NKKD-126 A record of non-stop sex with my kind sister-in-law during my serious brother's two-night, three-day business trip. Sakusakihara Rin

I'm a serious worker's little brother, living like a freeloader in my brother and sister-in-law's apartment. Though I told myself that this year I had to pass the exams, I harbored indecent feelings for my kind and beautiful sister-in-law. One day, my brother went on a two-night, three-day business trip. 72 hours alone with my sister-in-law. Unable to hold back any longer, I spent the three days my brother was away having sex with her, not even sparing time for sleep.