Looking up, you see your little sister's butt hole, wide open with a small piece of poo dangling on it. Right then you hear another rumble above you and Lexi's anus starts to quiver, the sight and the thought of Lexi pooping on you scaring you to death. Suddenly, the glass prison is filled with the sound of a fart once more, the smell nearly choking you. However, you feel relieved, that your little sister didn't actually do what you thought she was going to do. Then, your prison is filled with the sound of another fart, smelling even worse, the sound quickly turned wet and right as it stopped, you opened your eyes once more to look at the hole above you, the abyss of Lexi's butt hole spreading fast as a semi solid sludge was pushed right on top of you with the sickly sound of wet farts echoing in your chamber. The sludge covering your being as you lose consciousness.
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Lexi was having a real blast, finding her big brother so small, she decided she could play with him. She always loved playing with her brother, but he was getting older, and playing with the little sister didn't sound too funny to him no more lately, as he was spending less and less time with her. When she found her brother small like that, she was filled with joy, starting to imagine the things she wanted to play with him. Then a thought crossed her mind, she wanted to went the disappointment she had in her brother for not enjoying spending time with her anymore, she decided to try this out, trying to scare him a bit as well while doing so. So she said, "As punishment, you get to be the first person to test my home made 'gas chamber'!", trying to sound as scary as she could, dropped her brother in the glass in her hand, putting it down on the ground, she removed her skirt and pulled her panties down, turning over and squatting over the glass, she placed her butt hole on the opening and started to fart.
The first fart wasn't that big. But she wasn't done yet. She wanted to tease her brother more, so, still feeling a bit gassy, she pushed a few more farts. Just as she thought she was done, she looked in to the glass to, to her brother, who didn't notice her gaze as he was busy looking up at her bum. Right then, Lexi heard her stomach rumble loudly, she giggled to herself and thought, "Ah this fart is going to be awesome!". With that in her mind, she relaxed the muscles of her lower body, a fart immediately escaping her little butt hole. Feeling another one crawling its way down there to be released, she forced herself and let the last one out. What she didn't expect was, just as she finished farting, her anus suddenly opened up and she felt some warm and mushy sensation pouring down her anus, her stomach making sick noises in the process. Dumbfounded, she was not able to move as the sludge, with a very wet fart, stopped pouring, the mushy sensation in her anus disappearing. She slowly turned her head down to look at the glass between her legs, under her butt, she had to hold back the urge she felt to scream. The glass was filled nearly to the brim with mushy brown sludge, her poop, as was obvious from the smell and where it came from, she grabbed the glass. Feeling her eyes watering, Lexi quickly run to the bathroom and opened the closed pouring the sludge to the toilet bowl, leaning in she called for her brother, her voice ragged and scared. She only wanted to tease her brother, not to go ahead and poop on him.
Scared for her brother's well being, Lexi started to look through the sludge using her hands all the while calling for her brother, her voice becoming more weak every passing second. When she nearly lost hope, she suddenly saw a hand sticking out from a piece of, relatively solid piece of crap. Grabbing the hand, Lexi pulled out the very still and inanimate body of her brother. Lost in complete blankness, Lexi looked at the painful look on her brothers face, as tears started to run down her cheeks, she couldn't control her voice and let loose her screams as she began crying wildly.
"I am sorry brother. This was not what I wanted! I am sorry! I am sorry! I am sorry...".