Cwm Pooping Striped Briefs Pooping

Im wearing a pair of blue striped briefs and I need to poo. Im facing away from you so you can see my butt, waiting for the next wave of belly cramps to hit me. I feel my tummy start to cramp so I start to push. The back of my briefs bulge as soft, warm shit explodes out of me. I reach round and feel the bulge, cupping it in my hand for a moment before I squash it against me. I get really messy as poop spreads through my briefs, smearing all over my ass before pulling down my briefs and showing you my dirty, shit covered .