You’ve been caught getting dirty with your Mistresses panties, & your bad dick needs to be punished. Lots & lots of her slapping it back & forth, up & down, with her hand. Spitting on it ( maybe saying that this is the only way you’ll ever get your dick wet ). Rubbing her panties on it really fast & aggressive, like she’s trying to give you fabric burn ( maybe saying this is the only way your dick will ever smell like pussy ). And smacking it for being bad until she jerks you off onto her panties.
