MXGS-1164 My father remarried and I had to live with my new step-sister and the story that followed

My dad remarried and suddenly I had a JD sister-in-law. Unlike me, she's a serious woman with excellent grades, and she'll take care of my next exam, but in reality she's a sexually curious Mutsurisukebe. I give in first. sister-in-law's seduction. I can't do that and devour her body.