During a holiday break, I returned to my parents’ house and found my sister still living as a NEET. Frustrated, I lectured her about living off our family savings, but she ignored me and went back to her room. Impulsively, I attacked my sister. At first, she was taken aback, but once we started, she screamed uncontrollably and turned out to be an incredibly lustful woman. Over the next few days, my sister and I continued our deviant acts…