Come into my bathroom and look at my dirty toilet.  Unacceptable!  I want you to clean it for me with your tongue.  I know it's gross and moldy so I will give you a reward if you do exactly as I say.  I bring you the camera deep into my toilet to give you a good POV perspective of your slave duties and exactly what you are licking.  Be a good boy and your happy ending will be me pissing on your face. Up for the challenge?