MissMortelle - Used my Step-Bro as Full Toilet

I really have to use the toilet so hard, but my step-bro is using it. In the end I can´t hold it anymore and go into the bathroom. There I see him jerking off, while sniffing my panties and watching porn! How could he steal the panties of his own step-sis? I fight for his phone and then I see what porn he was watching: Women shitting on men! How disgusting can my own family be? Then I realize that I have something against him now and might have a little bit of fun at least... I tell him that I really need to use the toilet, but that he is blocking it. I start undressing and push my ass into his face. I know that he is enjoying it, even though it is humiliating that his own step-sis is doing this to him. Then I make him lie down into the bathtub and piss right into his mouth, looking closely that he is drinking it all up like a good toilet. Then I stand over him and tell him to open his mouth. He will taste the shit of his step-sis and swallow it all!...