Stepmother Farting to wake up stepson FULL

My stepson is so late for college and I get so angry with him. I start farting loud to wake him up and make sure we won’t miss class. I know my farts make him horny so I do that on purpose while he is in the room next to mine. After some time, he left home for college and now I can finally fart freely. I start to do some noisy, loud farts thinking no one is home to hear it. But I hear a strange noise under my bed and I discover out that my stepson is under the bed masturbating to all my farts. I continue to fart to keep him jerking off for me until he cums.