"My sister and I have become your pets, big brother." Sisters Reina and Aina fall in love with their stepbrother Shota, but at the same time, they are thoroughly trained by him.
The sisters are completely corrupted by him as he indulges in perverse play wherever they are... but one day Aina receives a love letter from another boy, and Shota becomes interested in another woman... will the sisters' training relationship fall apart?
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