You are supposed to be at school but instead you come home to perv on your step sister, who you know will be out in the backyard sunbathing nude. Instead of going back inside you just stand there staring at her.  It's completely inappropriate that you are perving on your step sister, especially when she is naked and was supposed to be the only one home. Annoyingly you won't go away so your step sister has an idea... she will let you stay outside with her and not tell the parents, if you agree to be her puppy and do whatever she tells you to do.  After all, she thinks you're acting like one as you just stare at her like a puppy would. Now get down on all fours!  Now you look more like a puppy and you're even starting to pant like one. To further humiliate you for perving on her naked, she tells you to start licking up the sweat on her body, by starting with the sweat on her feet and don't forget to get in between her toes.  She is starting to like you better, now that you're her puppy.  So much so that she plans to get a collar and leash for you and continue this new dynamic beyond today.  Now it's time to start licking the sweat from other parts of her body. Focus on her legs and work your way up, and make sure to lick clean every crevice on her body...