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Due to her parents remarriage at an advanced age, a gal suddenly became her sister-in-law. Naturally, he didn't get along well with me, a shut-in and a NEET, and he looked down on me, which made me resent him. One day, when my parents went on a trip for 2 nights and 3 days, I gave my younger sister sleeping pills and raped her. From that day until her parents come back, she is thoroughly confined and trained. I trained him until he obeyed me.