Hika Ryoujoku: Wana ni Hamatta Futari / Hika Ryoujoku: Thirst for Vice

After Shinichi-kun's father decided to remarry, he got a stepsister named Megumi. She immediately accepted him as her older brother, but Shinichi himself rejected her and stopped communicating with his father. However, soon anger turned to mercy, and our hero fell head over heels in love with Megu-chan. He begins to desire her and acts like an experienced stalker, harassing her when she sleeps. Soon Shinichi-kun gets into trouble and is taken hostage by a group of hardened hooligans, who demand sex with Megumi as ransom. The kind-hearted new sister simply could not refuse the opportunity to help her brother...

 Hentai is based on the manga of the same name by Hazuki Kaoru.