Ichizu ni Zettai Fukujuu na Imouto o Mechakucha ni Shitemita ~Aiyoku Kyoudai~

One day, I made a big mistake at my part-time job, took the blame, and got fired. --If I indulge in sex, I feel like I can release the heavy feelings I'm feeling. I always do this, approaching women who seem like they won't leave any hard feelings behind. Taking advantage of a passing encounter, I've even shattered their dignity and brutally beaten them. I felt a sense of relief when I pinned down a nameless woman, crying in pleasure and shame. ...But something was missing... --My feet automatically led me to the bathroom where my sister was. ...She's my sister, so it's probably not right no matter what. ...But once my desire is ignited, there's no stopping it. Feeling an unbearable heat inside me, I stripped off my clothes and entered the bathroom where my sister was. "Brother?! No, no...! What are you doing...?!" Ignoring her screams, I closed the bathroom door behind me. Then, as if trying to shake off the indescribable frustration and guilt I felt about what I was about to do, I exposed my erection.