Don't touch my little sister (woman)! Kawane Kurumi

What's wrong with incest? Love for little sister x jealousy = a desire to bondage filled with desire for domination. I have a younger sister who is older than me. I love my sister more than anyone else, more than anyone else. I'm sure Kurumi will be the same!! But as a shy person, I can't express my feelings directly. I'm so craving the walnuts that I own. A walnut that will stay with you forever...