My parents remarried and I had a reclusive stepbrother who is a sex monster! My stepbrother masturbates every day and even rummages through my step sister's underwear. Seeing this, my step sister fears that he might attack her Itsuka. She gives her friends and teachers who come to visit her house drinks laced with sleeping pills, puts them to sleep, and offers them to my stepbrother in her place, in an attempt to release his sexual desire! He attacks the sleeping woman and makes her cum over and over again with his endless continuous penetration, making her feel pleasure whether she's asleep or awake! My step sister feels relieved, but one day she is left alone with her stepbrother...