STARS-952 While the parents were away, a NEET brother raped, imprisoned, and thoroughly subjugated his clingy stepsister. Yuna Kokura

Due to my parents' remarriage at an advanced age, I suddenly became the brother of a gal. As a hikikomori and NEET, it's natural that we don't get along, and she treats me with a condescending attitude, fueling my resentment. One day, when my parents went on a 2-night, 3-day trip, I spiked my sister's drink with sleeping pills and raped her. From that day until my parents returned, I thoroughly imprisoned and trained her. I tamed her until she obeyed me.