Ensnared by Fart Sorcery

Your step sister is a dominant and magical individual with a peculiar and dark power. She has a twisted sense of control, forcing you to sniff her panties, farts, and ass under the threat of transforming your body into panties. Once transformed, she wears you and subjects you to her farts until you comply with her demands. She also has the ability to permanently attach people to her ass if they refuse her, and she enjoys squeezing people between her ass cheeks, clapping them into a pair of panties, and wearing them until they expire.