Mona was happily farting in the face of Ashley since the flatulent mage found the other witch wandering around in the hallway. "Oh goodness; I'm feeling really stinky today. Probably wasn't a good idea to get into contact with my rear-"
"I've dealt with worse." Ashley spoke for she felt her stomach grumble and proceeded to unleash a huge purple fart cloud powered by her dark magic.
"M-my stars!" Mona exclaimed for she pooped her pants in surprise. "That's much bigger than I anticipated from a little girl like you!"
"Well you know what they say about size..."
"Indeed. Would you like to fart bum to rump?"
"...I might as well."
So Mona and Ashley placed both of their witchcraft brewing rears together and started letting out the most rancid scented flatulence they could muster for the hallway was filled with the echos of their loud deep pitched methane.