frisky-gains answered:
*Frisk’s stomach was back to it’s typical groaning and sloshing, Muffet screaming inside with frustration.* “Let me go you brat! I’m not some snack for a fat idiot like you!” *Frisk rubbed their underbelly with a satisfied look.* “URRAAAAAAAPPPPP you sort of are now!~” *Frisk slowly pushed onto their stomach, hoping to force more of Muffet’s air out.* “BERRRRRRRRURRRRRRRRRRRERRTTTTT!” *The gas escaping their rear blew out like a tornado, their stomach rapidly shrinking as it did.* “Oops…too much?~”