tricked into hogtied fart punishment

Description: Your innocent female housemate finds your ankle and wrist restraints. she curiously asks you to show her what they are. you put them on and explain to her what they are used for. once you’re completely hogtied, she confesses she’s not so innocent. you are going to be punishment. she slips her ass under you trapping your face between her ass cheeks and begins farting, making you breathe then all in. but why is she doing this?