The house they moved to has few rooms, so the older sister and younger brother end up living in the same room. The younger brother is confused by his older sister's defenseless appearance. The younger brother's heart beats faster when he sees his sister's panties and her sleeping face. And when he peeked at his sister having sex with her boyfriend, the younger brother's sexual desire is awakened! He attacks his sleeping sister and engages in incestuous sex! The older sister was violated, but when she learns of her brother's feelings for her, she gradually becomes addicted to having sex with him...