https://www.dlsite.com/maniax/work/=/product_id/RJ01433463.html

I live with my brother and his beautiful wife, Miyuki. Every day, I'm surrounded by her alluring presence, and my heart is constantly filled with desire. One day, I accidentally discovered Miyuki's secret. To have her, I used her secret to blackmail her. This relationship, which began with blackmail, transformed her into a slave to my desires, and while wearing the mask of "family," we commit sins every day without my brother's knowledge…​

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