*PFFT* *FRAAAP* *POOT* *BLAT* *THPPTPHTPHPHHPH* *BRAAAP* *BRAAAACK* *FRRRT* *BLAAARP* *PBBBBT*

Out of nowhere, a triple dutch oven blew over you on all side from their anuses. Generating this hot humid air pressurize hard as a jet engine. With the smell so nightmarishly foul it might as well be poison, a concoction of protein and fiber that would create the biggest of gas. The smell practically burns your lungs out with a single whiff and throwing off your sense of balance. You felt sick as you cough, horrified by the disgusting smell burning your everything, your eyes water, the wet farts sprayed onto your body making it sticky.

*BRAAAP* *BRAAAACK* *FRRRT* *BLAAARP* *PBBBBT*

Another blast came out, this time much louder and even more nasty. The constant blasts the sisters made created this gas chamber lined by their butts to prevent the gas to dissipate, unfortunately your escape. 

You try to scream and shout to get them to stop, to get you out of their enormous glutes as it keep gassing you over and over. The wall of ass however muffled your voice, instead you could still hear the chatter of the sisters.

"Damn. That was nasty." Olga was the first to comment. "Knew I was gonna let it out. Heh, felt them begging a bit in there."

"Yeah no shit." Olav replied, "No one usually survives getting gas directly from your ass, let alone by all of us."

"Uh, maybe we should stop, it was funny at first." Onna said, which you took with great concern at her comment. "I don't think they'd last anymore if we kept them in longer."

Olga thought about it... Long and hard before she decided...