Oh come on step-Brother, what do you mean my outfit is too slutty to leave the house in?? This is what I'm wearing to the Halloween party. Oh my god noooooo, please don't tell Mum and step-Dad, there is no way they would let me. Can't this just be our little secret, this one time?? What do I have to do to persuade you to see this between us, huh? I could urmmm... tidy your room for a week? No? Hmmm, ok well what did you have in mind? Oh my god, you want me to do what with my tits?!?! But I'm you're step-sister!! Ok fine, but keep this between the two of us ok, no one can ever find out....