Be My Master

私の奴隷になりなさい 第2章 「ご主人様と呼ばせてください」

Also known as 做我的奴隶2, Watakushi no dorei ni narinasai dai ni sho go shujin-sama to yobasete kudasai, 请做我的奴隶2, 做我的奴隶 第2章：请叫我主人, Watakushi no dorei ni narinasai dai san sho o ma e shidai

A married ad designer (Meguro) is having an affair with a married woman (Ming). When an ad agency head visits Meguro, it's revealed that he's Ming's husband (Shanwei). Shanwei warns Meguro to not only continue the affair but also record (for Shanwei) and "mentor" Ming in a series of escalating sexual domination/humiliation rituals. If Meguro refuses, Shanwei will disclose the affair to everyone, including Meguro's wife.