Slave wife, I want to please you...

Mr. and Mrs. Yamamoto are on good terms as husband and wife and are living a happy life. On the surface, they look like any other ordinary couple...However, at night, they are a "master" and a "slave." His wife, Miwako, felt love from her husband through humiliating sexual acts and thought she could do anything for him. One day, Miwako received a sudden proposal from her husband. "I want you to test if your love for me is real! Can you promise me that you won't cum even if you have sex with someone other than me?"