It would be a bitchy big step-sister facesitting clip. Basically, you decide to punish your little step-brother for ratting you out to your step-parents, and sitting on his face and making him pass out is your favorite punishment. It would have a size humiliation element to it, where he is too scrawny and weak to get you off of him and every now and then, just threaten the fart on his face. In the end, you finish him off by sitting on him one last time.