Imagine that your step sister discovering that you’re cheating on your girlfriend. Now you’ll have to do what ever the fuck she wants for her to not tell your GF about it. Will you go along with it? Or will you tell her to fuck off and have your girlfriend dump you? It’s all up to you. You have the power to progress the story whichever direction you want. Along the way you might even get a chance to fuck your step sister. But of course only if you play your cards right. Good luck!!!