Transcendence AU Prompt: Dipper and Mabel discover that Dipper is allergic to something that is said to repel demons. They also discover that demon sneezes have weird side effects.
Mabel was in stitches. Her brother, the demon, was currently floating in the air, a foot above the table, sneezing his tophat off.
“What–CHOO–was in–HATCHOO–that soup?!” Dipper managed to say, between sneezes. Every time he sneezed, somehting in the room changed. Currently the table was alive and growling at Waddles, there were one too many bookshelves, and a photo of the Pines clan was changing colors.
“Um…nothing you’re allergic to!” Mabel said while giggling.
“Are–CHOO–you sure–HATCHOO–?!” Stan’s hat sprouted flowers and Mabel’s sweater turned into a leather jacket.
“Well not anything that I know…,” Mabel stifled another giggle. “There was pumpkin, thyme, sage–”
“MABEL–KACHOO–SAGE IS USED TO–CHOO–PURIFY PLACES AND–WATCHOO–DRIVE OUT–CHOO–DEMONS!” Gravity turned off, Dipper turned into a sheep, fire shot from Gomper’s mouth, and Stan’s mouth zipped shut.
“Oh…” She grinned goofily. “Whoops.”