My father remarried and I got a new mother. Unlike my previous mother, Yuriko was beautiful and had an amazing figure, but I couldn't accept her as my mother. One day, Yuriko started studying to get a qualification in oil esthetics and asked me to be her practice partner. Yuriko straddled me while I was lying on my back wearing paper panties and started to apply oil. When her skirt flipped up, her oiled buttocks were right in front of me...