A chaste Chinese wife is cruelly initiated into the world of BDSM by her own son, who sees her not as mother, but as a plaything. He binds her wrists tightly, forcing her to her knees, her body trembling with fear and excitement. He writes degrading words across her skin, marking her as his property, his bitch. She is made to perform humiliating acts, her body used for his pleasure, as she struggles to reconcile her new reality with her old life.