Amy pulls her underwear up, forcing a wedgie, and also you, to slide deeper into her buttcrack.
you gasp for air as your face presses up against her asshole, the puckering rough skin opening around your face, as if it is trying to eat your head.
Amy moans in delight, and sits down, forcing your head into her ass, th smll is rancid, and you can hear the sloshing of her faeces somewhere close to you. the ass is wet, and big, there's a slight amount of light in here, and your dragged deeper in, as Amy rubs her ass against whatever she is sitting on, smooshing you deeper into to the smelly and dark orifice.
deeper and deeper you slide, now waist deep in your sisters asshole, you can hear a bubbling sound, and you know that she needs to go to the toilet soon, also worrying that she may need to fart.
"Oh, i'm enjoying this, Bro" Amy moans, pressing down harder, and pushing you up into her, now up to your knees. "enjoying this quite a *moan* lot.
after what seems like forever, your feet slip into the disgusting hole, and you realise morbidly that you're now trapped in the confides of your sisters colon..
"Now brother, i needto do one of two things. Fart, and Shit. whic one do you think it's going to be?" *giggle*