QX-189 - Slave Training: Shoko Ienaga

As the title suggests, this is a very classic SM work. It's not just about the pleasure of being stepped on, but a story of psychological domination leading to pleasure, so there are no painful scenes. A man she trusted turns out to be a masochist, and she gets double-trained by a queen. Although she resists at first, she quickly drowns in SM pleasure.