The walk home from school was a challenge and the thought of doing it in my knickers scared and excited me and I secretly wanted to have an accident but I couldn't let that happen in public. I got about half way home when I felt a cramp in my stomach and I felt my bowels trying to push against my will. I clenched hard and just about managed to keep control but it wasn't easy. My heart raced in excitement at the thought of using my underwear as a toilet and I couldn't resist the temptation to relax. As soon as I did I felt my poo coming out into my knickers and it felt so good I didn't try to stop it. I peed myself as well and when my pee stopped I was still pooping. I totally filled my knickers and bits of it were falling onto the pathway. It was a big relief and I was horny as hell so when I got home I masturbated before I cleaned up and I had a fantastic orgasm and I got my fingers covered in poo.