With a wet sucking sound, your feet and lower legs get sucked into Heather's anus, which closes tightly around them, making it impossible to move. She slips her panties on, forcing the lower half of your body into the crack of her humongous round ass as the other girls giggle at the Brian-shaped lump in the back of her thin panties.
"Hey- listen," says Heather, and the other girls become quiet. After a second of silence, Heather lets go a of small fart- small to her, at least, although to someone your size it's an explosion of hot, smelly air. As her anus closes back up, it draws you in a little further- you're now in past your knees. Heather notices this as well, saying, "Hey, I think he went in more!"
"Really?" says a voice you think is Amanda's. "Do it again!"
"Yeah," says Heather, and lets out another fart, pulling you in to your waist.
"Haha, I saw it! He's going in!" says Ciara's voice. A hand that could be anyone's gropes Natalie's butt and feels your body through the fabric of her panties.
"OK, here comes the big one," says Heather. You hear her stomach gurgling as gases move around inside her, and finally she seems ready. You brace your hands on the inner part of Heather's asscrack in order to pull yourself out when her asshole opens again for the next fart.
The next one really is the big one- if you weren't held so tightly, the blast of hot fart might have been enough to blow you away entirely. You start to pull yourself out, but ass her anus closes again you realize you're no match for those muscles. You're drawn in again, this time all the way to your armpits.
"Well," says Heather, obviously disappointed, "I'm all out."
"Aww," say the assembled girls.
"So what are you going to do now?" asks Ciara.