Confinement Brainwashing: Trained by Stepbrother - Mari Takasugi

My brother-in-law is not related to me, but he is always kind to me and takes good care of me. One day, my parents went on a trip, and as soon as we were alone, my brother-in-law changed his mind. My brother-in-law's refracted love was directed at me. He confined me to my room and played with me. At first I resisted, but I was taken over by my devilish brother-in-law, and then I fell into his twisted love...