Stepbrother used as full toilet

I really have to use the toilet so hard, but my step-brother 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-sister? 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.