As a sadistic Master, her humiliation of being slapped and pissed in her mouth was OK. But I believe in harsh corporal punishment - strip the bitch completely naked, including her bare feet, string her up by her wrists. Spread her legs wide, forcing her to teeter on wooden blocks using only her 2 big toes to maintain her balance. Then use the cattle prod on her armpits, tits, cunt, asshole and soles of her feet! Put the fear of God in the bitch. Then piss on her face! Master William